C#實現Ruby的負數索引器

標籤：

    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);

 

C#實現Ruby的負數索引器