pure C# 技術社群

    public void CountString(string str)
        {
            StringBuilder sb = new StringBuilder();
            List<string> tmp = new List<string>();
            for (int i = 0; i < str.Length; i++)
            {
                string s = str.Substring(i, 1);

                int count = str.Split(s.ToCharArray()).Length - 1;

                if (!tmp.Contains(s))
                {
                    tmp.Add(s);
                    sb.Append(s + "," + count.ToString() + "次" + "\r\n");
                }
            }
            MessageBox.Show(sb.ToString());
        }