Returns the first element of a parallel sequence, or a default value if the
sequence contains no elements.
Namespace:
System.Linq
Assembly:
System.Threading (in System.Threading.dll)
Syntax
| Visual Basic (Declaration) |
|---|
Public Shared Function FirstOrDefault(Of TSource) ( _
source As ParallelQuery(Of TSource) _
) As TSource |
| C# |
|---|
public static TSource FirstOrDefault<TSource>(
ParallelQuery<TSource> source
)
|
Type Parameters
- TSource
- The type of the elements of source.
Return Value
default(TSource) if
source is empty; otherwise, the first element in
source.
Exceptions
| Exception | Condition |
|---|
| System..::.ArgumentNullException |
source is a null reference (Nothing in Visual Basic).
|
| System..::.AggregateException |
One or more exceptions occurred during the evaluation of the query.
|
| System..::.OperationCanceledException |
The query was canceled.
|
See Also
