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ParallelEnumerable.ToLookup Method
Definition
- Namespace:
- System.Linq
- Assemblies:
- System.Core.dll, System.Linq.Parallel.dll
- Assemblies:
- netstandard.dll, System.Linq.Parallel.dll
- Assembly:
- System.Linq.Parallel.dll
- Assembly:
- System.Core.dll
- Assembly:
- netstandard.dll
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource>.
Overloads
| Name | Description |
|---|---|
| ToLookup<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>) |
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource> according to a specified key selector function, a comparer and an element selector function. |
| ToLookup<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>) |
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource> according to specified key selector and element selector functions. |
| ToLookup<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>) |
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource> according to a specified key selector function and key comparer. |
| ToLookup<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>) |
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource> according to a specified key selector function. |
ToLookup<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource> according to a specified key selector function, a comparer and an element selector function.
public:
generic <typename TSource, typename TKey, typename TElement>
[System::Runtime::CompilerServices::Extension]
static System::Linq::ILookup<TKey, TElement> ^ ToLookup(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector, Func<TSource, TElement> ^ elementSelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);public static System.Linq.ILookup<TKey,TElement> ToLookup<TSource,TKey,TElement>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);public static System.Linq.ILookup<TKey,TElement> ToLookup<TSource,TKey,TElement>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer);static member ToLookup : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Linq.ILookup<'Key, 'Element><Extension()>
Public Function ToLookup(Of TSource, TKey, TElement) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement), comparer As IEqualityComparer(Of TKey)) As ILookup(Of TKey, TElement)Type Parameters
- TSource
The type of elements of source.
- TKey
The type of the key returned by keySelector.
- TElement
The type of the value returned by elementSelector.
Parameters
- source
- ParallelQuery<TSource>
The sequence to create a ILookup<TKey,TElement> from.
- keySelector
- Func<TSource,TKey>
A function to extract a key from each element.
- elementSelector
- Func<TSource,TElement>
A transform function to produce a result element value from each element.
- comparer
- IEqualityComparer<TKey>
An IEqualityComparer<T> to compare keys.
Returns
A Lookup<(Of <(TKey, TElement>)>) that contains values of type TElement selected from the input sequence.
Exceptions
The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).
source or keySelector or elementSelector is a null reference (Nothing in Visual Basic).
One or more exceptions occurred during the evaluation of the query.
See also
Applies to
ToLookup<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource> according to specified key selector and element selector functions.
public:
generic <typename TSource, typename TKey, typename TElement>
[System::Runtime::CompilerServices::Extension]
static System::Linq::ILookup<TKey, TElement> ^ ToLookup(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector, Func<TSource, TElement> ^ elementSelector);public static System.Linq.ILookup<TKey,TElement> ToLookup<TSource,TKey,TElement>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector);static member ToLookup : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> -> System.Linq.ILookup<'Key, 'Element><Extension()>
Public Function ToLookup(Of TSource, TKey, TElement) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement)) As ILookup(Of TKey, TElement)Type Parameters
- TSource
The type of elements of source.
- TKey
The type of the key returned by keySelector.
- TElement
The type of the value returned by elementSelector.
Parameters
- source
- ParallelQuery<TSource>
The sequence to create a ILookup<TKey,TElement> from.
- keySelector
- Func<TSource,TKey>
A function to extract a key from each element.
- elementSelector
- Func<TSource,TElement>
A transform function to produce a result element value from each element.
Returns
A ILookup<TKey,TElement> that contains values of type TElement selected from the input sequence.
Exceptions
The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).
source or keySelector or elementSelector is a null reference (Nothing in Visual Basic).
One or more exceptions occurred during the evaluation of the query.
See also
Applies to
ToLookup<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource> according to a specified key selector function and key comparer.
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static System::Linq::ILookup<TKey, TSource> ^ ToLookup(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);public static System.Linq.ILookup<TKey,TSource> ToLookup<TSource,TKey>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);public static System.Linq.ILookup<TKey,TSource> ToLookup<TSource,TKey>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer);static member ToLookup : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Linq.ILookup<'Key, 'Source><Extension()>
Public Function ToLookup(Of TSource, TKey) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey), comparer As IEqualityComparer(Of TKey)) As ILookup(Of TKey, TSource)Type Parameters
- TSource
The type of elements of source.
- TKey
The type of the key returned by keySelector.
Parameters
- source
- ParallelQuery<TSource>
The sequence to create a ILookup<TKey,TElement> from.
- keySelector
- Func<TSource,TKey>
A function to extract a key from each element.
- comparer
- IEqualityComparer<TKey>
An IEqualityComparer<T> to compare keys.
Returns
A ILookup<TKey,TElement> that contains keys and values.
Exceptions
The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).
source or keySelector or is a null reference (Nothing in Visual Basic).
One or more exceptions occurred during the evaluation of the query.
See also
Applies to
ToLookup<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>)
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
- Source:
- ParallelEnumerable.cs
Creates an ILookup<TKey,TElement> from a ParallelQuery<TSource> according to a specified key selector function.
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static System::Linq::ILookup<TKey, TSource> ^ ToLookup(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector);public static System.Linq.ILookup<TKey,TSource> ToLookup<TSource,TKey>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector);static member ToLookup : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> -> System.Linq.ILookup<'Key, 'Source><Extension()>
Public Function ToLookup(Of TSource, TKey) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey)) As ILookup(Of TKey, TSource)Type Parameters
- TSource
The type of elements of source.
- TKey
The type of the key returned by keySelector.
Parameters
- source
- ParallelQuery<TSource>
The sequence to create a ILookup<TKey,TElement> from.
- keySelector
- Func<TSource,TKey>
A function to extract a key from each element.
Returns
A ILookup<TKey,TElement> that contains keys and values.
Exceptions
The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).
source or keySelector is a null reference (Nothing in Visual Basic).
One or more exceptions occurred during the evaluation of the query.
See also
Applies to
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