Введение в LINQ

Составляющие LINQ
Автоматические свойства
Инициализаторы объектов и коллекций
Анонимные типы
Методы расширения
Лямбда-выражения

Автоматические свойства
private string _firstName;
public string firstName
{
get { return _firstName; }
set { _firstName = value; }
}

Автоматические свойства
private string _firstName;
public string firstName
{
get { return _firstName; }
set { _firstName = value; }
}
public string FirstName { get; set; }

Неявно типизированные
локальные переменные
var i = 5;
var s = "Hello";
var d = 1.0;
var numbers = new int[] { 1, 2, 3 };

Правила неявно типизированных локальных переменных
var x; // Ошибка
var y = {1, 2, 3}; // Ошибка
var z = null; // Ошибка
var не может использоваться в полях в области действия класса.
int i = (i = 20); // ОК
var i = (i = 20); // Ошибка
var a = 5, b = 10; // Ошибка
Если тип с именем var находится в области действия, то ключевое слово var будет преобразовано в это имя типа и не будет обрабатываться как часть неявно типизированного объявления локальной переменной.

Инициализаторы объектов
public class Car
{
public string VIN { get; set; }
public string Make { get; set; }
public string Model { get; set; }
public int Year { get; set; }
public string Color { get; set; }
}

Инициализаторы объектов
Car c = new Car();
c.VIN = "ABC123";
c.Make = "Ford";
c.Model = "F-250";
c.Year = 2000;

Инициализаторы объектов
Car c = new Car();
c.VIN = "ABC123";
c.Make = "Ford";
c.Model = "F-250";
c.Year = 2000;
Car c = new Car()
{
VIN = "ABC123",
Make = "Ford",
Model = "F-250",
Year = 2000
};

Инициализаторы коллекций
private List
GetCars()
{
return new List
{
new Car { VIN = "ABC123", Make = "Ford",
Model = "F-250", Year = 2000 },
new Car { VIN = "DEF123", Make = "BMW",
Model = "Z-3", Year = 2005 },
new Car { VIN = "ABC456", Make = "Audi",
Model = "TT", Year = 2008 },
new Car { VIN = "HIJ123", Make = "VW",
Model = "Bug", Year = 1956 },
new Car { VIN = "DEF456", Make = "Ford",
Model = "F-150", Year = 1998 }
};
}

Анонимные типы
var car = new { Make = "VW", Model = "Bug" };

Методы расширения
public static class MyExtensions
{
public static bool IsValidEmailAddress(this string s)
{ Regex regex = new Regex(@"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$");
return regex.IsMatch(s);
}
}
string s = "
[email protected]
";
bool result = s.IsValidEmailAddress();

Правила методов расширений
Метод расширения и класс, в котором он объявлен, должны быть статическими с модификатором public
Первый параметр определяет, с каким типом оперирует метод, и перед параметром идет модификатор this
Методы расширения не могут получить доступ к закрытым переменным типа, для расширения которого они используются
Методы расширения находятся в области действия, только если пространство имен было явно импортировано в исходный код с помощью директивы using
Методы расширения не могут переопределить методы класса

Анонимные методы
List
cars = GetCars();
List
filtered = new List
();
foreach (Car car in cars)
{
if (car.Year > 2000 && car.Model.StartsWith("F"))
{
filtered.Add(car);
}
}

Анонимные методы
List
cars = GetCars();
List
filtered = new List
();
foreach (Car car in cars)
{
if (FilterYear(car) && FilterModel(car))
{
filtered.Add(car);
}
}
public bool FilterYear(Car car) { return car.Year > 2000; }
public bool FilterModel(Car car) { return car.Model.StartsWith("F"); }

Анонимные методы
public delegate bool FilterPredicate(Car car);
public bool CheckPredicates(Car car, IList
predicates)
{
foreach (FilterPredicate p in predicates)
{
if (!p(car)) { return false; }
}
return true;
}

Анонимные методы
List
cars = GetCars();
List
predicates = new List
();
predicates.Add(delegate(Car car) { return car.Year > 2000; });
predicates.Add(delegate(Car car) { return car.Model.StartsWith("F"); });
List
filtered = new List
();
foreach (Car car in cars)
{
if (CheckPredicates(car, predicates)) { filtered.Add(car); }
}

Анонимные методы
List
cars = GetCars();
List
predicates = new List
();
predicates.Add ((Car car) => car.Year > 2000);
predicates.Add((Car car) => car.Model.StartsWith("F"));
List
filtered = new List
();
foreach (Car car in cars)
{
if (CheckPredicates(car, predicates)) { filtered.Add(car); }
}

Анонимные методы
List
cars = GetCars();
List
predicates = new List
();
predicates.Add (car => car.Year > 2000);
predicates.Add(car => car.Model.StartsWith("F"));
List
filtered = new List
();
foreach (Car car in cars)
{
if (CheckPredicates(car, predicates)) { filtered.Add(car); }
}

Лямбда-выражения
(string s) => { return s.Length; }
(s) => { return s.Length; }
() => {/* statement(s) */ }
(s) => { return s.Length; }
s => { return s.Length; }
(x,y) => { return x < y; }

Архитектура
C#
.NET Language Integrated Query (LINQ)
LINQ
to SQL
LINQ
to Objects
LINQ
to XML
LINQ
to Datasets
LINQ
to Entities
LINQ data source providers
ADO.NET support for LINQ

LINQ-примеры
(Query-синтаксис)
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};

LINQ-примеры
(Query-синтаксис)
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};
Источник данных

LINQ-примеры
(Query-синтаксис)
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};
Источник данных
Ссылка на сущность в
источнике данных

LINQ-примеры
(Query-синтаксис)
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};
Источник данных
Ссылка на сущность в
источнике данных
Фильтрация и
сортировка

LINQ-примеры
(Query-синтаксис)
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};
Источник данных
Ссылка на сущность в
источнике данных
Фильтрация и
сортировка
Преобразование
данных

Синтаксис
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};

Синтаксис
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};
Обязательное начало
запроса

Синтаксис
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};
Обязательное начало
запроса
Обязательный конец
запроса

Синтаксис
var query = from book in list
where book.Category == ".NET"
orderby book.NumberOfCopies
select new { book.Title, book.Author};
Обязательное начало
запроса
Обязательный конец
запроса
В середине
запроса
могут
содержаться
одно или более
условий:
where
orderby
join
let
from
into

Ключевые слова
C# LINQ
ANSI SQL

Отложенное выполение
string[] colors = { "Red", "Brown", "Orange", "Yellow", "Black", "Green", "White", "Violet", "Blue" };
IEnumerable
results = from c in colors
where c.StartsWith("B")
orderby c
select c;
foreach (var color in results)
{
txtLog.AppendText(color + ",");
}
Output: Brown, Black, Blue

Отложенное выполение
string[] colors = { "Red", "Brown", "Orange", "Yellow", "Black", "Green", "White", "Violet", "Blue" };
IEnumerable
results = from c in colors
where c.StartsWith("B")
orderby c
select c;
colors[4] = "Slate";
foreach (var color in results)
{
txtLog.AppendText(color + ",");
}
Output: Brown, Blue

Query Extension Methods
Enumerable static methods
Empty
var numbers = Enumerable.Empty
();
Range
var numbers = Enumerable.Range(1, 5);
Output: 1, 2, 3, 4, 5
Repeat
var numbers = Enumerable.Repeat(10, 5);
Output: 10, 10, 10, 10, 10

Query Extension Methods
All, Any
All
bool result = GetCars().All(c => c.Year > 1960);
Any
bool result = GetCars().Any(c => c.Year <= 1960);

Query Extension Methods AsEnumerable
public class MyStringList : List
{
public IEnumerable
Where(Predicate
filter) {
return this.Select(s => filter(s) ? s.ToUpper() : s);
}
}
var strings = new MyStringList {"orange", "apple", "grape", "pear"};
foreach (var item in strings.Where(s => s.Length == 5))
{
txtLog.Write(item);
}
Output: orange, APPLE, GRAPE, pear

Query Extension Methods AsEnumerable
public class MyStringList : List
{
public IEnumerable
Where(Predicate
filter) {
return this.Select(s => filter(s) ? s.ToUpper() : s);
}
}
var strings = new MyStringList {"orange", "apple", "grape", "pear"};
foreach (var item in strings.AsEnumerable().Where(s => s.Length == 5))
{
txtLog.Write(item);
}
Output: apple, grape

Query Extension Methods
AsQueryable
IEnumerable
strings = new MyStringList {"orange", "apple", "grape", "pear"};
var querable = strings.AsQueryable();
txtLog.WriteLine("Element Type: {0}", querable.ElementType);
txtLog.WriteLine("Expression: {0}", querable.Expression);
txtLog.WriteLine("Provider: {0}", querable.Provider);
Output:
Element Type: System.String
Expression: MyStringList
Provider: MyStringList

Query Extension Methods
ToArray, ToList
int[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };
var evenScores = scores.Where(s => s % 2 == 0).ToList(); // ToArray()
scores[2] = 2;
foreach (var item in evenScores)
{
txtLog.WriteLine(item);
}
Output:
88
56
78
90

Query Extension Methods
ToDictionary, ToLookUp
var cars = GetCars();
var carsByVin = cars.ToDictionary(c => c.VIN);
Car myCar = carsByVin["HIJ123"];
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Model:{2} Year:{3}",
myCar.VIN, myCar.Make, myCar.Model, myCar.Year);
Output:
Car VIN:HIJ123, Make:VW, Model:Bug Year:1956

