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CountByExtensionCountByTSource, TKey Method (IEnumerableTSource, FuncTSource, TKey, IEqualityComparerTKey)

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. An additional argument specifies a comparer to use for testing equivalence of keys.

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,
	IEqualityComparer<TKey> comparer
)

<ExtensionAttribute>
Public Shared Function CountBy(Of TSource, TKey) ( 
	source As IEnumerable(Of TSource),
	keySelector As Func(Of TSource, TKey),
	comparer As IEqualityComparer(Of 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, 
	IEqualityComparer<TKey>^ comparer
)

[<ExtensionAttribute>]
static member CountBy : 
        source : IEnumerable<'TSource> * 
        keySelector : Func<'TSource, 'TKey> * 
        comparer : IEqualityComparer<'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.

comparer

Type: System.Collections.GenericIEqualityComparerTKey
The equality comparer to use to determine whether or not keys are equal. If null, the default equality comparer for TSource is used.

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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