用C#中的键值对遍历数组或字符串元素的次数

代码如下:

 string strs = "ad6la4ss42d6s3";
            dictionary<char, int> dic = new dictionary<char, int>();
            foreach(var item in strs)
            {
                if (dic.keys.contains(item))
                {
                    dic[item]++;
                }
                else
                {
                    dic.add(item,1);
                }
            }
            foreach (var s in dic)
            {
                console.writeline("字符：{0}，出现次数为{1}",s.key,s.value);
            }