比较运算符的重载
using System; namespace 比较运算符的重载 { class Program { static void Main(string[] args) { //Console.WriteLine("Hello World!"); Vector vec1,vec2,vec3; vec1 = new Vector(3.0,3.0,-10.0); vec2 = new Vector(3.0,3.0,-10.0); vec3 = new Vector(2.0,3.0,6.0); System.Console.WriteLine($"vec1 == vec2 returns {vec1 == vec2}"); System.Console.WriteLine($"vec1 == vec3 returns {vec1 == vec3}"); System.Console.WriteLine($"vec2 == vec3 returns {vec2 == vec3}"); System.Console.WriteLine(); System.Console.WriteLine($"vec1 != vec2 returns {vec1 != vec2}"); System.Console.WriteLine($"vec1 != vec3 returns {vec1 != vec3}"); System.Console.WriteLine($"vec2 != vec3 returns {vec2 != vec3}"); //生成如下结果 // vec1 == vec2 returns True // vec1 == vec3 returns False // vec2 == vec3 returns False // vec1 != vec2 returns False // vec1 != vec3 returns True // vec2 != vec3 returns True } } struct Vector{ public double X{get;} public double Y{get;} public double Z{get;} public Vector(double x,double y,double z){ X = x; Y = y; Z = z; } public Vector(Vector vector){ X = vector.X; Y = vector.Y; Z = vector.Z; } public override string ToString()=>$"({X},{Y},{Z})"; public static bool operator == (Vector left,Vector right) { if(object.ReferenceEquals(left,right)) return true; return left.X == right.X &&left.Y == right.Y && left.Z == right.Z; } //还需要重载!= public static bool operator != (Vector left,Vector right)=>!(left == right); //现在重写Equals和GetHashCode方法。这些方法应该总是在重写==运算符时进行重写,否则编译器会报错。 public override bool Equals(object obj) { if(obj == null) return false; return this == (Vector)obj; } public override int GetHashCode()=>X.GetHashCode() ^ Y.GetHashCode() ^ Z.GetHashCode(); //有了以上所有代码,就可以实现该方法。 public bool Equals(Vector vector)=>this == vector; } }