Queryable.AsQueryable Method (IEnumerable) (System.Linq)

AsQueryable Method (IEnumerable)

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.NET Framework Class Library

Queryable..::.AsQueryable Method (IEnumerable)

Updated: November 2007

Converts an IEnumerable to an IQueryable.

Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)

Syntax

Visual Basic (Declaration)

<ExtensionAttribute> _
Public Shared Function AsQueryable ( _
    source As IEnumerable _
) As IQueryable

Visual Basic (Usage)

Dim source As IEnumerable
Dim returnValue As IQueryable

returnValue = source.AsQueryable()

public static IQueryable AsQueryable(
    this IEnumerable source
)

Visual C++

[ExtensionAttribute]
public:
static IQueryable^ AsQueryable(
    IEnumerable^ source
)

/** @attribute ExtensionAttribute */
public static IQueryable AsQueryable(
    IEnumerable source
)

JScript

public static function AsQueryable(
    source : IEnumerable
) : IQueryable

Parameters

source: Type: System.Collections..::.IEnumerable
A sequence to convert.

Return Value

Type: System.Linq..::.IQueryable

An IQueryable that represents the input sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Exceptions

Exception	Condition
ArgumentException	source does not implement IEnumerable<(Of <(T>)>) for some T.
ArgumentNullException	source is nullNothingnullptra null reference (Nothing in Visual Basic).

Remarks

If the type of source implements IQueryable<(Of <(T>)>), AsQueryable(IEnumerable) returns it directly. Otherwise, it returns an IQueryable<(Of <(T>)>) that executes queries by calling the equivalent query operator methods in Enumerable instead of those in Queryable.

This method assumes that source implements IEnumerable<(Of <(T>)>) for some T. At runtime, the result is of type IQueryable<(Of <(T>)>) for the same T. This method is useful in dynamic scenarios when you do not statically know the type of T.

Platforms

Windows Vista, Windows XP SP2, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information