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C# 中支持运算符重载，所谓运算符重载就是我们可以使用自定义类型来重新定义 C# 中大多数运算符的功能。运算符重载需要通过 operator 关键字后跟运算符的形式来定义的，我们可以将被重新定义的运算符看作是具有特殊名称的函数，与其他函数一样，该函数也有返回值类型和参数列表，如下例所示：

public static Box operator+ (Box b, Box c) {Box box = new Box();box.length = b.length + c.length;box.breadth = b.breadth + c.breadth;box.height = b.height + c.height;return box;
}

重点
运算符重载格式

public static ClassName operator##op (ele) {//something
}

下表描述了 C# 中运算符重载的能力：

运算符 描述

细看

using System;//主程序入口
class TODO {static void Main() {Console.WriteLine("Hello C#!");ComplexNumber a = new ComplexNumber(1, 2);ComplexNumber b = new ComplexNumber(2, 5);ComplexNumber c = new ComplexNumber();c = a + b;Console.WriteLine("c = {0} + {1}i",c.real, c.imaginary);double rea, imb;c.linkA(out rea).linkB(out imb);Console.WriteLine("rea = {0}, imb = {1}", rea, imb);}
}class ComplexNumber{//私有成员 实部和虚部private double Real;private double Imaginary;//get setpublic double real {get { return Real; } set { Real = value;  }    }public double imaginary {get { return Imaginary; }set { Imaginary = value; }}//含参构造public ComplexNumber(double re = 0.0, double im = 0.0) {real = re;imaginary = im;}~ComplexNumber() { }//运算符重载public static ComplexNumber operator+ (ComplexNumber a, ComplexNumber b) {ComplexNumber c = new ComplexNumber(0, 0);c.real = a.real + b.real;c.imaginary = a.imaginary + b.imaginary;return c;}//链式调用public ComplexNumber linkA(out double re) {re = real;return this;}public ComplexNumber linkB(out double im) {im = imaginary;return this;}}