Query Extension Methods
Cast, OfType
int[] scores = {88, 56, 23, 99, 65, 93, 78, 23, 99, 90};
IEnumerable
objects = scores.Cast
();
object[] items = new object[] {55, "Hello", 22, "Goodbye"};
foreach (var intItem in items.OfType
())
{
txtLog.WriteLine(intItem);
}
Output:
55
22
Слайд 42
Query Extension Methods
Max, Min, Average, Sum, Count
int[] scores = {88, 56, 23,
99, 65, 93, 78, 23, 99, 90};
txtLog.WriteLine("Max: " + scores.Max());
txtLog.WriteLine("Min: " + scores.Min());
txtLog.WriteLine("Average: " + scores.Average());
txtLog.WriteLine("Sum: " + scores.Sum());
txtLog.WriteLine("Count: " + scores.Count());
Output:
Max: 99
Min: 23
Average: 71,4
Sum: 714
Count: 10
Слайд 43
Query Extension Methods
ElementAt, First, Last
int[] scores = {88, 56, 23, 99, 65,
93, 78, 23, 99, 90};
txtLog.WriteLine(scores.ElementAt(4));
txtLog.WriteLine(scores.First());
txtLog.WriteLine(scores.Last());
Output:
65
88
90
Слайд 44
Query Extension Methods
ElementAtOrDefault, FirstOrDefault, LastOrDefault
int[] scores = {};
txtLog.WriteLine(scores.ElementAtOrDefault(4));
txtLog.WriteLine(scores.FirstOrDefault());
txtLog.WriteLine(scores.LastOrDefault());
Output:
0
0
0
Слайд 45
Query Extension Methods
Single, SingleOrDefault
int[] scores = {88, 56, 23, 99, 65, 93,
78, 23, 99, 90};
int score1 = scores.Where(x => x > 50 && x < 60).Single();
int score2 = scores.Where(x => x > 100).SingleOrDefault();
txtLog.WriteLine(score1);
txtLog.WriteLine(score2);
Output:
56
0
Слайд 46
Query Extension Methods
DefaultIfEmpty
List
cars = new List
();
IEnumerable
oneNullCar = cars.DefaultIfEmpty();
foreach (var car
in oneNullCar)
{
txtLog.WriteLine(car == null ? "Null Car" : "Not Null Car");
}
Output: Null Car
Слайд 47
Query Extension Methods
Contains
int[] scores = { 88, 56, 23, 99, 65, 93,
78, 23, 99, 90 };
txtLog.WriteLine(scores.Contains(56));
txtLog.WriteLine(scores.Contains(24));
Output:
True
False
Слайд 48
Query Extension Methods
Distinct
int[] scores = { 88, 56, 23, 99, 65, 93,
78, 23, 99, 90 };
foreach (var score in scores.Distinct())
{
txtLog.Write(score);
}
Output: 88, 56, 23, 99, 65, 93, 78, 90
Слайд 49
Query Extension Methods
Concat
int[] lastYearScores = { 88, 56, 23, 99, 65 };
int[]
thisYearScores = { 93, 78, 23, 99, 90 };
foreach (var item in lastYearScores.Concat(thisYearScores))
{
txtLog.Write(item);
}
Output: 88, 56, 23, 99, 65, 93, 78, 23, 99, 90
Слайд 50
Query Extension Methods
Except
int[] lastYearScores = { 88, 56, 23, 99, 65 };
int[]
thisYearScores = { 93, 78, 23, 99, 90 };
foreach (var item in lastYearScores.Except(thisYearScores))
{
txtLog.WriteLine(item);
}
Output:
88
56
65
Слайд 51
Query Extension Methods
Intersect
int[] lastYearScores = { 88, 56, 23, 99, 65 };
int[]
thisYearScores = { 93, 78, 23, 99, 90 };
foreach (var item in lastYearScores.Intersect(thisYearScores))
{
txtLog.WriteLine(item);
}
Output:
23
99
Слайд 52
Query Extension Methods
Union
int[] lastYearScores = { 88, 56, 23, 99, 65, 56
};
int[] thisYearScores = { 93, 78, 23, 99, 90, 99 };
var allScores = lastYearScores.Union(thisYearScores);
foreach (var item in allScores.OrderBy(s => s))
{
txtLog.WriteLine(item);
}
Output: 23, 56, 65, 78, 88, 90, 93, 99
Слайд 53
Query Extension Methods
Zip
var numbers = Enumerable.Range(1, 1000);
var cars = GetCars();
var zip =
numbers.Zip(cars, (i, c) => new
{
Number = i,
CarMake = c.Make
});
foreach (var it in zip)
{
txtLog.WriteLine("Number:{0} Make:{1}", it.Number, it.CarMake);
}
Output:
Number:1 CarMake:Ford
Number:2 CarMake:BMW
Number:3 CarMake:Audi
Number:4 CarMake:VW
Number:5 CarMake:Ford
Слайд 54
Query Extension Methods
Reverse
int[] scores = { 88, 56, 23, 99, 65, 93,
78, 23, 99, 90 };
foreach (var score in scores.Reverse())
{
txtLog.Write(score);
}
Output: 90, 99, 23, 78, 93, 65, 99, 23, 56, 88
Слайд 55
Query Extension Methods
SequenceEqual
List
lastYearScores = new List
{93, 78, 23, 99, 91};
List
thisYearScores = new List
{93, 78, 23, 99, 90};
txtLog.WriteLine(lastYearScores.SequenceEqual(thisYearScores));
lastYearScores[4] = 90;
txtLog.WriteLine(lastYearScores.SequenceEqual(thisYearScores));
Output:
False
True
Слайд 56
Query Extension Methods
Skip, SkipWhile
int[] scores = { 88, 56, 23, 99, 65,
93, 78, 23, 99, 90 };
foreach (var s in scores.OrderBy(i => i).Skip(9))
{ txtLog.WriteLine(s); }
Output: 99
foreach (var s in scores.OrderBy(i => i).SkipWhile(s => s < 80))
{ txtLog.Write(s); }
Output: 88, 90, 93, 99, 99
foreach (var s in scores.SkipWhile(s => s < 80))
{ txtLog.Write(s); }
Output: 88, 56, 23, 99, 65, 93, 78, 23, 99, 90
Слайд 57
Query Extension Methods
Take, TakeWhile
int[] scores = { 88, 56, 23, 99, 65,
93, 78, 23, 99, 90 };
foreach (var item in scores.OrderBy(i => i).Skip(3).Take(2))
{
txtLog.Write(item);
}
Output: 65, 78
foreach (var item in scores.OrderBy(i => i).TakeWhile(s => s < 80))
{
txtLog.WriteLine(item);
}
Output: 23, 23, 56, 65, 78
Слайд 58
Query Extension Methods
GroupBy
var cars = GetCars();
var query = cars.GroupBy(c => c.Make);
foreach (IGrouping
Car> group in query)
{
txtLog.WriteLine("Key:{0}", group.Key);
foreach (Car c in group)
{ txtLog.WriteLine("Car VIN:{0} Make:{1}", c.VIN, c.Make); }
}
Output:
Key:Ford
Car VIN:ABC123 Make:Ford
Car VIN:DEF456 Make:Ford
Key:BMW
Car VIN:DEF123 Make:BMW
Key:Audi
Car VIN:ABC456 Make:Audi
Key:VW
Car VIN:HIJ123 Make:VW
Слайд 59
Query Extension Methods
OrderBy, OrderByDescending, ThenBy, ThenByDescending
var cars = GetCars().OrderBy(c => c.Make)
.ThenByDescending(c
=> c.Model)
.ThenBy(c => c.Year);
foreach (var item in cars)
{
txtLog.WriteLine("Car VIN:{0} Make:{1} Model:{2} Year:{3}",
item.VIN, item.Make, item.Model, item.Year);
}
Output:
Car VIN:ABC456 Make:Audi Model:TT Year:2008
Car VIN:DEF123 Make:BMW Model:Z-3 Year:2005
Car VIN:ABC123 Make:Ford Model:F-250 Year:2000
Car VIN:DEF456 Make:Ford Model:F-150 Year:1998
Car VIN:HIJ123 Make:VW Model:Bug Year:1956
Слайд 60
Query Extension Methods
Where
var cars = GetCars();
foreach (var myCar in cars.Where(c => c.Make
== "Ford"))
{
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Model:{2} Year:{3}",
myCar.VIN, myCar.Make, myCar.Model, myCar.Year);
}
Output:
Car VIN:ABC123, Make:Ford, Model:F-250 Year:2000
Car VIN:DEF456, Make:Ford, Model:F-150 Year:1998
Слайд 61
Query Extension Methods
Select
var vehicles = new List
>
{
Tuple.Create("123", "VW",
1999),
Tuple.Create("234", "Ford", 2009),
Tuple.Create("567", "Audi", 2005),
Tuple.Create("678", "Ford", 2003),
Tuple.Create("789", "Mazda", 2003),
Tuple.Create("999", "Ford", 1965)
};
Слайд 62
Query Extension Methods
Select
var fordCars = vehicles
.Where(v => v.Item2 == "Ford")
.Select(v
=> new Car
{
VIN = v.Item1,
Make = v.Item2,
Year = v.Item3
});
foreach (var item in fordCars)
{
txtLog.WriteLine("Car VIN:{0} Make:{1} Year:{2}",
item.VIN, item.Make, item.Year);
}
Слайд 63
Query Extension Methods
Select
Output:
Car VIN:234 Make:Ford Year:2009
Car VIN:678 Make:Ford Year:2003
Car VIN:999 Make:Ford
Year:1965
Слайд 64
Query Extension Methods
Select
var fordCars = from v in vehicles
let makeYear =
v.Item2 + " " + v.Item3
where makeYear.StartsWith("Ford")
select new
{
VIN = v.Item1,
MakeYear = makeYear
};
foreach (var item in fordCars)
{
txtLog.WriteLine("Car VIN:{0} MakeYear:{1}",
item.VIN, item.MakeYear);
}
Слайд 65
Query Extension Methods
Select
Output:
Car VIN:234 MakeYear:Ford 2009
Car VIN:678 MakeYear:Ford 2003
Car VIN:999 MakeYear:Ford
1965
Слайд 66
Query Extension Methods
SelectMany
var repairs = new List
>>
{
Tuple.Create("ABC123",
new List
{"Rotate Tires", "Change oil"}),
Tuple.Create("DEF123",
new List
{"Fix Flat", "Wash Vehicle"}),
Tuple.Create("ABC456",
new List
{"Alignment", "Vacuum", "Wax"}),
Tuple.Create("HIJ123",
new List
{"Spark plugs", "Air filter"}),
Tuple.Create("DEF456",
new List
{"Wiper blades", "PVC valve"}),
};
Слайд 67
Query Extension Methods
SelectMany
var query = repairs.SelectMany(t =>
t.Item2.Select(r => new { VIN
= t.Item1, Repair = r }));
foreach (var item in query)
{
txtLog.WriteLine("VIN:{0} Repair:{1}", item.VIN, item.Repair);
}
Слайд 68
Query Extension Methods
SelectMany
Output:
VIN:ABC123 Repair:Rotate Tires
VIN:ABC123 Repair:Change oil
VIN:DEF123 Repair:Fix Flat
VIN:DEF123 Repair:Wash
Vehicle
VIN:ABC456 Repair:Alignment
VIN:ABC456 Repair:Vacuum
VIN:ABC456 Repair:Wax
VIN:HIJ123 Repair:Spark plugs
VIN:HIJ123 Repair:Air filter
VIN:DEF456 Repair:Wiper blades
VIN:DEF456 Repair:PVC valve
Слайд 69
Query Extension Methods
Join
var makes = new string[] { "Audi", "BMW", "Ford", "Mazda",
"VW" };
var cars = GetCars();
var query = makes.Join(cars,
make => make, car => car.Make,
(make, innerCar) => new { Make = make, Car = innerCar });
foreach (var item in query)
{
txtLog.WriteLine("Make: {0}, Car:{1} {2} {3}",
item.Make, item.Car.VIN, item.Car.Make, item.Car.Model);
}
Output:
Make: Audi, Car:ABC456 Audi TT
Make: BMW, Car:DEF123 BMW Z-3
Make: Ford, Car:ABC123 Ford F-250
Make: Ford, Car:DEF456 Ford F-150
Make: VW, Car:HIJ123 VW Bug
Слайд 70
Query Extension Methods
GroupJoin
var makes = new string[] { "Audi", "BMW", "Ford", "Mazda",
"VW" };
var cars = GetCars();
var query = makes.GroupJoin(cars,
make => make, car => car.Make,
(make, innerCars) => new { Make = make, Cars = innerCars });
foreach (var item in query)
{
txtLog.WriteLine("Make: {0}", item.Make);
foreach (var car in item.Cars)
{ txtLog.WriteLine("Car VIN:{0}, Model:{1}", car.VIN, car.Model); }
}
Output:
Make: Audi
Car VIN:ABC456, Model:TT
Make: BMW
Car VIN:DEF123, Model:Z-3
Make: Ford
Car VIN:ABC123, Model:F-250
Car VIN:DEF456, Model:F-150
Слайд 71
LINQ Joins
public class Repair {
public string VIN { get; set; }
public string Desc { get; set; }
public decimal Cost { get; set; }
}
private List
GetRepairs()
{
return new List
{
new Repair {VIN = "ABC123", Desc = "Change Oil", Cost = 29.99m},
new Repair {VIN = "DEF123", Desc = "Rotate Tires", Cost =19.99m},
new Repair {VIN = "HIJ123", Desc = "Replace Brakes", Cost = 200},
new Repair {VIN = "DEF456", Desc = "Alignment", Cost = 30},
new Repair {VIN = "ABC123", Desc = "Fix Flat Tire", Cost = 15},
new Repair {VIN = "DEF123", Desc = "Fix Windshield", Cost =420},
new Repair {VIN = "ABC123", Desc = "Replace Wipers", Cost = 20},
new Repair {VIN = "HIJ123", Desc = "Replace Tires", Cost = 1000},
new Repair {VIN = "DEF456", Desc = "Change Oil", Cost = 30} };
}
Слайд 72
LINQ Joins
Inner join
var cars = GetCars();
var repairs = GetRepairs();
var carsWithRepairs
= from c in cars
join r in repairs
on c.VIN equals r.VIN
orderby c.VIN, r.Cost
select new
{
c.VIN,
c.Make,
r.Desc,
r.Cost
};
foreach (var item in carsWithRepairs)
{
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Description:{2} Cost:{3:C}",
item.VIN, item.Make, item.Desc, item.Cost);
}
Слайд 73
LINQ Joins
Inner join
Output:
Car VIN:ABC123, Make:Ford, Description:Fix Flat Tire Cost:$15.00
Car VIN:ABC123, Make:Ford, Description:Replace
Wipers Cost:$20.00
Car VIN:ABC123, Make:Ford, Description:Change Oil Cost:$29.99
Car VIN:DEF123, Make:BMW, Description:Rotate Tires Cost:$19.99
Car VIN:DEF123, Make:BMW, Description:Fix Windshield Cost:$420.00
Car VIN:DEF456, Make:Ford, Description:Alignment Cost:$30.00
Car VIN:DEF456, Make:Ford, Description:Change Oil Cost:$30.00
Car VIN:HIJ123, Make:VW, Description:Replace Brakes Cost:$200.00
Car VIN:HIJ123, Make:VW, Description:Replace Tires Cost:$1,000.00
Слайд 74
LINQ Joins
Outer join
var carsWithRepairs = from c in cars
join r in
repairs
on c.VIN equals r.VIN into g
from r in g.DefaultIfEmpty()
orderby c.VIN, r == null ? 0 : r.Cost
select new
{
c.VIN,
c.Make,
Desc = r == null ? "***No Repairs***" : r.Desc,
Cost = r == null ? 0 : r.Cost
};
foreach (var item in carsWithRepairs)
{
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Description:{2} Cost:{3:C}",
item.VIN, item.Make, item.Desc, item.Cost);
}
Слайд 75
LINQ Joins
Outer join
Output:
Car VIN:ABC123, Make:Ford, Description:Fix Flat Tire Cost:$15.00
Car VIN:ABC123, Make:Ford, Description:Replace
Wipers Cost:$20.00
Car VIN:ABC123, Make:Ford, Description:Change Oil Cost:$29.99
Car VIN:ABC456, Make:Audi, Description:***No Repairs*** Cost:$0.00
Car VIN:DEF123, Make:BMW, Description:Rotate Tires Cost:$19.99
Car VIN:DEF123, Make:BMW, Description:Fix Windshield Cost:$420.00
Car VIN:DEF456, Make:Ford, Description:Alignment Cost:$30.00
Car VIN:DEF456, Make:Ford, Description:Change Oil Cost:$30.00
Car VIN:HIJ123, Make:VW, Description:Replace Brakes Cost:$200.00
Car VIN:HIJ123, Make:VW, Description:Replace Tires Cost:$1,000.00
Слайд 76
LINQ Joins
Cross join
var cars = GetCars();
var colors = new string[] { "Red",
"Blue", "Green" };
var carsWithRepairs = from car in cars
from color in colors
orderby car.VIN, color
select new
{
car.VIN,
car.Make,
car.Model,
Color = color
};
foreach (var item in carsWithRepairs)
{
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Model:{2} Color:{3}",
item.VIN, item.Make, item.Model, item.Color);
}
Слайд 77
LINQ Joins
Cross join
Output:
Car VIN:ABC123, Make:Ford, Model:F-250 Color:Blue
Car VIN:ABC123, Make:Ford, Model:F-250 Color:Green
Car
VIN:ABC123, Make:Ford, Model:F-250 Color:Red
Car VIN:ABC456, Make:Audi, Model:TT Color:Blue
Car VIN:ABC456, Make:Audi, Model:TT Color:Green
Car VIN:ABC456, Make:Audi, Model:TT Color:Red
Car VIN:DEF123, Make:BMW, Model:Z-3 Color:Blue
Car VIN:DEF123, Make:BMW, Model:Z-3 Color:Green
Car VIN:DEF123, Make:BMW, Model:Z-3 Color:Red
Car VIN:DEF456, Make:Ford, Model:F-150 Color:Blue
Car VIN:DEF456, Make:Ford, Model:F-150 Color:Green
Car VIN:DEF456, Make:Ford, Model:F-150 Color:Red
Car VIN:HIJ123, Make:VW, Model:Bug Color:Blue
Car VIN:HIJ123, Make:VW, Model:Bug Color:Green
Car VIN:HIJ123, Make:VW, Model:Bug Color:Red
Имя файла: Введение-в-LINQ-.pptx
Количество просмотров: 310
Количество скачиваний: 2
Скачать
- Предыдущая
The Institute of Semiconductor Physics
Следующая -
NHibernate
Похожие презентации
Мир бабочек
История возникновения платья
ОПЫТ РАЗРАБОТКИ ДОКУМЕНТАЦИИ СЗПДн. МОДЕЛЬ УГРОЗ БЕЗОПАСНОСТИ ПДн.
Типы проектов. Структура индивидуального проекта
YunEk
Презентация на тему Притяжение Земли (2 класс)
Устройства вывода информации
Социальный блоггер
Россия против Террора
Call Me service. Interpretation quality
Добро и зло. Понятие греха, раскаяния и воздаяния
Средства вызова подпрограмм и задач
Портрет школьного стрелка
Техника метания малого мяча
Презентация на тему Программа "Развитие"
Национальный исследовательский университет «МЭИ»
Организация, вооружение и боевая техника мотострелкового (танкового) батальона
Флаги стран мира
Презентация на тему Конспект лекции по микроэкономике
360 - вчера 360+365 – завтра!
Microsoft Lumia 5000
А.С.Грибоедов: жизнь и судьба
Презентация на тему Керлинг
параграф 2 урок
Формирование у детей ценностного отношения к своему здоровью
Урок презентация Иван Сергеевич Тургенев
Корпоративное обучение иностранным языкам
Избирательная система Российской Федерации. Тема 14
(function(d,s){d.getElementById("licnt7D89").src=
"https://counter.yadro.ru/hit?t12.1;r"+escape(d.referrer)+
((typeof(s)=="undefined")?"":";s"+s.width+"*"+s.height+"*"+
(s.colorDepth?s.colorDepth:s.pixelDepth))+";u"+escape(d.URL)+
";h"+escape(d.title.substring(0,150))+";"+Math.random()})
(document,screen)
Обратная связь
Для правообладателей
Email:
Нажмите что бы посмотреть
