Queryable.Take メソッド

ソース:

Queryable.cs

ソース:

Queryable.cs

ソース:

Queryable.cs

ソース:

Queryable.cs

ソース:

Queryable.cs

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable<TSource> ^ Take(System::Linq::IQueryable<TSource> ^ source, int count);

public static System.Linq.IQueryable<TSource> Take<TSource>(this System.Linq.IQueryable<TSource> source, int count);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
public static System.Linq.IQueryable<TSource> Take<TSource>(this System.Linq.IQueryable<TSource> source, int count);

static member Take : System.Linq.IQueryable<'Source> * int -> System.Linq.IQueryable<'Source>

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")>]
static member Take : System.Linq.IQueryable<'Source> * int -> System.Linq.IQueryable<'Source>

<Extension()>
Public Function Take(Of TSource) (source As IQueryable(Of TSource), count As Integer) As IQueryable(Of TSource)

型パラメーター

パラメーター

戻り値

sourceの先頭から指定した数の要素を含むIQueryable<T>。

属性

RequiresDynamicCodeAttribute

例外

例

次のコード例では、 Take<TSource>(IQueryable<TSource>, Int32) を使用してシーケンスの先頭から要素を返す方法を示します。

int[] grades = { 59, 82, 70, 56, 92, 98, 85 };

// Sort the grades in descending order and take the first three.
IEnumerable<int> topThreeGrades =
    grades.AsQueryable().OrderByDescending(grade => grade).Take(3);

Console.WriteLine("The top three grades are:");
foreach (int grade in topThreeGrades)
    Console.WriteLine(grade);

/*
    This code produces the following output:

    The top three grades are:
    98
    92
    85
*/

Dim grades() As Integer = {59, 82, 70, 56, 92, 98, 85}

' Sort the grades in descending order and take the first three.
Dim topThreeGrades = _
    grades.AsQueryable().OrderByDescending(Function(grade) grade).Take(3)

Dim output As New System.Text.StringBuilder
output.AppendLine("The top three grades are:")
For Each grade As Integer In topThreeGrades
    output.AppendLine(grade)
Next

' Display the output.
MsgBox(output.ToString())

' This code produces the following output:

' The top three grades are:
' 98
' 92
' 85

注釈

Take<TSource>(IQueryable<TSource>, Int32) メソッドは、構築されたジェネリック メソッドとしての呼び出しTake<TSource>(IQueryable<TSource>, Int32)自体を表すMethodCallExpressionを生成します。 次に、source パラメーターのProvider プロパティで表されるIQueryProviderのCreateQuery(Expression) メソッドにMethodCallExpressionを渡します。

呼び出し Take<TSource>(IQueryable<TSource>, Int32) を表す式ツリーを実行した結果として発生するクエリ動作は、 source パラメーターの型の実装によって異なります。 想定される動作は、sourceの先頭から最初のcount要素を受け取ります。

ソース:

Queryable.cs

ソース:

Queryable.cs

ソース:

Queryable.cs

ソース:

Queryable.cs

ソース:

Queryable.cs

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable<TSource> ^ Take(System::Linq::IQueryable<TSource> ^ source, Range range);

public static System.Linq.IQueryable<TSource> Take<TSource>(this System.Linq.IQueryable<TSource> source, Range range);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
public static System.Linq.IQueryable<TSource> Take<TSource>(this System.Linq.IQueryable<TSource> source, Range range);

static member Take : System.Linq.IQueryable<'Source> * Range -> System.Linq.IQueryable<'Source>

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")>]
static member Take : System.Linq.IQueryable<'Source> * Range -> System.Linq.IQueryable<'Source>

<Extension()>
Public Function Take(Of TSource) (source As IQueryable(Of TSource), range As Range) As IQueryable(Of TSource)

型パラメーター

パラメーター

戻り値

source シーケンスの要素の指定したrangeを含むIQueryable<T>。

属性

RequiresDynamicCodeAttribute

例外