ParallelEnumerable.TakeWhile(Of TSource) Method (ParallelQuery(Of TSource), Func(Of TSource, Boolean))
Returns elements from a parallel sequence as long as a specified condition is true.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
'Declaration <ExtensionAttribute> _ Public Shared Function TakeWhile(Of TSource) ( _ source As ParallelQuery(Of TSource), _ predicate As Func(Of TSource, Boolean) _ ) As ParallelQuery(Of TSource)
Type Parameters
- TSource
The type of elements of source.
Parameters
- source
- Type: System.Linq.ParallelQuery(Of TSource)
The sequence to return elements from.
- predicate
- Type: System.Func(Of TSource, Boolean)
A function to test each element for a condition.
Return Value
Type: System.Linq.ParallelQuery(Of TSource)A sequence that contains the elements from the input sequence that occur before the element at which the test no longer passes.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery(Of 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).| 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. |
| AggregateException | One or more exceptions occurred during the evaluation of the query. |
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