window.__NUXT__=(function(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U){return {data:{meta:{result:{meta:{h1:l,main_text:b,main_title:m,main_description:n,main_keywords:o,main_image:b},app:{logo_image:p,logo_image_width:i,logo_image_height:q,logo_text:r,image_width_full:s,image_width_min:t,recaptcha_key:u,yandex_search:v,ya_context:e,banner_1:b,banner_2:b,banner_3:b,banner_4:b,banner_5:b,banner_6:b,banner_7:b,banner_8:b,banner_9:b,banner_10:b,email:w,footer_before:x,footer:y,dark_theme:c,strategy:{image_alt_words:h,item_slide_header:z,item_images:A,item_images_tag:B,item_words_h3:c,item_words_tag:C,item_words_1:h,routing:D,item_slide_skipping:E,item_download_timeout:F,item_slider_width:a,item_show_pdf:c,item_show_contents:c,item_show_filename:e},colors:{header_text:j,header_bg:k,accent:G}},social:H}},item:{result:{id:377573,name:"Введение в LINQ ",category:I,count:78,jpg:"jpg\u002F377573",hits:310,download:J,h1:K,meta:{h1:K,title:"Введение в LINQ презентация",description:"Введение в LINQ презентация, доклад, проект, Разное ",keywords:"Введение в LINQ , презентация, доклад, проект, скачать презентацию на тему, PowerPoint, скачати презентацію, фон, шаблон, урок, конспект, класс, школа, класс, Разное",download_link:b},text:"\u003Cp style=\"text-align: justify;\" \u002F\u003EПрезентация на тему Введение в LINQ , из раздела: Разное.&nbsp; Презентацию в формате PowerPoint (pptx) можно скачать внизу страницы, поделившись ссылкой в социальных сетях! Презентации взяты из открытого доступа или загружены их авторами, администрация сайта не отвечает за достоверность информации в них. Все права принадлежат авторам материалов: \u003Ca href=\"politika-zashchity-avtorskih-prav\"\u003EПолитика защиты авторских прав\u003C\u002Fa\u003E",seo_text:"\u003Cp\u003EСоставляющие LINQ\u003Cbr\u003E\u003Cp\u003EАвтоматические свойства\u003Cbr\u003EИнициализаторы объектов и коллекций\u003Cbr\u003EАнонимные типы\u003Cbr\u003EМетоды расширения\u003Cbr\u003EЛямбда-выражения\u003Cbr\u003E \u003Cp\u003EАвтоматические свойства\u003Cbr\u003E\u003Cp\u003Eprivate string _firstName;\u003Cbr\u003E\u003Cbr\u003Epublic string firstName\u003Cbr\u003E{\u003Cbr\u003E get { return _firstName; }\u003Cbr\u003E set { _firstName = value; }\u003Cbr\u003E}\u003Cbr\u003E\u003Cbr\u003E",file:"Введение-в-LINQ-.pptx",texts:["\u003Cp\u003EВведение в LINQ\u003Cbr\u003E\u003Cp\u003ENatalie Vegerina\u003Cbr\u003ESoftware engineer\u003Cbr\u003EInfostroy Ltd, \u003Cbr\u003EKharkov, Ukraine\u003Cbr\u003E","\u003Cp\u003EСоставляющие LINQ\u003Cbr\u003E\u003Cp\u003EАвтоматические свойства\u003Cbr\u003EИнициализаторы объектов и коллекций\u003Cbr\u003EАнонимные типы\u003Cbr\u003EМетоды расширения\u003Cbr\u003EЛямбда-выражения\u003Cbr\u003E","\u003Cp\u003EАвтоматические свойства\u003Cbr\u003E\u003Cp\u003Eprivate string _firstName;\u003Cbr\u003Epublic string firstName\u003Cbr\u003E{\u003Cbr\u003E get { return _firstName; }\u003Cbr\u003E set { _firstName = value; }\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EАвтоматические свойства\u003Cbr\u003E\u003Cp\u003Eprivate string _firstName;\u003Cbr\u003Epublic string firstName\u003Cbr\u003E{\u003Cbr\u003E get { return _firstName; }\u003Cbr\u003E set { _firstName = value; }\u003Cbr\u003E}\u003Cbr\u003E\u003Cbr\u003E\u003Cbr\u003Epublic string FirstName { get; set; }\u003Cbr\u003E","\u003Cp\u003EНеявно типизированные \r\nлокальные переменные\u003Cbr\u003E\u003Cp\u003Evar i = 5;\u003Cbr\u003Evar s = \"Hello\";\u003Cbr\u003Evar d = 1.0;\u003Cbr\u003Evar numbers = new int[] { 1, 2, 3 };\u003Cbr\u003E","\u003Cp\u003EПравила неявно типизированных локальных переменных\u003Cbr\u003E\u003Cp\u003E var x; \u002F\u002F Ошибка\u003Cbr\u003E var y = {1, 2, 3}; \u002F\u002F Ошибка\u003Cbr\u003E var z = null; \u002F\u002F Ошибка\u003Cbr\u003E var не может использоваться в полях в области действия класса.\u003Cbr\u003E int i = (i = 20); \u002F\u002F ОК\u003Cbr\u003E var i = (i = 20); \u002F\u002F Ошибка\u003Cbr\u003E var a = 5, b = 10; \u002F\u002F Ошибка\u003Cbr\u003E Если тип с именем var находится в области действия, то ключевое слово var будет преобразовано в это имя типа и не будет обрабатываться как часть неявно типизированного объявления локальной переменной.\u003Cbr\u003E","\u003Cp\u003EИнициализаторы объектов\u003Cbr\u003E\u003Cp\u003Epublic class Car\u003Cbr\u003E{\u003Cbr\u003E public string VIN { get; set; }\u003Cbr\u003E public string Make { get; set; }\u003Cbr\u003E public string Model { get; set; }\u003Cbr\u003E public int Year { get; set; }\u003Cbr\u003E public string Color { get; set; }\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EИнициализаторы объектов\u003Cbr\u003E\u003Cp\u003ECar c = new Car();\u003Cbr\u003Ec.VIN = \"ABC123\";\u003Cbr\u003Ec.Make = \"Ford\";\u003Cbr\u003Ec.Model = \"F-250\";\u003Cbr\u003Ec.Year = 2000;\u003Cbr\u003E\u003Cbr\u003E\u003Cbr\u003E","\u003Cp\u003EИнициализаторы объектов\u003Cbr\u003E\u003Cp\u003ECar c = new Car();\u003Cbr\u003Ec.VIN = \"ABC123\";\u003Cbr\u003Ec.Make = \"Ford\";\u003Cbr\u003Ec.Model = \"F-250\";\u003Cbr\u003Ec.Year = 2000;\u003Cbr\u003E\u003Cbr\u003E\u003Cbr\u003ECar c = new Car()\u003Cbr\u003E{\u003Cbr\u003E VIN = \"ABC123\",\u003Cbr\u003E Make = \"Ford\",\u003Cbr\u003E Model = \"F-250\",\u003Cbr\u003E Year = 2000\u003Cbr\u003E};\u003Cbr\u003E","\u003Cp\u003EИнициализаторы коллекций\u003Cbr\u003E\u003Cp\u003Eprivate List\u003CCar\u003E GetCars()\u003Cbr\u003E{\u003Cbr\u003E return new List\u003CCar\u003E\u003Cbr\u003E {\u003Cbr\u003E new Car { VIN = \"ABC123\", Make = \"Ford\",\u003Cbr\u003E Model = \"F-250\", Year = 2000 },\u003Cbr\u003E new Car { VIN = \"DEF123\", Make = \"BMW\",\u003Cbr\u003E Model = \"Z-3\", Year = 2005 },\u003Cbr\u003E new Car { VIN = \"ABC456\", Make = \"Audi\",\u003Cbr\u003E Model = \"TT\", Year = 2008 },\u003Cbr\u003E new Car { VIN = \"HIJ123\", Make = \"VW\",\u003Cbr\u003E Model = \"Bug\", Year = 1956 },\u003Cbr\u003E new Car { VIN = \"DEF456\", Make = \"Ford\",\u003Cbr\u003E Model = \"F-150\", Year = 1998 }\u003Cbr\u003E };\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EАнонимные типы\u003Cbr\u003Evar car = new { Make = \"VW\", Model = \"Bug\" };\u003Cbr\u003E","\u003Cp\u003EМетоды расширения\u003Cbr\u003E\u003Cp\u003Epublic static class MyExtensions\u003Cbr\u003E{\u003Cbr\u003E public static bool IsValidEmailAddress(this string s)\u003Cbr\u003E {\u003Cbr\u003E Regex regex = new Regex(@\"^[\\w-\\.]+@([\\w-]+\\.)+[\\w-]{2,4}$\");\u003Cbr\u003E return regex.IsMatch(s);\u003Cbr\u003E }\u003Cbr\u003E}\u003Cbr\u003E\u003Cbr\u003Estring s = \"[e-mail]\";\u003Cbr\u003Ebool result = s.IsValidEmailAddress();\u003Cbr\u003E","\u003Cp\u003EПравила методов расширений\u003Cbr\u003E\u003Cp\u003EМетод расширения и класс, в котором он объявлен, должны быть статическими с модификатором public\u003Cbr\u003EПервый параметр определяет, с каким типом оперирует метод, и перед параметром идет модификатор this\u003Cbr\u003EМетоды расширения не могут получить доступ к закрытым переменным типа, для расширения которого они используются\u003Cbr\u003EМетоды расширения находятся в области действия, только если пространство имен было явно импортировано в исходный код с помощью директивы using \u003Cbr\u003EМетоды расширения не могут переопределить методы класса\u003Cbr\u003E","\u003Cp\u003EАнонимные методы\u003Cbr\u003E\u003Cp\u003EList\u003CCar\u003E cars = GetCars();\u003Cbr\u003EList\u003CCar\u003E filtered = new List\u003CCar\u003E();\u003Cbr\u003Eforeach (Car car in cars)\u003Cbr\u003E{\u003Cbr\u003E if (car.Year \u003E 2000 && car.Model.StartsWith(\"F\"))\u003Cbr\u003E {\u003Cbr\u003E filtered.Add(car);\u003Cbr\u003E }\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EАнонимные методы\u003Cbr\u003E\u003Cp\u003EList\u003CCar\u003E cars = GetCars();\u003Cbr\u003EList\u003CCar\u003E filtered = new List\u003CCar\u003E();\u003Cbr\u003Eforeach (Car car in cars)\u003Cbr\u003E{\u003Cbr\u003E if (FilterYear(car) && FilterModel(car))\u003Cbr\u003E {\u003Cbr\u003E filtered.Add(car);\u003Cbr\u003E }\u003Cbr\u003E}\u003Cbr\u003Epublic bool FilterYear(Car car) { return car.Year \u003E 2000; }\u003Cbr\u003Epublic bool FilterModel(Car car) { return car.Model.StartsWith(\"F\"); }\u003Cbr\u003E","\u003Cp\u003EАнонимные методы\u003Cbr\u003E\u003Cp\u003Epublic delegate bool FilterPredicate(Car car);\u003Cbr\u003Epublic bool CheckPredicates(Car car, IList\u003CFilterPredicate\u003E predicates)\u003Cbr\u003E{\u003Cbr\u003E foreach (FilterPredicate p in predicates)\u003Cbr\u003E {\u003Cbr\u003E if (!p(car)) { return false; }\u003Cbr\u003E }\u003Cbr\u003E return true;\u003Cbr\u003E}\u003Cbr\u003E\u003Cbr\u003E","\u003Cp\u003EАнонимные методы\u003Cbr\u003E\u003Cp\u003EList\u003CCar\u003E cars = GetCars();\u003Cbr\u003EList\u003CFilterPredicate\u003E predicates = new List\u003CFilterPredicate\u003E();\u003Cbr\u003Epredicates.Add(delegate(Car car) { return car.Year \u003E 2000; });\u003Cbr\u003Epredicates.Add(delegate(Car car) { return car.Model.StartsWith(\"F\"); });\u003Cbr\u003EList\u003CCar\u003E filtered = new List\u003CCar\u003E();\u003Cbr\u003Eforeach (Car car in cars)\u003Cbr\u003E{\u003Cbr\u003E if (CheckPredicates(car, predicates)) { filtered.Add(car); }\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EАнонимные методы\u003Cbr\u003E\u003Cp\u003EList\u003CCar\u003E cars = GetCars();\u003Cbr\u003EList\u003CFilterPredicate\u003E predicates = new List\u003CFilterPredicate\u003E();\u003Cbr\u003Epredicates.Add ((Car car) =\u003E car.Year \u003E 2000);\u003Cbr\u003Epredicates.Add((Car car) =\u003E car.Model.StartsWith(\"F\"));\u003Cbr\u003EList\u003CCar\u003E filtered = new List\u003CCar\u003E();\u003Cbr\u003Eforeach (Car car in cars)\u003Cbr\u003E{\u003Cbr\u003E if (CheckPredicates(car, predicates)) { filtered.Add(car); }\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EАнонимные методы\u003Cbr\u003E\u003Cp\u003EList\u003CCar\u003E cars = GetCars();\u003Cbr\u003EList\u003CFilterPredicate\u003E predicates = new List\u003CFilterPredicate\u003E();\u003Cbr\u003Epredicates.Add (car =\u003E car.Year \u003E 2000);\u003Cbr\u003Epredicates.Add(car =\u003E car.Model.StartsWith(\"F\"));\u003Cbr\u003EList\u003CCar\u003E filtered = new List\u003CCar\u003E();\u003Cbr\u003Eforeach (Car car in cars)\u003Cbr\u003E{\u003Cbr\u003E if (CheckPredicates(car, predicates)) { filtered.Add(car); }\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EЛямбда-выражения\u003Cbr\u003E\u003Cp\u003E(string s) =\u003E { return s.Length; }\u003Cbr\u003E (s) =\u003E { return s.Length; }\u003Cbr\u003E() =\u003E {\u002F* statement(s) *\u002F }\u003Cbr\u003E(s) =\u003E { return s.Length; }\u003Cbr\u003E\ts =\u003E { return s.Length; }\u003Cbr\u003E(x,y) =\u003E { return x \u003C y; }\u003Cbr\u003E","\u003Cp\u003EАрхитектура\u003Cbr\u003E\u003Cp\u003EC#\u003Cbr\u003E\u003Cp\u003E.NET Language Integrated Query (LINQ)\u003Cbr\u003E\u003Cp\u003ELINQ\r\nto SQL\u003Cbr\u003E\u003Cp\u003ELINQ\r\nto Objects\u003Cbr\u003E\u003Cp\u003ELINQ\r\nto XML\u003Cbr\u003E\u003Cp\u003ELINQ\r\nto Datasets\u003Cbr\u003E\u003Cp\u003ELINQ\r\nto Entities\u003Cbr\u003E\u003Cp\u003ELINQ data source providers\u003Cbr\u003E\u003Cp\u003EADO.NET support for LINQ\u003Cbr\u003E","\u003Cp\u003ELINQ-примеры\r\n(Query-синтаксис)\u003Cbr\u003E\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E","\u003Cp\u003ELINQ-примеры\r\n(Query-синтаксис)\u003Cbr\u003E\u003Cbr\u003E\t\t\t\t\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E\u003Cp\u003EИсточник данных\u003Cbr\u003E","\u003Cp\u003ELINQ-примеры\r\n(Query-синтаксис)\u003Cbr\u003E\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E\u003Cp\u003EИсточник данных\u003Cbr\u003E\u003Cp\u003EСсылка на сущность в\u003Cbr\u003Eисточнике данных\u003Cbr\u003E","\u003Cp\u003ELINQ-примеры\r\n(Query-синтаксис)\u003Cbr\u003E\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E\u003Cp\u003EИсточник данных\u003Cbr\u003E\u003Cp\u003EСсылка на сущность в\u003Cbr\u003Eисточнике данных\u003Cbr\u003E\u003Cp\u003EФильтрация и \u003Cbr\u003Eсортировка\u003Cbr\u003E","\u003Cp\u003ELINQ-примеры\r\n(Query-синтаксис)\u003Cbr\u003E\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E\u003Cp\u003EИсточник данных\u003Cbr\u003E\u003Cp\u003EСсылка на сущность в\u003Cbr\u003Eисточнике данных\u003Cbr\u003E\u003Cp\u003EФильтрация и \u003Cbr\u003Eсортировка\u003Cbr\u003E\u003Cp\u003EПреобразование\u003Cbr\u003Eданных\u003Cbr\u003E","\u003Cp\u003EСинтаксис\u003Cbr\u003E\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E","\u003Cp\u003EСинтаксис\u003Cbr\u003E\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E\u003Cp\u003EОбязательное начало\u003Cbr\u003Eзапроса\u003Cbr\u003E","\u003Cp\u003EСинтаксис\u003Cbr\u003E\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E\u003Cp\u003EОбязательное начало\u003Cbr\u003Eзапроса\u003Cbr\u003E\u003Cp\u003EОбязательный конец\u003Cbr\u003Eзапроса\u003Cbr\u003E","\u003Cp\u003EСинтаксис\u003Cbr\u003E\u003Cbr\u003E\t\t\t\tvar query = from book in list\u003Cbr\u003E\t\t\t\twhere book.Category == \".NET\"\u003Cbr\u003E\t\t\t\torderby book.NumberOfCopies\u003Cbr\u003E\t\t\t\tselect new { book.Title, book.Author};\u003Cbr\u003E\u003Cbr\u003E\u003Cp\u003EОбязательное начало\u003Cbr\u003Eзапроса\u003Cbr\u003E\u003Cp\u003EОбязательный конец\u003Cbr\u003Eзапроса\u003Cbr\u003E\u003Cp\u003EВ середине \u003Cbr\u003Eзапроса \u003Cbr\u003Eмогут \u003Cbr\u003Eсодержаться\u003Cbr\u003Eодно или более \u003Cbr\u003Eусловий:\u003Cbr\u003E where\u003Cbr\u003E orderby\u003Cbr\u003E join\u003Cbr\u003E let\u003Cbr\u003E from\u003Cbr\u003E into\u003Cbr\u003E","\u003Cp\u003EКлючевые слова\u003Cbr\u003E\u003Cp\u003EC# LINQ\u003Cbr\u003E\u003Cp\u003EANSI SQL\u003Cbr\u003E","\u003Cp\u003EОтложенное выполение\u003Cbr\u003E\u003Cp\u003Estring[] colors = { \"Red\", \"Brown\", \"Orange\", \"Yellow\", \"Black\", \"Green\", \"White\", \"Violet\", \"Blue\" };\u003Cbr\u003EIEnumerable\u003Cstring\u003E results = from c in colors\u003Cbr\u003E where c.StartsWith(\"B\")\u003Cbr\u003E orderby c\u003Cbr\u003E select c;\u003Cbr\u003Eforeach (var color in results)\u003Cbr\u003E{\u003Cbr\u003E txtLog.AppendText(color + \",\");\u003Cbr\u003E} \u003Cbr\u003EOutput: Brown, Black, Blue\u003Cbr\u003E","\u003Cp\u003EОтложенное выполение\u003Cbr\u003E\u003Cp\u003Estring[] colors = { \"Red\", \"Brown\", \"Orange\", \"Yellow\", \"Black\", \"Green\", \"White\", \"Violet\", \"Blue\" };\u003Cbr\u003EIEnumerable\u003Cstring\u003E results = from c in colors\u003Cbr\u003E where c.StartsWith(\"B\")\u003Cbr\u003E orderby c\u003Cbr\u003E select c;\u003Cbr\u003Ecolors[4] = \"Slate\";\u003Cbr\u003Eforeach (var color in results)\u003Cbr\u003E{\u003Cbr\u003E txtLog.AppendText(color + \",\");\u003Cbr\u003E}\u003Cbr\u003EOutput: Brown, Blue\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nEnumerable static methods\u003Cbr\u003E\u003Cp\u003EEmpty\u003Cbr\u003Evar numbers = Enumerable.Empty\u003Clong\u003E();\u003Cbr\u003ERange\u003Cbr\u003Evar numbers = Enumerable.Range(1, 5); \u003Cbr\u003EOutput: 1, 2, 3, 4, 5 \u003Cbr\u003ERepeat\u003Cbr\u003Evar numbers = Enumerable.Repeat(10, 5);\u003Cbr\u003EOutput: 10, 10, 10, 10, 10\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods \r\nAll, Any\u003Cbr\u003E\u003Cp\u003EAll\u003Cbr\u003Ebool result = GetCars().All(c =\u003E c.Year \u003E 1960);\u003Cbr\u003E\u003Cbr\u003EAny\u003Cbr\u003Ebool result = GetCars().Any(c =\u003E c.Year \u003C= 1960);\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods AsEnumerable\u003Cbr\u003E\u003Cp\u003Epublic class MyStringList : List\u003Cstring\u003E\u003Cbr\u003E{\u003Cbr\u003E public IEnumerable\u003Cstring\u003E Where(Predicate\u003Cstring\u003E filter)\u003Cbr\u003E {\u003Cbr\u003E return this.Select(s =\u003E filter(s) ? s.ToUpper() : s);\u003Cbr\u003E }\u003Cbr\u003E}\u003Cbr\u003Evar strings = new MyStringList {\"orange\", \"apple\", \"grape\", \"pear\"};\u003Cbr\u003Eforeach (var item in strings.Where(s =\u003E s.Length == 5))\u003Cbr\u003E{\u003Cbr\u003E txtLog.Write(item);\u003Cbr\u003E}\u003Cbr\u003EOutput: orange, APPLE, GRAPE, pear\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods AsEnumerable\u003Cbr\u003E\u003Cp\u003Epublic class MyStringList : List\u003Cstring\u003E\u003Cbr\u003E{\u003Cbr\u003E public IEnumerable\u003Cstring\u003E Where(Predicate\u003Cstring\u003E filter)\u003Cbr\u003E {\u003Cbr\u003E return this.Select(s =\u003E filter(s) ? s.ToUpper() : s);\u003Cbr\u003E }\u003Cbr\u003E}\u003Cbr\u003Evar strings = new MyStringList {\"orange\", \"apple\", \"grape\", \"pear\"};\u003Cbr\u003Eforeach (var item in strings.AsEnumerable().Where(s =\u003E s.Length == 5))\u003Cbr\u003E{\u003Cbr\u003E txtLog.Write(item);\u003Cbr\u003E}\u003Cbr\u003EOutput: apple, grape\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nAsQueryable\u003Cbr\u003E\u003Cp\u003EIEnumerable\u003Cstring\u003E strings = new MyStringList {\"orange\", \"apple\", \"grape\", \"pear\"};\u003Cbr\u003Evar querable = strings.AsQueryable();\u003Cbr\u003EtxtLog.WriteLine(\"Element Type: {0}\", querable.ElementType);\u003Cbr\u003EtxtLog.WriteLine(\"Expression: {0}\", querable.Expression);\u003Cbr\u003EtxtLog.WriteLine(\"Provider: {0}\", querable.Provider);\u003Cbr\u003EOutput:\u003Cbr\u003EElement Type: System.String\u003Cbr\u003EExpression: MyStringList\u003Cbr\u003EProvider: MyStringList \u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods \r\nToArray, ToList\u003Cbr\u003E\u003Cp\u003Eint[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };\u003Cbr\u003Evar evenScores = scores.Where(s =\u003E s % 2 == 0).ToList(); \u002F\u002F ToArray()\u003Cbr\u003Escores[2] = 2;\u003Cbr\u003Eforeach (var item in evenScores)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(item);\u003Cbr\u003E}\u003Cbr\u003EOutput: \u003Cbr\u003E88\u003Cbr\u003E56 \u003Cbr\u003E78 \u003Cbr\u003E90\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods \r\nToDictionary, ToLookUp\u003Cbr\u003E\u003Cp\u003Evar cars = GetCars();\u003Cbr\u003Evar carsByVin = cars.ToDictionary(c =\u003E c.VIN);\u003Cbr\u003ECar myCar = carsByVin[\"HIJ123\"];\u003Cbr\u003EtxtLog.WriteLine(\"Car VIN:{0}, Make:{1}, Model:{2} Year:{3}\",\u003Cbr\u003E myCar.VIN, myCar.Make, myCar.Model, myCar.Year);\u003Cbr\u003EOutput: \u003Cbr\u003ECar VIN:HIJ123, Make:VW, Model:Bug