public class Indexsy
  {
    private string[] array ;
    public Indexsy(int num)
    {
      array = new string[num];
      for (int i = 0; i < num; i++)
      {
        array[i] = "Array"+i;
      }
    }
 
    public string this[int num]
    {
      get { return array[num]; }
      set { array[num] = value; }
    }
  }
 
///索引器调用
      Indexsy sy = new Indexsy(10);
      Response.Write(sy[5]);//输出Array5

public class Indexsy
  {
    private string[] array ;
    public Indexsy(int num)
    {
      array = new string[num];
      for (int i = 0; i < num; i++)
      {
        array[i] = "Array"+i;
      }
    }
 
    public string this[int num, string con]
    {
      get {
        if (num == 6)
        {
          return con;
        }
        else
        {
          return array[num];
        }
      }
      set
      {
        if (num == 6)
        {
          array[num] = con;
        }
        else
        {
          array[num] = value;
        }
 
      }
    }
  }
 
//方法调用
      Indexsy sy = new Indexsy(10);
      sy[5,"10"] = "更换set值"; 
      Response.Write(sy[5,""]+" "+sy[6,"更换内部参数"]+" "+sy[8,""]);//输出为更换set值 更换内部参数 Array8,