C#实现Ruby的负数索引器

C#实现Ruby的负数索引器

public class InvertibleList : List
  {
    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 list=new InvertibleList
      {
 "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