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Queryable.AsQueryable Method (IEnumerable)

Converts an IEnumerable to an IQueryable.

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

public static IQueryable AsQueryable(
	this IEnumerable source
)

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).

ExceptionCondition
ArgumentException

source does not implement IEnumerable<T> for some T.

ArgumentNullException

source is null.

If the type of source implements IQueryable<T>, AsQueryable(IEnumerable) returns it directly. Otherwise, it returns an IQueryable<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<T> for some T. At runtime, the result is of type IQueryable<T> for the same T. This method is useful in dynamic scenarios when you do not statically know the type of T.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, 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.

.NET Framework

Supported in: 3.5

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