ParallelEnumerable::ToDictionary<TSource, TKey> Method (ParallelQuery<TSource>^, Func<TSource, TKey>^)
Creates a Dictionary<TKey, TValue> from a ParallelQuery<TSource> according to a specified key selector function.
Assembly: System.Core (in System.Core.dll)
public: generic<typename TSource, typename TKey> [ExtensionAttribute] static Dictionary<TKey, TSource>^ ToDictionary( ParallelQuery<TSource>^ source, Func<TSource, TKey>^ keySelector )
Parameters
- source
-
Type:
System.Linq::ParallelQuery<TSource>^
A sequence to create a Dictionary<TKey, TValue> from.
- keySelector
-
Type:
System::Func<TSource, TKey>^
A function to extract a key from each element.
Return Value
Type: System.Collections.Generic::Dictionary<TKey, TSource>^A Dictionary<TKey, TValue> that contains keys and values.
Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of the key returned by keySelector.
| Exception | Condition |
|---|---|
| OperationCanceledException | The query was canceled with the token passed in through WithCancellation. |
| ArgumentNullException | source or keySelector is a null reference (Nothing in Visual Basic). |
| 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. |
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1