C#操作符的重载

c#要求所有的运算符重载都声明为public 和static，这表示他们与他们的类或结构相关联，而不与实例相关联。操作符的重载使用operator关键字，C#不允许重载=操作符。

下面是一个重载+操作符的列子，

 

        static void Main(string[] args)
        {
            Square a = new Square(3, 3);
            Square b = new Square(5, 5);
            Square c = new Square();
            c = a + b;
            Console.WriteLine(c.ToString());
            Console.ReadKey();
        }

   public class Square
    {
       public Square() { }
       public Square(int w,int h)
       {
           this.w = w;
           this.h = h;
       }
       public Square(int area)
       {
           this.area=area;
       }
       public int w { get; set; }
       public int h { get; set; }
       public int area{get;set;}

       public static Square operator +(Square a,Square b)
       {
           return new Square(a.w*a.h+b.w*b.h);
       }
       public override string ToString()
       {
           return this.area.ToString();
       }
   }