Year:1956\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nCast, OfType\u003Cbr\u003E\u003Cp\u003Eint[] scores = {88, 56, 23, 99, 65, 93, 78, 23, 99, 90};\u003Cbr\u003EIEnumerable\u003CObject\u003E objects = scores.Cast\u003Cobject\u003E();\u003Cbr\u003Eobject[] items = new object[] {55, \"Hello\", 22, \"Goodbye\"};\u003Cbr\u003Eforeach (var intItem in items.OfType\u003Cint\u003E())\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(intItem);\u003Cbr\u003E}\u003Cbr\u003EOutput:\u003Cbr\u003E55\u003Cbr\u003E22\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nMax, Min, Average, Sum, Count\u003Cbr\u003E\u003Cp\u003Eint[] scores = {88, 56, 23, 99, 65, 93, 78, 23, 99, 90};\u003Cbr\u003EtxtLog.WriteLine(\"Max: \" + scores.Max());\u003Cbr\u003EtxtLog.WriteLine(\"Min: \" + scores.Min());\u003Cbr\u003EtxtLog.WriteLine(\"Average: \" + scores.Average());\u003Cbr\u003EtxtLog.WriteLine(\"Sum: \" + scores.Sum());\u003Cbr\u003EtxtLog.WriteLine(\"Count: \" + scores.Count());\u003Cbr\u003EOutput:\u003Cbr\u003EMax: 99\u003Cbr\u003EMin: 23\u003Cbr\u003EAverage: 71,4\u003Cbr\u003ESum: 714\u003Cbr\u003ECount: 10\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nElementAt, First, Last\u003Cbr\u003E\u003Cp\u003Eint[] scores = {88, 56, 23, 99, 65, 93, 78, 23, 99, 90};\u003Cbr\u003EtxtLog.WriteLine(scores.ElementAt(4));\u003Cbr\u003EtxtLog.WriteLine(scores.First());\u003Cbr\u003EtxtLog.WriteLine(scores.Last());\u003Cbr\u003E\u003Cbr\u003EOutput: \u003Cbr\u003E65\u003Cbr\u003E88\u003Cbr\u003E90\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nElementAtOrDefault, FirstOrDefault, LastOrDefault\u003Cbr\u003E\u003Cp\u003Eint[] scores = {};\u003Cbr\u003EtxtLog.WriteLine(scores.ElementAtOrDefault(4));\u003Cbr\u003EtxtLog.WriteLine(scores.FirstOrDefault());\u003Cbr\u003EtxtLog.WriteLine(scores.LastOrDefault());\u003Cbr\u003E\u003Cbr\u003EOutput: \u003Cbr\u003E0\u003Cbr\u003E0\u003Cbr\u003E0\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSingle, SingleOrDefault\u003Cbr\u003E\u003Cp\u003Eint[] scores = {88, 56, 23, 99, 65, 93, 78, 23, 99, 90};\u003Cbr\u003Eint score1 = scores.Where(x =\u003E x \u003E 50 && x \u003C 60).Single();\u003Cbr\u003Eint score2 = scores.Where(x =\u003E x \u003E 100).SingleOrDefault();\u003Cbr\u003EtxtLog.WriteLine(score1);\u003Cbr\u003EtxtLog.WriteLine(score2);\u003Cbr\u003E\u003Cbr\u003EOutput: \u003Cbr\u003E56\u003Cbr\u003E0\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nDefaultIfEmpty\u003Cbr\u003E\u003Cp\u003EList\u003CCar\u003E cars = new List\u003CCar\u003E();\u003Cbr\u003EIEnumerable\u003CCar\u003E oneNullCar = cars.DefaultIfEmpty();\u003Cbr\u003Eforeach (var car in oneNullCar)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(car == null ? \"Null Car\" : \"Not Null Car\");\u003Cbr\u003E}\u003Cbr\u003EOutput: Null Car\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nContains\u003Cbr\u003E\u003Cp\u003Eint[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };\u003Cbr\u003EtxtLog.WriteLine(scores.Contains(56));\u003Cbr\u003EtxtLog.WriteLine(scores.Contains(24));\u003Cbr\u003EOutput: \u003Cbr\u003ETrue\u003Cbr\u003EFalse\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nDistinct\u003Cbr\u003E\u003Cp\u003Eint[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };\u003Cbr\u003Eforeach (var score in scores.Distinct())\u003Cbr\u003E{\u003Cbr\u003E txtLog.Write(score);\u003Cbr\u003E}\u003Cbr\u003EOutput: 88, 56, 23, 99, 65, 93, 78, 90\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nConcat\u003Cbr\u003E\u003Cp\u003Eint[] lastYearScores = { 88, 56, 23, 99, 65 };\u003Cbr\u003Eint[] thisYearScores = { 93, 78, 23, 99, 90 };\u003Cbr\u003Eforeach (var item in lastYearScores.Concat(thisYearScores))\u003Cbr\u003E{\u003Cbr\u003E txtLog.Write(item);\u003Cbr\u003E} \u003Cbr\u003EOutput: 88, 56, 23, 99, 65, 93, 78, 23, 99, 90\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nExcept\u003Cbr\u003E\u003Cp\u003Eint[] lastYearScores = { 88, 56, 23, 99, 65 };\u003Cbr\u003Eint[] thisYearScores = { 93, 78, 23, 99, 90 };\u003Cbr\u003Eforeach (var item in lastYearScores.Except(thisYearScores))\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(item);\u003Cbr\u003E}\u003Cbr\u003EOutput: \u003Cbr\u003E88\u003Cbr\u003E56 \u003Cbr\u003E65\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nIntersect\u003Cbr\u003E\u003Cp\u003Eint[] lastYearScores = { 88, 56, 23, 99, 65 };\u003Cbr\u003Eint[] thisYearScores = { 93, 78, 23, 99, 90 };\u003Cbr\u003Eforeach (var item in lastYearScores.Intersect(thisYearScores))\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(item);\u003Cbr\u003E}\u003Cbr\u003EOutput:\u003Cbr\u003E23\u003Cbr\u003E99\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nUnion\u003Cbr\u003E\u003Cp\u003Eint[] lastYearScores = { 88, 56, 23, 99, 65, 56 };\u003Cbr\u003Eint[] thisYearScores = { 93, 78, 23, 99, 90, 99 };\u003Cbr\u003Evar allScores = lastYearScores.Union(thisYearScores);\u003Cbr\u003Eforeach (var item in allScores.OrderBy(s =\u003E s))\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(item);\u003Cbr\u003E}\u003Cbr\u003EOutput: 23, 56, 65, 78, 88, 90, 93, 99\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nZip\u003Cbr\u003E\u003Cp\u003Evar numbers = Enumerable.Range(1, 1000);\u003Cbr\u003Evar cars = GetCars();\u003Cbr\u003Evar zip = numbers.Zip(cars, (i, c) =\u003E new\u003Cbr\u003E {\u003Cbr\u003E Number = i,\u003Cbr\u003E CarMake = c.Make\u003Cbr\u003E });\u003Cbr\u003Eforeach (var it in zip)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Number:{0} Make:{1}\", it.Number, it.CarMake);\u003Cbr\u003E}\u003Cbr\u003EOutput: \u003Cbr\u003ENumber:1 CarMake:Ford\u003Cbr\u003ENumber:2 CarMake:BMW \u003Cbr\u003ENumber:3 CarMake:Audi \u003Cbr\u003ENumber:4 CarMake:VW \u003Cbr\u003ENumber:5 CarMake:Ford\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nReverse\u003Cbr\u003E\u003Cp\u003Eint[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };\u003Cbr\u003Eforeach (var score in scores.Reverse())\u003Cbr\u003E{\u003Cbr\u003E txtLog.Write(score);\u003Cbr\u003E}\u003Cbr\u003EOutput: 90, 99, 23, 78, 93, 65, 99, 23, 56, 88\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSequenceEqual\u003Cbr\u003E\u003Cp\u003EList\u003Cint\u003E lastYearScores = new List\u003Cint\u003E {93, 78, 23, 99, 91};\u003Cbr\u003EList\u003Cint\u003E thisYearScores = new List\u003Cint\u003E {93, 78, 23, 99, 90};\u003Cbr\u003EtxtLog.WriteLine(lastYearScores.SequenceEqual(thisYearScores));\u003Cbr\u003ElastYearScores[4] = 90;\u003Cbr\u003EtxtLog.WriteLine(lastYearScores.SequenceEqual(thisYearScores));\u003Cbr\u003EOutput: \u003Cbr\u003EFalse\u003Cbr\u003ETrue\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSkip, SkipWhile\u003Cbr\u003E\u003Cp\u003Eint[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };\u003Cbr\u003Eforeach (var s in scores.OrderBy(i =\u003E i).Skip(9))\u003Cbr\u003E{ txtLog.WriteLine(s); }\u003Cbr\u003EOutput: 99\u003Cbr\u003Eforeach (var s in scores.OrderBy(i =\u003E i).SkipWhile(s =\u003E s \u003C 80))\u003Cbr\u003E{ txtLog.Write(s); }\u003Cbr\u003EOutput: 88, 90, 93, 99, 99\u003Cbr\u003Eforeach (var s in scores.SkipWhile(s =\u003E s \u003C 80))\u003Cbr\u003E{ txtLog.Write(s); }\u003Cbr\u003EOutput: 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 \u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nTake, TakeWhile\u003Cbr\u003E\u003Cp\u003Eint[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };\u003Cbr\u003Eforeach (var item in scores.OrderBy(i =\u003E i).Skip(3).Take(2))\u003Cbr\u003E{\u003Cbr\u003E txtLog.Write(item);\u003Cbr\u003E}\u003Cbr\u003EOutput: 65, 78\u003Cbr\u003Eforeach (var item in scores.OrderBy(i =\u003E i).TakeWhile(s =\u003E s \u003C 80))\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(item);\u003Cbr\u003E}\u003Cbr\u003EOutput: 23, 23, 56, 65, 78 \u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nGroupBy\u003Cbr\u003E\u003Cp\u003Evar cars = GetCars();\u003Cbr\u003Evar query = cars.GroupBy(c =\u003E c.Make);\u003Cbr\u003Eforeach (IGrouping\u003Cstring, Car\u003E group in query)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Key:{0}\", group.Key);\u003Cbr\u003E foreach (Car c in group)\u003Cbr\u003E { txtLog.WriteLine(\"Car VIN:{0} Make:{1}\", c.VIN, c.Make); }\u003Cbr\u003E}\u003Cbr\u003EOutput: \u003Cbr\u003EKey:Ford\u003Cbr\u003ECar VIN:ABC123 Make:Ford \u003Cbr\u003ECar VIN:DEF456 Make:Ford \u003Cbr\u003EKey:BMW \u003Cbr\u003ECar VIN:DEF123 Make:BMW \u003Cbr\u003EKey:Audi \u003Cbr\u003ECar VIN:ABC456 Make:Audi \u003Cbr\u003EKey:VW \u003Cbr\u003ECar VIN:HIJ123 Make:VW\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nOrderBy, OrderByDescending, ThenBy, ThenByDescending\u003Cbr\u003E\u003Cp\u003Evar cars = GetCars().OrderBy(c =\u003E c.Make)\u003Cbr\u003E .ThenByDescending(c =\u003E c.Model)\u003Cbr\u003E .ThenBy(c =\u003E c.Year);\u003Cbr\u003Eforeach (var item in cars)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Car VIN:{0} Make:{1} Model:{2} Year:{3}\",\u003Cbr\u003E item.VIN, item.Make, item.Model, item.Year);\u003Cbr\u003E}\u003Cbr\u003E\u003Cbr\u003EOutput:\u003Cbr\u003ECar VIN:ABC456 Make:Audi Model:TT Year:2008\u003Cbr\u003ECar VIN:DEF123 Make:BMW Model:Z-3 Year:2005 \u003Cbr\u003ECar VIN:ABC123 Make:Ford Model:F-250 Year:2000 \u003Cbr\u003ECar VIN:DEF456 Make:Ford Model:F-150 Year:1998 \u003Cbr\u003ECar VIN:HIJ123 Make:VW Model:Bug Year:1956\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nWhere\u003Cbr\u003E\u003Cp\u003Evar cars = GetCars();\u003Cbr\u003Eforeach (var myCar in cars.Where(c =\u003E c.Make == \"Ford\"))\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Car VIN:{0}, Make:{1}, Model:{2} Year:{3}\",\u003Cbr\u003E myCar.VIN, myCar.Make, myCar.Model, myCar.Year);\u003Cbr\u003E}\u003Cbr\u003E\u003Cbr\u003EOutput:\u003Cbr\u003ECar VIN:ABC123, Make:Ford, Model:F-250 Year:2000\u003Cbr\u003ECar VIN:DEF456, Make:Ford, Model:F-150 Year:1998\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSelect\u003Cbr\u003E\u003Cp\u003Evar vehicles = new List\u003CTuple\u003Cstring, string, int\u003E\u003E\u003Cbr\u003E {\u003Cbr\u003E Tuple.Create(\"123\", \"VW\", 1999),\u003Cbr\u003E Tuple.Create(\"234\", \"Ford\", 2009),\u003Cbr\u003E Tuple.Create(\"567\", \"Audi\", 2005),\u003Cbr\u003E Tuple.Create(\"678\", \"Ford\", 2003),\u003Cbr\u003E Tuple.Create(\"789\", \"Mazda\", 2003),\u003Cbr\u003E Tuple.Create(\"999\", \"Ford\", 1965)\u003Cbr\u003E };\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSelect\u003Cbr\u003E\u003Cp\u003Evar fordCars = vehicles\u003Cbr\u003E .Where(v =\u003E v.Item2 == \"Ford\")\u003Cbr\u003E .Select(v =\u003E new Car\u003Cbr\u003E {\u003Cbr\u003E VIN = v.Item1,\u003Cbr\u003E Make = v.Item2,\u003Cbr\u003E Year = v.Item3\u003Cbr\u003E });\u003Cbr\u003Eforeach (var item in fordCars)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Car VIN:{0} Make:{1} Year:{2}\",\u003Cbr\u003E item.VIN, item.Make, item.Year);\u003Cbr\u003E} \u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSelect\u003Cbr\u003E\u003Cp\u003EOutput:\u003Cbr\u003ECar VIN:234 Make:Ford Year:2009\u003Cbr\u003ECar VIN:678 Make:Ford Year:2003 \u003Cbr\u003ECar VIN:999 Make:Ford Year:1965\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSelect\u003Cbr\u003E\u003Cp\u003Evar fordCars = from v in vehicles\u003Cbr\u003E let makeYear = v.Item2 + \" \" + v.Item3\u003Cbr\u003E where makeYear.StartsWith(\"Ford\")\u003Cbr\u003E select new\u003Cbr\u003E {\u003Cbr\u003E VIN = v.Item1,\u003Cbr\u003E MakeYear = makeYear\u003Cbr\u003E };\u003Cbr\u003Eforeach (var item in fordCars)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Car VIN:{0} MakeYear:{1}\",\u003Cbr\u003E item.VIN, item.MakeYear);\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSelect\u003Cbr\u003E\u003Cp\u003EOutput:\u003Cbr\u003ECar VIN:234 MakeYear:Ford 2009\u003Cbr\u003ECar VIN:678 MakeYear:Ford 2003 \u003Cbr\u003ECar VIN:999 MakeYear:Ford 1965\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSelectMany\u003Cbr\u003E\u003Cp\u003Evar repairs = new List\u003CTuple\u003Cstring, List\u003Cstring\u003E\u003E\u003E\u003Cbr\u003E {\u003Cbr\u003E Tuple.Create(\"ABC123\",\u003Cbr\u003E new List\u003Cstring\u003E {\"Rotate Tires\", \"Change oil\"}),\u003Cbr\u003E Tuple.Create(\"DEF123\",\u003Cbr\u003E new List\u003Cstring\u003E {\"Fix Flat\", \"Wash Vehicle\"}),\u003Cbr\u003E Tuple.Create(\"ABC456\",\u003Cbr\u003E new List\u003Cstring\u003E {\"Alignment\", \"Vacuum\", \"Wax\"}),\u003Cbr\u003E Tuple.Create(\"HIJ123\",\u003Cbr\u003E new List\u003Cstring\u003E {\"Spark plugs\", \"Air filter\"}),\u003Cbr\u003E Tuple.Create(\"DEF456\",\u003Cbr\u003E new List\u003Cstring\u003E {\"Wiper blades\", \"PVC valve\"}),\u003Cbr\u003E };\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSelectMany\u003Cbr\u003E\u003Cp\u003Evar query = repairs.SelectMany(t =\u003E\u003Cbr\u003E t.Item2.Select(r =\u003E new { VIN = t.Item1, Repair = r }));\u003Cbr\u003Eforeach (var item in query)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"VIN:{0} Repair:{1}\", item.VIN, item.Repair);\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nSelectMany\u003Cbr\u003E\u003Cp\u003EOutput:\u003Cbr\u003EVIN:ABC123 Repair:Rotate Tires\u003Cbr\u003EVIN:ABC123 Repair:Change oil \u003Cbr\u003EVIN:DEF123 Repair:Fix Flat \u003Cbr\u003EVIN:DEF123 Repair:Wash Vehicle \u003Cbr\u003EVIN:ABC456 Repair:Alignment \u003Cbr\u003EVIN:ABC456 Repair:Vacuum \u003Cbr\u003EVIN:ABC456 Repair:Wax \u003Cbr\u003EVIN:HIJ123 Repair:Spark plugs \u003Cbr\u003EVIN:HIJ123 Repair:Air filter \u003Cbr\u003EVIN:DEF456 Repair:Wiper blades \u003Cbr\u003EVIN:DEF456 Repair:PVC valve\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nJoin\u003Cbr\u003E\u003Cp\u003Evar makes = new string[] { \"Audi\", \"BMW\", \"Ford\", \"Mazda\", \"VW\" };\u003Cbr\u003Evar cars = GetCars();\u003Cbr\u003Evar query = makes.Join(cars,\u003Cbr\u003E make =\u003E make, car =\u003E car.Make,\u003Cbr\u003E (make, innerCar) =\u003E new { Make = make, Car = innerCar });\u003Cbr\u003Eforeach (var item in query)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Make: {0}, Car:{1} {2} {3}\",\u003Cbr\u003E item.Make, item.Car.VIN, item.Car.Make, item.Car.Model);\u003Cbr\u003E}\u003Cbr\u003E\u003Cbr\u003EOutput:\u003Cbr\u003EMake: Audi, Car:ABC456 Audi TT\u003Cbr\u003EMake: BMW, Car:DEF123 BMW Z-3 \u003Cbr\u003EMake: Ford, Car:ABC123 Ford F-250 \u003Cbr\u003EMake: Ford, Car:DEF456 Ford F-150 \u003Cbr\u003EMake: VW, Car:HIJ123 VW Bug\u003Cbr\u003E","\u003Cp\u003EQuery Extension Methods\r\nGroupJoin\u003Cbr\u003E\u003Cp\u003Evar makes = new string[] { \"Audi\", \"BMW\", \"Ford\", \"Mazda\", \"VW\" };\u003Cbr\u003Evar cars = GetCars();\u003Cbr\u003Evar query = makes.GroupJoin(cars,\u003Cbr\u003E make =\u003E make, car =\u003E car.Make,\u003Cbr\u003E (make, innerCars) =\u003E new { Make = make, Cars = innerCars });\u003Cbr\u003Eforeach (var item in query)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Make: {0}\", item.Make);\u003Cbr\u003E foreach (var car in item.Cars)\u003Cbr\u003E { txtLog.WriteLine(\"Car VIN:{0}, Model:{1}\", car.VIN, car.Model); }\u003Cbr\u003E}\u003Cbr\u003EOutput:\u003Cbr\u003EMake: Audi\u003Cbr\u003ECar VIN:ABC456, Model:TT \u003Cbr\u003EMake: BMW \u003Cbr\u003ECar VIN:DEF123, Model:Z-3 \u003Cbr\u003EMake: Ford \u003Cbr\u003ECar VIN:ABC123, Model:F-250 \u003Cbr\u003ECar VIN:DEF456, Model:F-150\u003Cbr\u003E","\u003Cp\u003ELINQ Joins\u003Cbr\u003E\u003Cp\u003Epublic class Repair {\u003Cbr\u003E public string VIN { get; set; }\u003Cbr\u003E public string Desc { get; set; }\u003Cbr\u003E public decimal Cost { get; set; }\u003Cbr\u003E}\u003Cbr\u003Eprivate List\u003CRepair\u003E GetRepairs()\u003Cbr\u003E{\u003Cbr\u003E return new List\u003CRepair\u003E { \u003Cbr\u003E new Repair {VIN = \"ABC123\", Desc = \"Change Oil\", Cost = 29.99m},\u003Cbr\u003E new Repair {VIN = \"DEF123\", Desc = \"Rotate Tires\", Cost =19.99m}, \u003Cbr\u003E new Repair {VIN = \"HIJ123\", Desc = \"Replace Brakes\", Cost = 200}, \u003Cbr\u003E new Repair {VIN = \"DEF456\", Desc = \"Alignment\", Cost = 30}, \u003Cbr\u003E new Repair {VIN = \"ABC123\", Desc = \"Fix Flat Tire\", Cost = 15}, \u003Cbr\u003E new Repair {VIN = \"DEF123\", Desc = \"Fix Windshield\", Cost =420}, \u003Cbr\u003E new Repair {VIN = \"ABC123\", Desc = \"Replace Wipers\", Cost = 20}, \u003Cbr\u003E new Repair {VIN = \"HIJ123\", Desc = \"Replace Tires\", Cost = 1000}, \u003Cbr\u003E new Repair {VIN = \"DEF456\", Desc = \"Change Oil\", Cost = 30} };\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003ELINQ Joins\r\nInner join\u003Cbr\u003E\u003Cp\u003Evar cars = GetCars(); \u003Cbr\u003Evar repairs = GetRepairs(); \u003Cbr\u003Evar carsWithRepairs = from c in cars\u003Cbr\u003E join r in repairs\u003Cbr\u003E on c.VIN equals r.VIN\u003Cbr\u003E orderby c.VIN, r.Cost\u003Cbr\u003E select new\u003Cbr\u003E {\u003Cbr\u003E c.VIN,\u003Cbr\u003E c.Make,\u003Cbr\u003E r.Desc,\u003Cbr\u003E r.Cost\u003Cbr\u003E };\u003Cbr\u003Eforeach (var item in carsWithRepairs)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Car VIN:{0}, Make:{1}, Description:{2} Cost:{3:C}\",\u003Cbr\u003E item.VIN, item.Make, item.Desc, item.Cost);\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003ELINQ Joins\r\nInner join\u003Cbr\u003E\u003Cp\u003EOutput:\u003Cbr\u003ECar VIN:ABC123, Make:Ford, Description:Fix Flat Tire Cost:$15.00\u003Cbr\u003ECar VIN:ABC123, Make:Ford, Description:Replace Wipers Cost:$20.00 \u003Cbr\u003ECar VIN:ABC123, Make:Ford, Description:Change Oil Cost:$29.99 \u003Cbr\u003ECar VIN:DEF123, Make:BMW, Description:Rotate Tires Cost:$19.99 \u003Cbr\u003ECar VIN:DEF123, Make:BMW, Description:Fix Windshield Cost:$420.00 \u003Cbr\u003ECar VIN:DEF456, Make:Ford, Description:Alignment Cost:$30.00 \u003Cbr\u003ECar VIN:DEF456, Make:Ford, Description:Change Oil Cost:$30.00 \u003Cbr\u003ECar VIN:HIJ123, Make:VW, Description:Replace Brakes Cost:$200.00 \u003Cbr\u003ECar VIN:HIJ123, Make:VW, Description:Replace Tires Cost:$1,000.00\u003Cbr\u003E","\u003Cp\u003ELINQ Joins\r\nOuter join\u003Cbr\u003E\u003Cp\u003Evar carsWithRepairs = from c in cars\u003Cbr\u003E join r in repairs\u003Cbr\u003E on c.VIN equals r.VIN into g\u003Cbr\u003E from r in g.DefaultIfEmpty()\u003Cbr\u003E orderby c.VIN, r == null ? 