ParallelEnumerable.ToLookup Method

Reference

Definition

Namespace:: System.Linq

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

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

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

ILookup<TKey,TElement>

A Lookup<(Of <(TKey, TElement>)>) that contains values of type TElement selected from the input sequence.

Exceptions

OperationCanceledException

The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).

ArgumentNullException

source or keySelector or elementSelector is a null reference (Nothing in Visual Basic).

AggregateException

One or more exceptions occurred during the evaluation of the query.

Applies to

ToLookup<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)

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

ILookup<TKey,TElement>

A ILookup<TKey,TElement> that contains values of type TElement selected from the input sequence.

Exceptions

OperationCanceledException

The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).

ArgumentNullException

source or keySelector or elementSelector is a null reference (Nothing in Visual Basic).

AggregateException

One or more exceptions occurred during the evaluation of the query.

Applies to

ToLookup<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)

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

ILookup<TKey,TSource>

A ILookup<TKey,TElement> that contains keys and values.

Exceptions

OperationCanceledException

The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).

ArgumentNullException

source or keySelector or is a null reference (Nothing in Visual Basic).

AggregateException

One or more exceptions occurred during the evaluation of the query.

Applies to

ToLookup<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>)

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

ILookup<TKey,TSource>

A ILookup<TKey,TElement> that contains keys and values.

Exceptions

OperationCanceledException

The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).

ArgumentNullException

source or keySelector is a null reference (Nothing in Visual Basic).

AggregateException

One or more exceptions occurred during the evaluation of the query.

Applies to

แชร์ผ่าน

ParallelEnumerable.ToLookup Method

Definition

Overloads

ToLookup<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)

Type Parameters

Parameters

Returns

Exceptions

See also

Applies to

ToLookup<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)

Type Parameters

Parameters

Returns

Exceptions

See also

Applies to

ToLookup<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)

Type Parameters

Parameters

Returns

Exceptions

See also

Applies to

ToLookup<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>)

Type Parameters

Parameters

Returns

Exceptions

See also

Applies to

แหล่งทรัพยากรเพิ่มเติม