ParallelEnumerable::TakeWhile<TSource> Method (ParallelQuery<TSource>^, Func<TSource, Int32, Boolean>^)
Returns elements from a parallel sequence as long as a specified condition is true. The element's index is used in the logic of the predicate function.
Assembly: System.Core (in System.Core.dll)
public: generic<typename TSource> [ExtensionAttribute] static ParallelQuery<TSource>^ TakeWhile( ParallelQuery<TSource>^ source, Func<TSource, int, bool>^ predicate )
Parameters
- source
-
Type:
System.Linq::ParallelQuery<TSource>^
The sequence to return elements from.
- predicate
-
Type:
System::Func<TSource, Int32, Boolean>^
A function to test each source element for a condition; the second parameter of the function represents the index of the source element.
Return Value
Type: System.Linq::ParallelQuery<TSource>^A sequence that contains elements from the input sequence that occur before the element at which the test no longer passes.
Type Parameters
- TSource
The type of elements of source.
| Exception | Condition |
|---|---|
| ArgumentNullException | source or predicate is a null reference (Nothing in Visual Basic). |
| OperationCanceledException | The query was canceled with the token passed in through WithCancellation. |
| OverflowException | More than MaxValue elements are enumerated by this query. |
| AggregateException | One or more exceptions occurred during the evaluation of the query. |
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1