0 : r.Cost\u003Cbr\u003E select new\u003Cbr\u003E {\u003Cbr\u003E c.VIN,\u003Cbr\u003E c.Make,\u003Cbr\u003E Desc = r == null ? \"***No Repairs***\" : r.Desc,\u003Cbr\u003E Cost = r == null ? 0 : r.Cost\u003Cbr\u003E };\u003Cbr\u003Eforeach (var item in carsWithRepairs)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Car VIN:{0}, Make:{1}, Description:{2} Cost:{3:C}\",\u003Cbr\u003E item.VIN, item.Make, item.Desc, item.Cost);\u003Cbr\u003E}\u003Cbr\u003E","\u003Cp\u003ELINQ Joins\r\nOuter join\u003Cbr\u003E\u003Cp\u003EOutput:\u003Cbr\u003ECar VIN:ABC123, Make:Ford, Description:Fix Flat Tire Cost:$15.00\u003Cbr\u003ECar VIN:ABC123, Make:Ford, Description:Replace Wipers Cost:$20.00 \u003Cbr\u003ECar VIN:ABC123, Make:Ford, Description:Change Oil Cost:$29.99 \u003Cbr\u003ECar VIN:ABC456, Make:Audi, Description:***No Repairs*** Cost:$0.00 \u003Cbr\u003ECar VIN:DEF123, Make:BMW, Description:Rotate Tires Cost:$19.99 \u003Cbr\u003ECar VIN:DEF123, Make:BMW, Description:Fix Windshield Cost:$420.00 \u003Cbr\u003ECar VIN:DEF456, Make:Ford, Description:Alignment Cost:$30.00 \u003Cbr\u003ECar VIN:DEF456, Make:Ford, Description:Change Oil Cost:$30.00 \u003Cbr\u003ECar VIN:HIJ123, Make:VW, Description:Replace Brakes Cost:$200.00 \u003Cbr\u003ECar VIN:HIJ123, Make:VW, Description:Replace Tires Cost:$1,000.00\u003Cbr\u003E","\u003Cp\u003ELINQ Joins\r\nCross join\u003Cbr\u003E\u003Cp\u003Evar cars = GetCars();\u003Cbr\u003Evar colors = new string[] { \"Red\", \"Blue\", \"Green\" };\u003Cbr\u003Evar carsWithRepairs = from car in cars\u003Cbr\u003E from color in colors\u003Cbr\u003E orderby car.VIN, color\u003Cbr\u003E select new\u003Cbr\u003E {\u003Cbr\u003E car.VIN,\u003Cbr\u003E car.Make,\u003Cbr\u003E car.Model,\u003Cbr\u003E Color = color\u003Cbr\u003E };\u003Cbr\u003Eforeach (var item in carsWithRepairs)\u003Cbr\u003E{\u003Cbr\u003E txtLog.WriteLine(\"Car VIN:{0}, Make:{1}, Model:{2} Color:{3}\",\u003Cbr\u003E \t item.VIN, item.Make, item.Model, item.Color);\u003Cbr\u003E} \u003Cbr\u003E","\u003Cp\u003ELINQ Joins\r\nCross join\u003Cbr\u003E\u003Cp\u003EOutput:\u003Cbr\u003ECar VIN:ABC123, Make:Ford, Model:F-250 Color:Blue\u003Cbr\u003ECar VIN:ABC123, Make:Ford, Model:F-250 Color:Green \u003Cbr\u003ECar VIN:ABC123, Make:Ford, Model:F-250 Color:Red \u003Cbr\u003ECar VIN:ABC456, Make:Audi, Model:TT Color:Blue \u003Cbr\u003ECar VIN:ABC456, Make:Audi, Model:TT Color:Green \u003Cbr\u003ECar VIN:ABC456, Make:Audi, Model:TT Color:Red \u003Cbr\u003ECar VIN:DEF123, Make:BMW, Model:Z-3 Color:Blue \u003Cbr\u003ECar VIN:DEF123, Make:BMW, Model:Z-3 Color:Green\u003Cbr\u003ECar VIN:DEF123, Make:BMW, Model:Z-3 Color:Red \u003Cbr\u003ECar VIN:DEF456, Make:Ford, Model:F-150 Color:Blue \u003Cbr\u003ECar VIN:DEF456, Make:Ford, Model:F-150 Color:Green \u003Cbr\u003ECar VIN:DEF456, Make:Ford, Model:F-150 Color:Red \u003Cbr\u003ECar VIN:HIJ123, Make:VW, Model:Bug Color:Blue \u003Cbr\u003ECar VIN:HIJ123, Make:VW, Model:Bug Color:Green \u003Cbr\u003ECar VIN:HIJ123, Make:VW, Model:Bug Color:Red \u003Cbr\u003E","\u003Cp\u003EЛитература\u003Cbr\u003E\u003Cp\u003EGlenn Johnson - Exam 70-516: TS: Accessing Data with Microsoft .NET Framework 4\u003Cbr\u003EMike Liu - WCF 4.0 Multi-tier Services Development with LINQ to Entities\u003Cbr\u003EMSDN\u003Cbr\u003E"],href:"\u002Fprezentacii-na-razlichnye-temy\u002Fvvedenie-v-linq",href_category:"\u002Fprezentacii-na-razlichnye-temy",date:1613062257,related:[{id:356498,name:"Мир бабочек",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fmir-babochek",jpg:"jpg\u002F356498"},{id:944474,name:"История возникновения платья",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fistoriya-vozniknoveniya-platya-12-2",jpg:"jpg\u002F944474"},{id:427932,name:"ОПЫТ РАЗРАБОТКИ ДОКУМЕНТАЦИИ СЗПДн. МОДЕЛЬ УГРОЗ БЕЗОПАСНОСТИ ПДн.",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fopyt-razrabotki-dokumentacii-szpdn-model-ugroz-bezopasnosti-pdn",jpg:"jpg\u002F427932"},{id:952004,name:"Типы проектов. Структура индивидуального проекта",href:"\u002Fprezentacii-na-razlichnye-temy\u002Ftipy-proektov-struktura-individualnogo-proekta-6",jpg:"jpg\u002F952004"},{id:1159364,name:"YunEk",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fyunek",jpg:"jpg\u002F1159364"},{id:272709,name:"Презентация на тему Притяжение Земли (2 класс)",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fprezentaciya-na-temu-prityazhenie-zemli-2-klass",jpg:"jpg\u002F272709"},{id:428244,name:"Устройства вывода информации",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fustrojstva-vyvoda-informacii-3",jpg:"jpg\u002F428244"},{id:1025045,name:"Социальный блоггер",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fsotsialnyy-blogger",jpg:"jpg\u002F1025045"},{id:326844,name:"Россия против Террора",href:"\u002Fprezentacii-na-razlichnye-temy\u002Frossiya-protiv-terrora",jpg:"jpg\u002F326844"},{id:1046546,name:"Call Me service. Interpretation quality",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fcall-me-service-interpretation-quality",jpg:"jpg\u002F1046546"},{id:325191,name:"Добро и зло. Понятие греха, раскаяния и воздаяния",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fdobro-i-zlo-ponyatie-grexa--raskayaniya-i-vozdayaniya",jpg:"jpg\u002F325191"},{id:373593,name:"Средства вызова подпрограмм и задач ",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fsredstva-vyzova-podprogramm-i-zadach",jpg:"jpg\u002F373593"},{id:952609,name:"Портрет школьного стрелка",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fportret-shkolnogo-strelka",jpg:"jpg\u002F952609"},{id:955205,name:"Техника метания малого мяча",href:"\u002Fprezentacii-na-razlichnye-temy\u002Ftehnika-metaniya-malogo-myacha-17",jpg:"jpg\u002F955205"},{id:294598,name:"Презентация на тему Программа \"Развитие\"",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fprezentaciya-na-temu-programma-razvitie",jpg:"jpg\u002F294598"},{id:458002,name:"Национальный исследовательский университет «МЭИ»",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fnacionalnyj-issledovatelskij-universitet-mei",jpg:"jpg\u002F458002"},{id:1041618,name:"Организация, вооружение и боевая техника мотострелкового (танкового) батальона",href:"\u002Fprezentacii-na-razlichnye-temy\u002Forganizatsiya-vooruzhenie-i-boevaya-tehnika-motostrelkovogo-1",jpg:"jpg\u002F1041618"},{id:1139001,name:"Флаги стран мира",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fflagi-stran-mira-1",jpg:"jpg\u002F1139001"},{id:304195,name:"Презентация на тему Конспект лекции по микроэкономике ",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fprezentaciya-na-temu-konspekt-lekcii-po-mikroekonomike",jpg:"jpg\u002F304195"},{id:456769,name:"360 - вчера 360+365 – завтра!",href:"\u002Fprezentacii-na-razlichnye-temy\u002F360--vchera--zavtra",jpg:"jpg\u002F456769"},{id:912378,name:"Microsoft Lumia 5000",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fmicrosoft-lumia-5000",jpg:"jpg\u002F912378"},{id:317542,name:"А.С.Грибоедов: жизнь и судьба",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fasgriboedov-zhizn-i-sudba",jpg:"jpg\u002F317542"},{id:272534,name:"Презентация на тему Керлинг",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fprezentaciya-na-temu-kerling-1",jpg:"jpg\u002F272534"},{id:1042186,name:"параграф 2 урок",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fparagraf-2-urok",jpg:"jpg\u002F1042186"},{id:323119,name:"Формирование у детей ценностного отношения к своему здоровью",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fformirovanie-u-detej-cennostnogo-otnosheniya-k-svoemu-zdorovyu",jpg:"jpg\u002F323119"},{id:304079,name:"Урок презентация Иван Сергеевич Тургенев ",href:"\u002Fprezentacii-na-razlichnye-temy\u002Furok-prezentaciya-ivan-sergeevich-turgenev",jpg:"jpg\u002F304079"},{id:338323,name:"Корпоративное обучение иностранным языкам",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fkorporativnoe-obuchenie-inostrannym-yazykam",jpg:"jpg\u002F338323"},{id:1106555,name:"Избирательная система Российской Федерации. Тема 14",href:"\u002Fprezentacii-na-razlichnye-temy\u002Fizbiratelnaya-sistema-rossiyskoy-federatsii-tema-14",jpg:"jpg\u002F1106555"}],navigation:{next:"\u002Fprezentacii-na-razlichnye-temy\u002Fnhibernate",next_name:"NHibernate ",prev:"\u002Fprezentacii-na-razlichnye-temy\u002Fthe-institute-of-semiconductor-physics",prev_name:"The Institute of Semiconductor Physics"}}},categories:{result:[{id:L,ordering:a,name:"Алгебра",pseudoname:"prezentacii-po-algebre"},{id:J,ordering:a,name:"Английский язык",pseudoname:"prezentacii-po-angliyskomu-yaziku"},{id:3,ordering:a,name:"Астрономия",pseudoname:"prezentacii-po-astronomii"},{id:4,ordering:a,name:"Биология",pseudoname:"prezentacii-po-biologii"},{id:5,ordering:a,name:"География",pseudoname:"prezentacii-po-geografii"},{id:6,ordering:a,name:"Геометрия",pseudoname:"prezentacii-po-geometrii"},{id:7,ordering:a,name:"Информатика",pseudoname:"prezentacii-po-informatike"},{id:8,ordering:a,name:"История",pseudoname:"prezentacii-po-istorii"},{id:9,ordering:a,name:"Литература",pseudoname:"prezentacii-po-literature"},{id:10,ordering:a,name:"Математика",pseudoname:"prezentacii-po-matematike"},{id:11,ordering:a,name:"Медицина",pseudoname:"prezentacii-po-medicine"},{id:h,ordering:a,name:"Музыка",pseudoname:"prezentacii-po-musice"},{id:13,ordering:a,name:"МХК",pseudoname:"prezentacii-po-mkhk"},{id:14,ordering:a,name:"ОБЖ",pseudoname:"prezentacii-po-obzh"},{id:15,ordering:a,name:"Обществознание",pseudoname:"prezentacii-po-obshhestvoznaniju"},{id:17,ordering:a,name:"Педагогика",pseudoname:"prezentacii-po-pedagogike"},{id:18,ordering:a,name:"Немецкий язык",pseudoname:"prezentacii-po-nemezkomy-yaziku"},{id:20,ordering:a,name:"Русский язык",pseudoname:"prezentacii-po-russkomu-yazyku"},{id:21,ordering:a,name:"Технология",pseudoname:"prezentacii-po-tehnologii"},{id:22,ordering:a,name:"Физика",pseudoname:"prezentacii-po-fizike"},{id:23,ordering:a,name:"Философия",pseudoname:"prezentacii-po-filosofii"},{id:24,ordering:a,name:"Химия",pseudoname:"prezentacii-po-himii"},{id:25,ordering:a,name:"Экология",pseudoname:"prezentacii-po-ehkologii"},{id:26,ordering:a,name:"Экономика",pseudoname:"prezentacii-po-ekonomike"},{id:27,ordering:a,name:"Детские презентации",pseudoname:"detskie-prezentacii"},{id:i,ordering:a,name:"Шаблоны презентаций",pseudoname:"shablony-dlya-prezentacii"},{id:29,ordering:a,name:I,pseudoname:"prezentacii-na-razlichnye-temy"},{id:48,ordering:a,name:"Культурология",pseudoname:"kulturologiya"},{id:16,ordering:L,name:"Окружающий мир",pseudoname:"prezentacii-po-okruzhayushhemu-miru"}]}},state:{},_errors:{},serverRendered:e,config:{public:{SITE_NAME:M,SITE_HOST:"slaidy.com",SITE_LANG:N,API_BASE_URL:"https:\u002F\u002Fslaidy.com\u002Fapi\u002F",pwaManifest:{name:M,short_name:b,description:b,lang:N,start_url:"\u002F?standalone=true",display:"standalone",background_color:k,theme_color:j,icons:[{src:"\u002F_nuxt\u002Ficons\u002F64x64.d7f48e96.png",type:d,sizes:O,purpose:f},{src:"\u002F_nuxt\u002Ficons\u002F64x64.maskable.d7f48e96.png",type:d,sizes:O,purpose:g},{src:"\u002F_nuxt\u002Ficons\u002F120x120.d7f48e96.png",type:d,sizes:P,purpose:f},{src:"\u002F_nuxt\u002Ficons\u002F120x120.maskable.d7f48e96.png",type:d,sizes:P,purpose:g},{src:"\u002F_nuxt\u002Ficons\u002F144x144.d7f48e96.png",type:d,sizes:Q,purpose:f},{src:"\u002F_nuxt\u002Ficons\u002F144x144.maskable.d7f48e96.png",type:d,sizes:Q,purpose:g},{src:"\u002F_nuxt\u002Ficons\u002F152x152.d7f48e96.png",type:d,sizes:R,purpose:f},{src:"\u002F_nuxt\u002Ficons\u002F152x152.maskable.d7f48e96.png",type:d,sizes:R,purpose:g},{src:"\u002F_nuxt\u002Ficons\u002F192x192.d7f48e96.png",type:d,sizes:S,purpose:f},{src:"\u002F_nuxt\u002Ficons\u002F192x192.maskable.d7f48e96.png",type:d,sizes:S,purpose:g},{src:"\u002F_nuxt\u002Ficons\u002F384x384.d7f48e96.png",type:d,sizes:T,purpose:f},{src:"\u002F_nuxt\u002Ficons\u002F384x384.maskable.d7f48e96.png",type:d,sizes:T,purpose:g},{src:"\u002F_nuxt\u002Ficons\u002F512x512.d7f48e96.png",type:d,sizes:U,purpose:f},{src:"\u002F_nuxt\u002Ficons\u002F512x512.maskable.d7f48e96.png",type:d,sizes:U,purpose:g}]},yandexMetrika:{id:"79446466",metrikaUrl:"https:\u002F\u002Fmc.yandex.ru\u002Fmetrika\u002Ftag.js",accurateTrackBounce:e,childIframe:c,clickmap:c,defer:c,useRuntimeConfig:e,trackHash:c,trackLinks:e,type:a,webvisor:c,triggerEvent:c,consoleLog:e,partytown:c,isDev:c}},app:{baseURL:"\u002F",buildAssetsDir:"\u002F_nuxt\u002F",cdnURL:b}},pinia:{app:{meta:{h1:l,main_text:b,main_title:m,main_description:n,main_keywords:o,main_image:b},app:{logo_image:p,logo_image_width:i,logo_image_height:q,logo_text:r,image_width_full:s,image_width_min:t,recaptcha_key:u,yandex_search:v,ya_context:e,banner_1:b,banner_2:b,banner_3:b,banner_4:b,banner_5:b,banner_6:b,banner_7:b,banner_8:b,banner_9:b,banner_10:b,email:w,footer_before:x,footer:y,dark_theme:c,strategy:{image_alt_words:h,item_slide_header:z,item_images:A,item_images_tag:B,item_words_h3:c,item_words_tag:C,item_words_1:h,routing:D,item_slide_skipping:E,item_download_timeout:F,item_slider_width:a,item_show_pdf:c,item_show_contents:c,item_show_filename:e},colors:{header_text:j,header_bg:k,accent:G}},social:H,token:b}}}}(0,"",false,"image\u002Fpng",true,"any","maskable",12,28,"#000000","#ffffff","Презентации, проекты, доклады в PowerPoint на любую тему","Презентации и проекты в PowerPoint","Презентации на различные темы для детей, школьников, родителей, студентов, учителей и преподавателей.","Презентация, презентация на тему, скачать презентацию, урок презентация, 1 2 3 4 5 6 7 8 9 10 11 класс","images\u002Fdata\u002Flogo.jpg",32,"Slaidy.com",720,480,"6LdhFOUnAAAAAIaOUjFtosEpzs6Ny643k1QKXXvv","3190226","[e-mail]","\u003C!--LiveInternet counter--\u003E\u003Ca href=\"https:\u002F\u002Fwww.liveinternet.ru\u002Fclick\"\r\ntarget=\"_blank\"\u003E\u003Cimg id=\"licnt7D89\" width=\"88\" height=\"31\" style=\"border:0\" \r\ntitle=\"LiveInternet: показано число просмотров за 24 часа, посетителей за 24 часа и за сегодня\"\r\nsrc=\"data:image\u002Fgif;base64,R0lGODlhAQABAIAAAAAAAP\u002F\u002F\u002FyH5BAEAAAEALAAAAAABAAEAAAIBTAA7\"\r\nalt=\"LiveInternet\"\u002F\u003E\u003C\u002Fa\u003E\u003Cscript\u003E(function(d,s){d.getElementById(\"licnt7D89\").src=\r\n\"https:\u002F\u002Fcounter.yadro.ru\u002Fhit?t12.1;r\"+escape(d.referrer)+\r\n((typeof(s)==\"undefined\")?\"\":\";s\"+s.width+\"*\"+s.height+\"*\"+\r\n(s.colorDepth?s.colorDepth:s.pixelDepth))+\";u\"+escape(d.URL)+\r\n\";h\"+escape(d.title.substring(0,150))+\";\"+Math.random()})\r\n(document,screen)\u003C\u002Fscript\u003E\u003C!--\u002FLiveInternet--\u003E","\u003Ca href=\"\u002Fpage\u002Fpravoobladateliam\"\u003EДля правообладателей\u003C\u002Fa\u003E","h3a","images_before","none","h3","category","both",77,"#ff0d00","\u003Cscript src=\"\u002F\u002Fyastatic.net\u002Fes5-shims\u002F0.0.2\u002Fes5-shims.min.js\"\u003E\u003C\u002Fscript\u003E\r\n\u003Cscript src=\"\u002F\u002Fyastatic.net\u002Fshare2\u002Fshare.js\"\u003E\u003C\u002Fscript\u003E\r\n\u003Cdiv class=\"ya-share2\" data-services=\"collections,gplus,vkontakte,facebook,odnoklassniki,gplus,twitter,moimir\" data-counter=\"\"\u003E\u003C\u002Fdiv\u003E","Разное",2,"Введение в LINQ ",1,"Slaidy","ru","64x64","120x120","144x144","152x152","192x192","384x384","512x512"))

