如何在c＃列表中获取最多的项目？

Question

I know in c#, to get a item from a list can use FirstOrDefault() or other functions. I am looking for a function can get most presented items from a List.

For example:

{ "a" , "a" , "a" , "b" }.MostPresents() => "a"

Is there a default function in c# (asp.net 4.0) for this?

Answer 1

Is there a default function in c# (asp.net 4.0) for this?

No, but you can slap together some LINQ and get it pretty quickly.

var mostFrequent = sequence.GroupBy(x => x)
                           .Select(g => new { g.Key, Count = g.Count() })
                           .MaxBy(x => x.Count)
                           .Key;

Here, I am using MaxBy .

Answer 2

var MostCommonItem = list.GroupBy(item => item)
                         .OrderByDescending(g => g.Count())
                         .Select(g => g.Key).First();