找出字符串中字符出现次数最的字符

            int count = testStr.Length;
            int max = 0;
            char cCurrent = ' ';
            List<char> list = new List<char>();

            for (int i = 0; i < count ;i++)
            {
                char c = testStr[i];
                if (cCurrent != c && !list.Contains(c))
                {
                    list.Add(c); //保存己经出现的字符
                    int scount = 0;
                    for (int j = 0; j < count; j++)//统计
                    {
                        if (testStr[j] == c)
                            scount++;
                    }
                    if (scount > max)
                    {
                        max = scount;
                        cCurrent = c;
                    }
                }
            }
            Consolse.Write("最长字符串:"+ cCurrent.ToString() + ";长度为" + max.ToString());