Enumerable.AsEnumerable(TSource) Method
Returns the input typed as IEnumerable(T).
Assembly: System.Core (in System.Core.dll)
Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- Type: System.Collections.Generic.IEnumerable(TSource)
The sequence to type as IEnumerable(T).
Return Value
Type: System.Collections.Generic.IEnumerable(TSource)The input sequence typed as IEnumerable(T).
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(TSource). 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).The AsEnumerable(TSource)(IEnumerable(TSource)) method has no effect other than to change the compile-time type of source from a type that implements IEnumerable(T) to IEnumerable(T) itself.
AsEnumerable(TSource)(IEnumerable(TSource)) can be used to choose between query implementations when a sequence implements IEnumerable(T) but also has a different set of public query methods available. For example, given a generic class Table that implements IEnumerable(T) and has its own methods such as Where, Select, and SelectMany, a call to Where would invoke the public Where method of Table. A Table type that represents a database table could have a Where method that takes the predicate argument as an expression tree and converts the tree to SQL for remote execution. If remote execution is not desired, for example because the predicate invokes a local method, the AsEnumerable(TSource) method can be used to hide the custom methods and instead make the standard query operators available.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.