Queryable::Cast<TResult> Method
Converts the elements of an IQueryable to the specified type.
Assembly: System.Core (in System.Core.dll)
[ExtensionAttribute] public: generic<typename TResult> static IQueryable<TResult>^ Cast( IQueryable^ source )
Type Parameters
- TResult
The type to convert the elements of source to.
Parameters
- source
- Type: System.Linq::IQueryable
The IQueryable that contains the elements to be converted.
Return Value
Type: System.Linq::IQueryable<TResult>An IQueryable<T> that contains each element of the source sequence converted to the specified type.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryable. 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).| Exception | Condition |
|---|---|
| ArgumentNullException | source is nullptr. |
| InvalidCastException | An element in the sequence cannot be cast to type TResult. |
The Cast<TResult>(IQueryable) method generates a MethodCallExpression that represents calling Cast<TResult>(IQueryable) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.
The query behavior that occurs as a result of executing an expression tree that represents calling Cast<TResult>(IQueryable) depends on the implementation of the type of the source parameter. The expected behavior is that it converts the values in source to type TResult.
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.