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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.linq.parallelenumerable.groupby below:

ParallelEnumerable.GroupBy Method (System.Linq) | Microsoft Learn

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function.

public:
generic <typename TSource, typename TKey, typename TElement, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::ParallelQuery<TResult> ^ GroupBy(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector, Func<TSource, TElement> ^ elementSelector, Func<TKey, System::Collections::Generic::IEnumerable<TElement> ^, TResult> ^ resultSelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);

public static System.Linq.ParallelQuery<TResult> GroupBy<TSource,TKey,TElement,TResult>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, Func<TKey,System.Collections.Generic.IEnumerable<TElement>,TResult> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);

public static System.Linq.ParallelQuery<TResult> GroupBy<TSource,TKey,TElement,TResult>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, Func<TKey,System.Collections.Generic.IEnumerable<TElement>,TResult> resultSelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer);

static member GroupBy : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> * Func<'Key, seq<'Element>, 'Result> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Linq.ParallelQuery<'Result>

<Extension()>
Public Function GroupBy(Of TSource, TKey, TElement, TResult) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement), resultSelector As Func(Of TKey, IEnumerable(Of TElement), TResult), comparer As IEqualityComparer(Of TKey)) As ParallelQuery(Of TResult)

Type Parameters

TSource

The type of the elements of source.

TKey

The type of the key returned by keySelector.

TElement

The type of the elements in each IGrouping{TKey, TElement}.

TResult

The type of the result value returned by resultSelector.

Parameters

keySelector: Func<TSource,TKey>

A function to extract the key for each element.

elementSelector: Func<TSource,TElement>

A function to map each source element to an element in an IGrouping{Key, TElement}.

resultSelector: Func<TKey,IEnumerable<TElement>,TResult>

A function to create a result value from each group.

Returns

A sequence of elements of type TResult where each element represents a projection over a group and its key.

Exceptions

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

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