Query Extension Methods
Max, Min, Average, Sum, Count
int[] scores = {88, 56, 23, 99, 65, 93, 78, 23, 99, 90};
txtLog.WriteLine("Max: " + scores.Max());
txtLog.WriteLine("Min: " + scores.Min());
txtLog.WriteLine("Average: " + scores.Average());
txtLog.WriteLine("Sum: " + scores.Sum());
txtLog.WriteLine("Count: " + scores.Count());
Output:
Max: 99
Min: 23
Average: 71,4
Sum: 714
Count: 10

Query Extension Methods
ElementAt, First, Last
int[] scores = {88, 56, 23, 99, 65, 93, 78, 23, 99, 90};
txtLog.WriteLine(scores.ElementAt(4));
txtLog.WriteLine(scores.First());
txtLog.WriteLine(scores.Last());
Output:
65
88
90

Query Extension Methods
ElementAtOrDefault, FirstOrDefault, LastOrDefault
int[] scores = {};
txtLog.WriteLine(scores.ElementAtOrDefault(4));
txtLog.WriteLine(scores.FirstOrDefault());
txtLog.WriteLine(scores.LastOrDefault());
Output:
0
0
0

Query Extension Methods
Single, SingleOrDefault
int[] scores = {88, 56, 23, 99, 65, 93, 78, 23, 99, 90};
int score1 = scores.Where(x => x > 50 && x < 60).Single();
int score2 = scores.Where(x => x > 100).SingleOrDefault();
txtLog.WriteLine(score1);
txtLog.WriteLine(score2);
Output:
56
0

