Computes in parallel the sum of the sequence of values that are obtained
by invoking a transform function on each element of the input sequence.
Namespace:
System.Linq
Assembly:
System.Threading (in System.Threading.dll)
Syntax
| Visual Basic (Declaration) |
|---|
Public Shared Function Sum(Of TSource) ( _
source As ParallelQuery(Of TSource), _
selector As Func(Of TSource, Nullable(Of Integer)) _
) As Nullable(Of Integer) |
| C# |
|---|
public static Nullable<int> Sum<TSource>(
ParallelQuery<TSource> source,
Func<TSource, Nullable<int>> selector
)
|
Parameters
- source
- Type: System.Linq..::.ParallelQuery<(Of <(TSource>)>)
A sequence of values to calculate the sum of.
- selector
- Type: System..::.Func<(Of <(TSource, Nullable<(Of <(Int32>)>)>)>)
A transform function to apply to each element.
Type Parameters
- TSource
- The type of elements of source.
Return Value
The sum of the values in the sequence.
Exceptions
| Exception | Condition |
|---|
| System..::.ArgumentNullException |
source or selector is a null reference (Nothing in Visual Basic).
|
| System..::.AggregateException |
The sum is larger than MaxValue()()().
-or-
One or more exceptions occurred during the evaluation of the query.
|
| System..::.OperationCanceledException |
The query was canceled.
|
See Also
