C# 拓展方法

 1  /// <summary>
 2     /// 扩展类
 3     /// </summary>
 4     public static class Extend
 5     {
 6         /// <summary>
 7         /// 扩展Join方法
 8         /// 把数组分割
 9         /// 截取最后一位
10         /// </summary>
11         /// <param name="s"></param>
12         /// <param name="separotor">间隔符号</param>
13         /// <param name="value">数组</param>
14         /// <returns></returns>
15         public static string E_Join(this string [] value,string separotor)
16         {
17             string str = string.Join(separotor, value);
18             if (str.Length >= 2)
19             {
20                 return str.Substring(0, str.Length - 1);
21             }
22             else
23             {
24                 return str;
25             }
26         }
27     }