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Showing content from https://morelinq.github.io/3.0/ref/api/html/M_MoreLinq_MoreEnumerable_CountBy__2.htm below:

MoreEnumerableCountByTSource, TKey Method (IEnumerableTSource, FuncTSource, TKey)

Applies a key-generating function to each element of a sequence and returns a sequence of unique keys and their number of occurrences in the original sequence.

MoreLinq (in MoreLinq.dll) Version: 3.0.0

public static IEnumerable<KeyValuePair<TKey, int>> CountBy<TSource, TKey>(
	this IEnumerable<TSource> source,
	Func<TSource, TKey> keySelector
)

<ExtensionAttribute>
Public Shared Function CountBy(Of TSource, TKey) ( 
	source As IEnumerable(Of TSource),
	keySelector As Func(Of TSource, TKey)
) As IEnumerable(Of KeyValuePair(Of TKey, Integer))

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey>
static IEnumerable<KeyValuePair<TKey, int>>^ CountBy(
	IEnumerable<TSource>^ source, 
	Func<TSource, TKey>^ keySelector
)

[<ExtensionAttribute>]
static member CountBy : 
        source : IEnumerable<'TSource> * 
        keySelector : Func<'TSource, 'TKey> -> IEnumerable<KeyValuePair<'TKey, int>> 

source

Type: System.Collections.GenericIEnumerableTSource
Source sequence.

keySelector

Type: SystemFuncTSource, TKey
Function that transforms each item of source sequence into a key to be compared against the others.

TSource

Type of the elements of the source sequence.

TKey

Type of the projected element.

Type:

,

A sequence of unique keys and their number of occurrences in the original sequence.

In Visual Basic and C#, you can call this method as an instance method on any object of type

. When you use instance method syntax to call this method, omit the first parameter. For more information, see

or

.

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