Queryable.AsQueryable Yöntem

Tanım

Ad Alanı:

System.Linq

Bütünleştirilmiş Kodlar:

netstandard.dll, System.Linq.Queryable.dll

Aşırı Yüklemeler

Name	Description
AsQueryable(IEnumerable)	bir IEnumerable öğesine IQueryabledönüştürür.
AsQueryable<TElement>(IEnumerable<TElement>)	Bir geneli genele IEnumerable<T>IQueryable<T>dönüştürür.

AsQueryable(IEnumerable)

Kaynak:

Queryable.cs

bir IEnumerable öğesine IQueryabledönüştürür.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable ^ AsQueryable(System::Collections::IEnumerable ^ source);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating in-memory collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Enumerating in-memory collections as IQueryable can require unreferenced code because expressions referencing IQueryable extension methods can get rebound to IEnumerable extension methods. The IEnumerable extension methods could be trimmed causing the application to fail at runtime.")]
public static System.Linq.IQueryable AsQueryable(this System.Collections.IEnumerable source);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating in-memory collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Enumerating in-memory collections as IQueryable can require unreferenced code because expressions referencing IQueryable extension methods can get rebound to IEnumerable extension methods. The IEnumerable extension methods could be trimmed causing the application to fail at runtime.")>]
static member AsQueryable : System.Collections.IEnumerable -> System.Linq.IQueryable

<Extension()>
Public Function AsQueryable (source As IEnumerable) As IQueryable

Parametreler

source

IEnumerable

Dönüştürülecek bir dizi.

Döndürülenler

IQueryable

IQueryable Giriş dizisini temsil eden bir.

Öznitelikler

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

Özel durumlar

ArgumentException

sourcebazı IEnumerable<T>için uygulamazT.

ArgumentNullException

source, null'e eşittir.

Açıklamalar

türü source uygularsaIQueryable<T>AsQueryable(IEnumerable), doğrudan döndürür. Aksi takdirde, içindekiler yerine IQueryable<T>içindeki Enumerable eşdeğer sorgu işleci yöntemlerini çağırarak sorguları yürüten bir Queryable döndürür.

Bu yöntem, bazı sourceiçin IEnumerable<T> uyguladığını T varsayar. Çalışma zamanında, sonuç aynı IQueryable<T>türünde T olur. Bu yöntem, türünü Tstatik olarak bilmediğiniz dinamik senaryolarda kullanışlıdır.

AsQueryable<TElement>(IEnumerable<TElement>)

Kaynak:

Queryable.cs

Bir geneli genele IEnumerable<T>IQueryable<T>dönüştürür.

public:
generic <typename TElement>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable<TElement> ^ AsQueryable(System::Collections::Generic::IEnumerable<TElement> ^ source);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating in-memory collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Enumerating in-memory collections as IQueryable can require unreferenced code because expressions referencing IQueryable extension methods can get rebound to IEnumerable extension methods. The IEnumerable extension methods could be trimmed causing the application to fail at runtime.")]
public static System.Linq.IQueryable<TElement> AsQueryable<TElement>(this System.Collections.Generic.IEnumerable<TElement> source);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating in-memory collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Enumerating in-memory collections as IQueryable can require unreferenced code because expressions referencing IQueryable extension methods can get rebound to IEnumerable extension methods. The IEnumerable extension methods could be trimmed causing the application to fail at runtime.")>]
static member AsQueryable : seq<'Element> -> System.Linq.IQueryable<'Element>

<Extension()>
Public Function AsQueryable(Of TElement) (source As IEnumerable(Of TElement)) As IQueryable(Of TElement)

Tür Parametreleri

TElement

öğelerinin sourcetürü.

Parametreler

source

IEnumerable<TElement>

Dönüştürülecek bir dizi.

Döndürülenler

IQueryable<TElement>

IQueryable<T> Giriş dizisini temsil eden bir.

Öznitelikler

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

Özel durumlar

ArgumentNullException

source, null'e eşittir.

Örnekler

Aşağıdaki kod örneği, bir AsQueryable<TElement>(IEnumerable<TElement>)IEnumerable<T>'i 'ye dönüştürmek için nasıl kullanılacağını IQueryable<T> gösterir.

List<int> grades = new List<int> { 78, 92, 100, 37, 81 };

// Convert the List to an IQueryable<int>.
IQueryable<int> iqueryable = grades.AsQueryable();

// Get the Expression property of the IQueryable object.
System.Linq.Expressions.Expression expressionTree =
    iqueryable.Expression;

Console.WriteLine("The NodeType of the expression tree is: "
    + expressionTree.NodeType.ToString());
Console.WriteLine("The Type of the expression tree is: "
    + expressionTree.Type.Name);

/*
    This code produces the following output:

    The NodeType of the expression tree is: Constant
    The Type of the expression tree is: EnumerableQuery`1
*/

Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

' Convert the List to an IQueryable<int>.
Dim iqueryable As IQueryable(Of Integer) = grades.AsQueryable()

' Get the Expression property of the IQueryable object.
Dim expressionTree As System.Linq.Expressions.Expression = _
    iqueryable.Expression

MsgBox("The NodeType of the expression tree is: " _
    & expressionTree.NodeType.ToString())
MsgBox("The Type of the expression tree is: " _
    & expressionTree.Type.Name)

' This code produces the following output:
'
' The NodeType of the expression tree is: Constant
' The Type of the expression tree is: EnumerableQuery`1

Açıklamalar

türü source uygularsaIQueryable<T>AsQueryable<TElement>(IEnumerable<TElement>), doğrudan döndürür. Aksi takdirde, içindekiler yerine IQueryable<T>içindeki Enumerable eşdeğer sorgu işleci yöntemlerini çağırarak sorguları yürüten bir Queryable döndürür.