C # implement Ruby's negative indexer _c# tutorial

C # implements Ruby's negative index

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;
        }}}
    
  

How to use:

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

      List[-2] = "ASD";
      List. ForEach (Console.WriteLine);

The code is very simple, easy to use, I hope to learn C # can help you