Creates a Dictionary{TKey,TValue} from a ParallelQuery{T} according to a
specified key selector function and key comparer.
Namespace:
System.Linq
Assembly:
System.Threading (in System.Threading.dll)
Syntax
| Visual Basic (Declaration) |
|---|
Public Shared Function ToDictionary(Of TSource, TKey) ( _
source As ParallelQuery(Of TSource), _
keySelector As Func(Of TSource, TKey), _
comparer As IEqualityComparer(Of TKey) _
) As Dictionary(Of TKey, TSource) |
| C# |
|---|
public static Dictionary<TKey, TSource> ToDictionary<TSource, TKey>(
ParallelQuery<TSource> source,
Func<TSource, TKey> keySelector,
IEqualityComparer<TKey> comparer
)
|
Parameters
- source
- Type: System.Linq..::.ParallelQuery<(Of <(TSource>)>)
A sequence to create a Dictionary<(Of <(TKey, TValue>)>) from.
- keySelector
- Type: System..::.Func<(Of <(TSource, TKey>)>)
A function to extract a key from each element.
- comparer
- Type: System.Collections.Generic..::.IEqualityComparer<(Of <(TKey>)>)
An IEqualityComparer<(Of <(T>)>) to compare keys.
Type Parameters
- TSource
- The type of the elements of source.
- TKey
- The type of the key returned by keySelector.
Return Value
A Dictionary<(Of <(TKey, TValue>)>) that contains keys and values.
Exceptions
| Exception | Condition |
|---|
| System..::.ArgumentNullException |
source or keySelector is a null reference (Nothing in Visual Basic).
|
| System..::.AggregateException |
keySelector produces a key that is a null reference (Nothing in Visual Basic).
-or-
keySelector produces duplicate keys for two elements.
-or-
One or more exceptions occurred during the evaluation of the query.
|
| System..::.OperationCanceledException |
The query was canceled.
|
See Also
