/// <summary>     /// 扩展类     /// </summary>     public static class Extend     {         /// <summary>         /// 扩展Join方法         /// 把数组分割         /// 截取最后一位         /// </summary>         /// <param name="s"></param>         /// <param name="separotor">间隔符号</param>         /// <param name="value">数组</param>         /// <returns></returns>         public static string E_Join(this string [] value,string separotor)         {             string str = string.Join(separotor, value);             if (str.Length >= 2)             {                 return str.Substring(0, str.Length - 1);             }             else             {                 return str;             }         }     }