C#運算子多載

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運算子多載要求:

 

重載的執行個體為:

要定義重載的類中定義如下:

 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 TheValue21         {22             get 23             {24                 return _TheValue;25             }26             set27             {28                 _TheValue = value;29             }30         }31 }

可見,第一個重載的運算子是單目運算子,-號

第二個還是 -號,但是是雙目運算子。

此時可以做如下調用:

 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     }

輸出為6和-13,可見操作正確。

C#運算子多載

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