#region 删除重复字符        string s = "sdfffffsrlkjesgljfdg03940864e5=_0R9DTGR98YUI\\|||'\\???fdf///";        Response.Write("
String：" + s + "
Result：");        IEnumerable
    
      distinctList = s.Distinct();        foreach (char a in distinctList)        {            Response.Write(a.ToString());        }        //使用移除法        for (int i = 0; i < s.Length; i++)        {            while (s.IndexOf(s.Substring(i, 1)) != s.LastIndexOf(s.Substring(i, 1)))            {                s = s.Remove(s.LastIndexOf(s.Substring(i, 1)), 1);            }        }        Response.Write("
     
Result：" + s);        #endregion