Enumerable.CountBy<TSource,TKey> メソッド

  • リファレンス

定義

名前空間:
System.Linq
アセンブリ:
System.Linq.dll
ソース:
CountBy.cs
public static System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,int>> CountBy<TSource,TKey> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? keyComparer = default);
static member CountBy : seq<'Source> * Func<'Source, 'Key> * System.Collections.Generic.IEqualityComparer<'Key> -> seq<System.Collections.Generic.KeyValuePair<'Key, int>>
<Extension()>
Public Function CountBy(Of TSource, TKey) (source As IEnumerable(Of TSource), keySelector As Func(Of TSource, TKey), Optional keyComparer As IEqualityComparer(Of TKey) = Nothing) As IEnumerable(Of KeyValuePair(Of TKey, Integer))

型パラメーター

TSource
TKey

パラメーター

source
IEnumerable<TSource>
keySelector
Func<TSource,TKey>
keyComparer
IEqualityComparer<TKey>

戻り値

IEnumerable<KeyValuePair<TKey,Int32>>

適用対象