Returns the elements of the specified parallel sequence or the specified value
in a singleton collection if the sequence is empty.
Namespace:
System.Linq
Assembly:
System.Threading (in System.Threading.dll)
Syntax
| Visual Basic (Declaration) |
|---|
Public Shared Function DefaultIfEmpty(Of TSource) ( _
source As ParallelQuery(Of TSource), _
defaultValue As TSource _
) As ParallelQuery(Of TSource) |
Parameters
- source
- Type: System.Linq..::.ParallelQuery<(Of <(TSource>)>)
The sequence to return the specified value for if it is empty.
- defaultValue
- Type: TSource
The value to return if the sequence is empty.
Type Parameters
- TSource
- The type of the elements of source.
Return Value
A sequence that contains defaultValue if
source is empty; otherwise,
source.
Exceptions
| Exception | Condition |
|---|
| System..::.ArgumentNullException |
source is a null reference (Nothing in Visual Basic).
|
See Also
