C#运算符重载

 1 class LimitedInt
 2     {
 3         const int MaxValue = 100;
 4         const int MinValue = 0;
 5 
 6         public static LimitedInt operator -(LimitedInt x)
 7         {
 8             LimitedInt li = new LimitedInt();
 9             li.TheValue = -x.TheValue;
10             return li;
11         }
12         public static LimitedInt operator -(LimitedInt x,double y)
13         {
14             LimitedInt li = new LimitedInt();
15             li.TheValue = x.TheValue - (int)y;
16             return li;
17         }
18 
19         private int _TheValue = 0;
20         public int TheValue
21         {
22             get 
23             {
24                 return _TheValue;
25             }
26             set
27             {
28                 _TheValue = value;
29             }
30         }
31 }

 1 class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             LimitedInt x = new LimitedInt();
 6             x.TheValue = 13;
 7 
 8             double y = 7;
 9 
10             LimitedInt li = new LimitedInt();
11 
12             li =x-y;
13 
14             Console.WriteLine("{0}",li.TheValue);
15 
16             li = -x;
17 
18             Console.WriteLine("{0}",li.TheValue);
19 
20             Console.ReadKey();
21         }
22     }