Creates a Dictionary{TKey,TValue} from a ParallelQuery{T} according to specified
key selector and element selector functions.
Namespace:
System.Linq
Assembly:
System.Threading (in System.Threading.dll)
Syntax
| Visual Basic (Declaration) |
|---|
Public Shared Function ToDictionary(Of TSource, TKey, TElement) ( _
source As ParallelQuery(Of TSource), _
keySelector As Func(Of TSource, TKey), _
elementSelector As Func(Of TSource, TElement) _
) As Dictionary(Of TKey, TElement) |
| C# |
|---|
public static Dictionary<TKey, TElement> ToDictionary<TSource, TKey, TElement>(
ParallelQuery<TSource> source,
Func<TSource, TKey> keySelector,
Func<TSource, TElement> elementSelector
)
|
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.
- elementSelector
- Type: System..::.Func<(Of <(TSource, TElement>)>)
A transform function to produce a result element value from each element.
Type Parameters
- TSource
- The type of the elements of source.
- TKey
- The type of the key returned by keySelector.
- TElement
- The type of the value returned by elementSelector.
Return Value
A Dictionary<(Of <(TKey, TValue>)>) that contains values of type
TElement
selected from the input sequence
Exceptions
| Exception | Condition |
|---|
| System..::.ArgumentNullException |
source or keySelector or elementSelector 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
