C#实现String字符串转化为SQL语句中的In后接的参数详解

public string StringToList(string aa)
  {
    string bb1 = "(";
    if (!string.IsNullOrEmpty(aa.Trim()))
    {
      
      string[] bb = aa.Split(new string[] { "\r\n", ",", ";", "* " }, StringSplitOptions.RemoveEmptyEntries);
      for (int i = 0; i < bb.Length; i++)
      {
        if (!bb1.Contains(bb[i]))//去掉重复的輸入值
        {
          bb1 += "'" + bb[i] + "',";
        }
      }
    }
    bb1 = bb1.Substring(0, bb1.LastIndexOf(",")) + ")";
    return bb1;
  }