C#教程之C# 转换关键字 operator

operator#

使用 operator 关键字重载内置运算符，或在类或结构声明中提供用户定义的转换。

假设场景，一个Student类，有语文和数学两科成绩，Chinese Math，加减两科成绩，不重载运算，代码如下。

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class Student { /// <summary> /// 语文成绩 /// </summary> public double Chinese { get; set; } /// <summary> /// 数学成绩 /// </summary> public double Math { get; set; } }

比较两个成绩差距

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var a = new Student { Chinese = 90.5d, Math = 88.5d }; var b = new Student { Chinese = 70.5d, Math = 68.5d }; //a的语文比b的语文高多少分 Console.WriteLine(a.Chinese - b.Chinese); //a的数学比b的数学高多少分 Console.WriteLine(a.Math - b.Math);

使用operator 重载 -

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class Student { /// <summary> /// 语文成绩 /// </summary> public double Chinese { get; set; } /// <summary> /// 数学成绩 /// </summary> public double Math { get; set; } public static Student operator -(Student a, Student b) { return new Student { Chinese = a.Chinese - b.Chinese, Math = a.Math - b.Math }; } }

比较成绩差距的代码可以改为

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class Program { static void Main(string[] args) { var a = new Student { Chinese = 90.5d, Math = 88.5d }; var b = new Student { Chinese = 70.5d, Math = 68.5d }; var c = a - b; //a的语文比b的语文高多少分 Console.WriteLine(c.Chinese); //a的数学比b的数学高多少分 Console.WriteLine(c.Math); } }

参考：运算符（C# 参考）