ParallelEnumerable.LastOrDefault(Of TSource) Method (ParallelQuery(Of TSource), Func(Of TSource, Boolean))
Returns the last element of a parallel sequence that satisfies a condition, or a default value if no such element is found.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Function LastOrDefault(Of TSource) ( source As ParallelQuery(Of TSource), predicate As Func(Of TSource, Boolean) ) As TSource
Parameters
- source
-
Type:
System.Linq.ParallelQuery(Of TSource)
The sequence to return an element from.
- predicate
-
Type:
System.Func(Of TSource, Boolean)
A function to test each element for a condition.
Return Value
Type: TSourcedefault() if the sequence is empty or if no elements pass the test in the predicate function; otherwise, the last element that passes the test in the predicate function.
Type Parameters
- TSource
The type of the elements of source.
| Exception | Condition |
|---|---|
| OperationCanceledException | The query was canceled with the token passed in through WithCancellation. |
| ArgumentNullException | source or predicate is a null reference (Nothing in Visual Basic). |
| AggregateException | One or more exceptions occurred during the evaluation of the query. |
If the query is not ordered, then the last element is non-deterministic. For more information, see Order Preservation in PLINQ.
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1