C#程序从整数列表中打印重复项
要从整数列表中打印重复项，请使用ContainsKey。
下面，我们首先设置整数。
int[] arr = {
3,
6,
3,
8,
9,
2,
2
};然后使用Dictionary集合获取重复整数的计数。
让我们看一下获取重复整数的代码。
示例
using System;
using System.Collections.Generic;
namespace Demo {
public class Program {
public static void Main(string[] args) {
int[] arr = {
3,
6,
3,
8,
9,
2,
2
};
var d = new Dictionary < int,int > ();
foreach(var res in arr) {
if (d.ContainsKey(res))
d[res]++;
else
d[res] = 1;
}
foreach(var val in d)
Console.WriteLine("{0} occurred {1} times", val.Key, val.Value);
}
}
}输出结果
3 occurred 2 times 6 occurred 1 times 8 occurred 1 times 9 occurred 1 times 2 occurred 2 times