Query Extension Methods
DefaultIfEmpty
List
cars = new List
();
IEnumerable
oneNullCar = cars.DefaultIfEmpty();
foreach (var car in oneNullCar)
{
txtLog.WriteLine(car == null ? "Null Car" : "Not Null Car");
}
Output: Null Car

Query Extension Methods
Contains
int[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };
txtLog.WriteLine(scores.Contains(56));
txtLog.WriteLine(scores.Contains(24));
Output:
True
False

Query Extension Methods
Distinct
int[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };
foreach (var score in scores.Distinct())
{
txtLog.Write(score);
}
Output: 88, 56, 23, 99, 65, 93, 78, 90

Query Extension Methods
Concat
int[] lastYearScores = { 88, 56, 23, 99, 65 };
int[] thisYearScores = { 93, 78, 23, 99, 90 };
foreach (var item in lastYearScores.Concat(thisYearScores))
{
txtLog.Write(item);
}
Output: 88, 56, 23, 99, 65, 93, 78, 23, 99, 90

Query Extension Methods
Except
int[] lastYearScores = { 88, 56, 23, 99, 65 };
int[] thisYearScores = { 93, 78, 23, 99, 90 };
foreach (var item in lastYearScores.Except(thisYearScores))
{
txtLog.WriteLine(item);
}
Output:
88
56
65

