C#实现Ruby的负数索引器

c#实现ruby的负数索引器

public class invertiblelist<t> : list<t>
  {
    public new t this[int index]
    {
      get
      {
        if (index >= 0) return base[index];
        if (count + index < 0)
          throw new indexoutofrangeexception();
        return this[count + index];
      }
      set
      {
        if (index >= 0)
          base[index] = value;
        else
        {
          if (count + index < 0) 
            throw new indexoutofrangeexception();
          this[count + index] = value;
        }
      }
    }
    
  }

使用方法：

invertiblelist<string> list=new invertiblelist<string>
      {
        "1",
        "2",
        "3",
        "4",
        "5",
      };

      list[-2] = "asd";
      list.foreach(console.writeline);

代码很简单，使用也很方便，希望对大家学习c#能够有所帮助