如何显示数组元素出现多少次 [英] How to display how many times an array element appears

问题描述

我是新的C＃，希望我能得到这个话题一定的帮助。我有一个元素的数组，我需要显示每一个项目出现多少次。

I am new to C# and hope I can get some help on this topic. I have an array with elements and I need to display how many times every item appears.

例如， [1，2，3，4，4,4，3] ， 1 出现一次， 4 出现了三次，依此类推。

For instance, in [1, 2, 3, 4, 4, 4, 3], 1 appears one time, 4 appears three times, and so on.

我做了以下但不`吨知道如何把它在foreach / if语句...

I have done the following but don`t know how to put it in the foreach/if statement...

int[] List = new int[]{1,2,3,4,5,4,4,3};
foreach(int d in List)
{
    if("here I want to check for the elements")
}

谢谢你，对不起，如果这是一个非常基本一...

Thanks you, and sorry if this is a very basic one...

推荐答案

您可以处理这种通过枚举。 GROUPBY 。我建议在看 C＃LINQ样品的计数和GROUPBY部分的指导。

You can handle this via Enumerable.GroupBy. I recommend looking at the C# LINQ samples section on Count and GroupBy for guidance.

在你的情况，这可能是：

In your case, this can be:

int[] values = new []{1,2,3,4,5,4,4,3};

var groups = values.GroupBy(v => v);
foreach(var group in groups)
    Console.WriteLine("Value {0} has {1} items", group.Key, group.Count());

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