C#中ReferenceEquals和Equals的区别

时间:2024-01-08 22:37:32

ReferenceEquals()判断两个字符串是否指向相同的内存地址;(判断引用)

Equals,先判断两个字符串有相同的内存位置,是则两个字符串相等;否则逐字符比较两个字符串,判断是否相等(先判断引用,在判断值是否相等)

下面举一个例子看一下:

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string peom1 = "Kubla Khan";  
           string peom2 = "Kubla Khan";  
           string peom3 = String.Copy(peom2);  
           string peom4 = "kubla khan";  
 
           //ReferenceEquals()判断两个字符串是否指向相同的内存地址  
           Console.WriteLine("peom1 == peom2:"+(peom1 == peom2));//True  
           Console.WriteLine("peom1 == peom3:" + (peom1 == peom3));//True  
           Console.WriteLine("ReferenceEquals(peom1,peom3):" + ReferenceEquals(peom1, peom3));//False  
             
           //Equals,先判断两个字符串有相同的内存位置,则两个字符串相等;否则逐字符比较两个字符串,判断是否相等  
           Console.WriteLine("Equal(peom1,peom3):" +String.Equals(peom1, peom2));//true  
           Console.WriteLine("Equal(peom1,peom3):" + String.Equals(peom1, peom3));//true

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