C#字母排序

using System.Collections.Generic;
using System.Collections;
using System;

namespace my178
{

    public class MyComparer:Comparer<int>
    {
        public override int Compare(int x, int y)
        {
            return -(x-y);
        }
    }
   
    class Program
    {
       
        static void Main(string[] args)
        {
            SortedSet<int> list=new SortedSet<int>(new MyComparer());
            list.Add(15);
            list.Add(2);
            list.Add(25);
            list.Add(13);
            list.Add(7);
            list.Add(30);
            

            foreach(int x in list)
            {
                Console.WriteLine(x);
            }

            
    

        }

    }   

    
}