Queryable::Cast<TResult> Method
Converts the elements of an IQueryable to the specified type.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
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.| 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.
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