C#中，下列操作符可以重载：
+ - ! ~ ++ 00 true false
* / % & | ^ << >> == != > < >= <=
下列操作符是不允许进行重载的：
= && || ?: new typeof sizeof is

// 操作符重载演示
using System;
class Player
{
    public int neili;
    public int tili;
    public int jingyan;
    public int neili_r;
    public int tili_r;
    public Player()
    {
        neili = 10;
        tili = 50;
        jingyan = 0;
        neili_r = 50;
        tili_r = 50;
    }
   
    // 一元操作符重载
    public static Player operator ++(Player p)
    {
        p.neili = p.neili + 50;
        p.tili = p.tili + 50;
        p.neili_r = p.neili;
        p.tili_r = p.tili;
        return p;
    }
   
    // 二元操作符重载
    public static Player operator +(Player p1, Player p2)
    {
        Player p = new Player();
        p.neili = p1.neili +p2.neili;
        p.tili = p1.tili + p2.tili;
        p.neili_r = p.neili;
        p.tili_r = p.tili;
       
        return p;
    }
   
    public static void Main()
    {
        Player p1 = new Player();
        Player p2 = new Player();
        p1++;
        Console.WriteLine(" {0}", p1.neili);
       
        Player p = p1 + p2;
        Console.WriteLine(" {0}", p.neili);
    }
}