C# (CSharp) System.Collections.Generic IEnumerable.CountBy示例

示例#1

文件： EnumerableExtensions.cs 项目： sm-g/SimpleCards

 public static bool AllUnique <T, TKey>(this IEnumerable <T> source, Func <T, TKey> selector, IEqualityComparer <TKey>?comparer = null)
 {
     return(source.CountBy(selector, comparer).All(x => x.Value == 1));
 }