c# - 我如何使用 linq 查找数据集中出现次数最多的数据？

Question

List<int> a = 11,2,3,11,3,22,9,2

//output
11

Answer 1

这可能不是最有效的方法，但它可以完成工作。

public static int MostFrequent(IEnumerable<int> enumerable)
{
    var query = from it in enumerable
                 group it by it into g
                 select new {Key = g.Key, Count = g.Count()} ;
   return query.OrderByDescending(x => x.Count).First().Key;
} 

还有有趣的单行版本......

public static int MostFrequent(IEnumerable<int> enumerable)
{
    return (from it in enumerable
                 group it by it into g
                 select new {Key = g.Key, Count = g.Count()}).OrderByDescending(x => x.Count).First().Key;

}