Query Extension Methods
Intersect
int[] lastYearScores = { 88, 56, 23, 99, 65 };
int[] thisYearScores = { 93, 78, 23, 99, 90 };
foreach (var item in lastYearScores.Intersect(thisYearScores))
{
txtLog.WriteLine(item);
}
Output:
23
99

Query Extension Methods
Union
int[] lastYearScores = { 88, 56, 23, 99, 65, 56 };
int[] thisYearScores = { 93, 78, 23, 99, 90, 99 };
var allScores = lastYearScores.Union(thisYearScores);
foreach (var item in allScores.OrderBy(s => s))
{
txtLog.WriteLine(item);
}
Output: 23, 56, 65, 78, 88, 90, 93, 99

Query Extension Methods
Zip
var numbers = Enumerable.Range(1, 1000);
var cars = GetCars();
var zip = numbers.Zip(cars, (i, c) => new
{
Number = i,
CarMake = c.Make
});
foreach (var it in zip)
{
txtLog.WriteLine("Number:{0} Make:{1}", it.Number, it.CarMake);
}
Output:
Number:1 CarMake:Ford
Number:2 CarMake:BMW
Number:3 CarMake:Audi
Number:4 CarMake:VW
Number:5 CarMake:Ford

Query Extension Methods
Reverse
int[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };
foreach (var score in scores.Reverse())
{
txtLog.Write(score);
}
Output: 90, 99, 23, 78, 93, 65, 99, 23, 56, 88

Query Extension Methods
SequenceEqual
List
lastYearScores = new List
{93, 78, 23, 99, 91};
List thisYearScores = new List
{93, 78, 23, 99, 90};
txtLog.WriteLine(lastYearScores.SequenceEqual(thisYearScores));
lastYearScores[4] = 90;
txtLog.WriteLine(lastYearScores.SequenceEqual(thisYearScores));
Output:
False
True

Query Extension Methods
Skip, SkipWhile
int[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };
foreach (var s in scores.OrderBy(i => i).Skip(9))
{ txtLog.WriteLine(s); }
Output: 99
foreach (var s in scores.OrderBy(i => i).SkipWhile(s => s < 80))
{ txtLog.Write(s); }
Output: 88, 90, 93, 99, 99
foreach (var s in scores.SkipWhile(s => s < 80))
{ txtLog.Write(s); }
Output: 88, 56, 23, 99, 65, 93, 78, 23, 99, 90

Query Extension Methods
Take, TakeWhile
int[] scores = { 88, 56, 23, 99, 65, 93, 78, 23, 99, 90 };
foreach (var item in scores.OrderBy(i => i).Skip(3).Take(2))
{
txtLog.Write(item);
}
Output: 65, 78
foreach (var item in scores.OrderBy(i => i).TakeWhile(s => s < 80))
{
txtLog.WriteLine(item);
}
Output: 23, 23, 56, 65, 78

Query Extension Methods
GroupBy
var cars = GetCars();
var query = cars.GroupBy(c => c.Make);
foreach (IGrouping Car> group in query)
{
txtLog.WriteLine("Key:{0}", group.Key);
foreach (Car c in group)
{ txtLog.WriteLine("Car VIN:{0} Make:{1}", c.VIN, c.Make); }
}
Output:
Key:Ford
Car VIN:ABC123 Make:Ford
Car VIN:DEF456 Make:Ford
Key:BMW
Car VIN:DEF123 Make:BMW
Key:Audi
Car VIN:ABC456 Make:Audi
Key:VW
Car VIN:HIJ123 Make:VW

Query Extension Methods
OrderBy, OrderByDescending, ThenBy, ThenByDescending
var cars = GetCars().OrderBy(c => c.Make)
.ThenByDescending(c => c.Model)
.ThenBy(c => c.Year);
foreach (var item in cars)
{
txtLog.WriteLine("Car VIN:{0} Make:{1} Model:{2} Year:{3}",
item.VIN, item.Make, item.Model, item.Year);
}
Output:
Car VIN:ABC456 Make:Audi Model:TT Year:2008
Car VIN:DEF123 Make:BMW Model:Z-3 Year:2005
Car VIN:ABC123 Make:Ford Model:F-250 Year:2000
Car VIN:DEF456 Make:Ford Model:F-150 Year:1998
Car VIN:HIJ123 Make:VW Model:Bug Year:1956

Query Extension Methods
Where
var cars = GetCars();
foreach (var myCar in cars.Where(c => c.Make == "Ford"))
{
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Model:{2} Year:{3}",
myCar.VIN, myCar.Make, myCar.Model, myCar.Year);
}
Output:
Car VIN:ABC123, Make:Ford, Model:F-250 Year:2000
Car VIN:DEF456, Make:Ford, Model:F-150 Year:1998

Query Extension Methods
Select
var vehicles = new List
>
{
Tuple.Create("123", "VW", 1999),
Tuple.Create("234", "Ford", 2009),
Tuple.Create("567", "Audi", 2005),
Tuple.Create("678", "Ford", 2003),
Tuple.Create("789", "Mazda", 2003),
Tuple.Create("999", "Ford", 1965)
};

Query Extension Methods
Select
var fordCars = vehicles
.Where(v => v.Item2 == "Ford")
.Select(v => new Car
{
VIN = v.Item1,
Make = v.Item2,
Year = v.Item3
});
foreach (var item in fordCars)
{
txtLog.WriteLine("Car VIN:{0} Make:{1} Year:{2}",
item.VIN, item.Make, item.Year);
}

Query Extension Methods
Select
Output:
Car VIN:234 Make:Ford Year:2009
Car VIN:678 Make:Ford Year:2003
Car VIN:999 Make:Ford Year:1965

Query Extension Methods
Select
var fordCars = from v in vehicles
let makeYear = v.Item2 + " " + v.Item3
where makeYear.StartsWith("Ford")
select new
{
VIN = v.Item1,
MakeYear = makeYear
};
foreach (var item in fordCars)
{
txtLog.WriteLine("Car VIN:{0} MakeYear:{1}",
item.VIN, item.MakeYear);
}

Query Extension Methods
Select
Output:
Car VIN:234 MakeYear:Ford 2009
Car VIN:678 MakeYear:Ford 2003
Car VIN:999 MakeYear:Ford 1965

Query Extension Methods
SelectMany
var repairs = new List
>>
{
Tuple.Create("ABC123",
new List {"Rotate Tires", "Change oil"}),
Tuple.Create("DEF123",
new List
{"Fix Flat", "Wash Vehicle"}),
Tuple.Create("ABC456",
new List
{"Alignment", "Vacuum", "Wax"}),
Tuple.Create("HIJ123",
new List
{"Spark plugs", "Air filter"}),
Tuple.Create("DEF456",
new List
{"Wiper blades", "PVC valve"}),
};

Query Extension Methods
SelectMany
var query = repairs.SelectMany(t =>
t.Item2.Select(r => new { VIN = t.Item1, Repair = r }));
foreach (var item in query)
{
txtLog.WriteLine("VIN:{0} Repair:{1}", item.VIN, item.Repair);
}

Query Extension Methods
SelectMany
Output:
VIN:ABC123 Repair:Rotate Tires
VIN:ABC123 Repair:Change oil
VIN:DEF123 Repair:Fix Flat
VIN:DEF123 Repair:Wash Vehicle
VIN:ABC456 Repair:Alignment
VIN:ABC456 Repair:Vacuum
VIN:ABC456 Repair:Wax
VIN:HIJ123 Repair:Spark plugs
VIN:HIJ123 Repair:Air filter
VIN:DEF456 Repair:Wiper blades
VIN:DEF456 Repair:PVC valve

Query Extension Methods
Join
var makes = new string[] { "Audi", "BMW", "Ford", "Mazda", "VW" };
var cars = GetCars();
var query = makes.Join(cars,
make => make, car => car.Make,
(make, innerCar) => new { Make = make, Car = innerCar });
foreach (var item in query)
{
txtLog.WriteLine("Make: {0}, Car:{1} {2} {3}",
item.Make, item.Car.VIN, item.Car.Make, item.Car.Model);
}
Output:
Make: Audi, Car:ABC456 Audi TT
Make: BMW, Car:DEF123 BMW Z-3
Make: Ford, Car:ABC123 Ford F-250
Make: Ford, Car:DEF456 Ford F-150
Make: VW, Car:HIJ123 VW Bug

Query Extension Methods
GroupJoin
var makes = new string[] { "Audi", "BMW", "Ford", "Mazda", "VW" };
var cars = GetCars();
var query = makes.GroupJoin(cars,
make => make, car => car.Make,
(make, innerCars) => new { Make = make, Cars = innerCars });
foreach (var item in query)
{
txtLog.WriteLine("Make: {0}", item.Make);
foreach (var car in item.Cars)
{ txtLog.WriteLine("Car VIN:{0}, Model:{1}", car.VIN, car.Model); }
}
Output:
Make: Audi
Car VIN:ABC456, Model:TT
Make: BMW
Car VIN:DEF123, Model:Z-3
Make: Ford
Car VIN:ABC123, Model:F-250
Car VIN:DEF456, Model:F-150

LINQ Joins
public class Repair {
public string VIN { get; set; } public string Desc { get; set; }
public decimal Cost { get; set; }
}
private List
GetRepairs()
{
return new List
{
new Repair {VIN = "ABC123", Desc = "Change Oil", Cost = 29.99m},
new Repair {VIN = "DEF123", Desc = "Rotate Tires", Cost =19.99m},
new Repair {VIN = "HIJ123", Desc = "Replace Brakes", Cost = 200},
new Repair {VIN = "DEF456", Desc = "Alignment", Cost = 30},
new Repair {VIN = "ABC123", Desc = "Fix Flat Tire", Cost = 15},
new Repair {VIN = "DEF123", Desc = "Fix Windshield", Cost =420},
new Repair {VIN = "ABC123", Desc = "Replace Wipers", Cost = 20},
new Repair {VIN = "HIJ123", Desc = "Replace Tires", Cost = 1000},
new Repair {VIN = "DEF456", Desc = "Change Oil", Cost = 30} };
}

LINQ Joins
Inner join
var cars = GetCars();
var repairs = GetRepairs();
var carsWithRepairs = from c in cars
join r in repairs
on c.VIN equals r.VIN
orderby c.VIN, r.Cost
select new
{
c.VIN,
c.Make,
r.Desc,
r.Cost
};
foreach (var item in carsWithRepairs)
{
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Description:{2} Cost:{3:C}",
item.VIN, item.Make, item.Desc, item.Cost);
}

LINQ Joins
Inner join
Output:
Car VIN:ABC123, Make:Ford, Description:Fix Flat Tire Cost:$15.00
Car VIN:ABC123, Make:Ford, Description:Replace Wipers Cost:$20.00
Car VIN:ABC123, Make:Ford, Description:Change Oil Cost:$29.99
Car VIN:DEF123, Make:BMW, Description:Rotate Tires Cost:$19.99
Car VIN:DEF123, Make:BMW, Description:Fix Windshield Cost:$420.00
Car VIN:DEF456, Make:Ford, Description:Alignment Cost:$30.00
Car VIN:DEF456, Make:Ford, Description:Change Oil Cost:$30.00
Car VIN:HIJ123, Make:VW, Description:Replace Brakes Cost:$200.00
Car VIN:HIJ123, Make:VW, Description:Replace Tires Cost:$1,000.00

LINQ Joins
Outer join
var carsWithRepairs = from c in cars
join r in repairs
on c.VIN equals r.VIN into g
from r in g.DefaultIfEmpty()
orderby c.VIN, r == null ? 0 : r.Cost
select new
{
c.VIN,
c.Make,
Desc = r == null ? "***No Repairs***" : r.Desc,
Cost = r == null ? 0 : r.Cost
};
foreach (var item in carsWithRepairs)
{
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Description:{2} Cost:{3:C}",
item.VIN, item.Make, item.Desc, item.Cost);
}

LINQ Joins
Outer join
Output:
Car VIN:ABC123, Make:Ford, Description:Fix Flat Tire Cost:$15.00
Car VIN:ABC123, Make:Ford, Description:Replace Wipers Cost:$20.00
Car VIN:ABC123, Make:Ford, Description:Change Oil Cost:$29.99
Car VIN:ABC456, Make:Audi, Description:***No Repairs*** Cost:$0.00
Car VIN:DEF123, Make:BMW, Description:Rotate Tires Cost:$19.99
Car VIN:DEF123, Make:BMW, Description:Fix Windshield Cost:$420.00
Car VIN:DEF456, Make:Ford, Description:Alignment Cost:$30.00
Car VIN:DEF456, Make:Ford, Description:Change Oil Cost:$30.00
Car VIN:HIJ123, Make:VW, Description:Replace Brakes Cost:$200.00
Car VIN:HIJ123, Make:VW, Description:Replace Tires Cost:$1,000.00

LINQ Joins
Cross join
var cars = GetCars();
var colors = new string[] { "Red", "Blue", "Green" };
var carsWithRepairs = from car in cars
from color in colors
orderby car.VIN, color
select new
{
car.VIN,
car.Make,
car.Model,
Color = color
};
foreach (var item in carsWithRepairs)
{
txtLog.WriteLine("Car VIN:{0}, Make:{1}, Model:{2} Color:{3}",
item.VIN, item.Make, item.Model, item.Color);
}

LINQ Joins
Cross join
Output:
Car VIN:ABC123, Make:Ford, Model:F-250 Color:Blue
Car VIN:ABC123, Make:Ford, Model:F-250 Color:Green
Car VIN:ABC123, Make:Ford, Model:F-250 Color:Red
Car VIN:ABC456, Make:Audi, Model:TT Color:Blue
Car VIN:ABC456, Make:Audi, Model:TT Color:Green
Car VIN:ABC456, Make:Audi, Model:TT Color:Red
Car VIN:DEF123, Make:BMW, Model:Z-3 Color:Blue
Car VIN:DEF123, Make:BMW, Model:Z-3 Color:Green
Car VIN:DEF123, Make:BMW, Model:Z-3 Color:Red
Car VIN:DEF456, Make:Ford, Model:F-150 Color:Blue
Car VIN:DEF456, Make:Ford, Model:F-150 Color:Green
Car VIN:DEF456, Make:Ford, Model:F-150 Color:Red
Car VIN:HIJ123, Make:VW, Model:Bug Color:Blue
Car VIN:HIJ123, Make:VW, Model:Bug Color:Green
Car VIN:HIJ123, Make:VW, Model:Bug Color:Red