C#实现相等性判断的方法:
//确定指定的 System.Object 是否等于当前的 System.Objectpublic virtual bool Equals(object obj){ return RuntimeHelpers.Equals(this, obj);}//确定是否将指定的 System.Object 实例视为相等public static bool Equals(object objA, object objB){ return ((objA == objB) || (((objA != null) && (objB != null)) && objA.Equals(objB)));}//确定指定的 System.Object 实例是否是相同的实例public static bool ReferenceEquals(object objA, object objB){ return (objA == objB);}==和 !=运算符比较内容
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using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Text;namespace ValueTypeDemo{ //鞋子类 class Shoes { PRivate string name; //品名 private int price; //单价 public string Name { get { return name; } set { name = value; } } public int Price { get { return price; } set { price = value; } } } class Program { static void Main(string[] args) { Shoes S1 = new Shoes(); Shoes S2 = new Shoes(); Shoes S3 = S2; int x = 5; int y = 8; int z = x; object A = 11; object B = A; object C = 11; //内容比较 Console.WriteLine(x==y); //false Console.WriteLine(x==z); //true //装箱后按引用比较 Console.WriteLine(A==B); //true Console.WriteLine(A==C); //false //装箱后按装箱前类型比较值是否相等 Console.WriteLine(A.Equals(B)); //true Console.WriteLine(A.Equals(C)); //true Console.WriteLine(Equals(A, B)); //true Console.WriteLine(Equals(A, C)); //true //强制按引用比较 Console.WriteLine(ReferenceEquals(A,B)); //true Console.WriteLine(ReferenceEquals(A,C)); //false Console.ReadKey(); } }}
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