我们如何检查实现相等运算符的类型的引用相等？ [英] How can we check reference equality for a type that implements equality operator?

问题描述

在C＃中，我们如何检查实现相等运算符的类型的引用相等性？

In C#, how can we check reference equality for a type that implements equality operator?

class C
{
    public int Val{get;set;}
    public static bool operator ==(C c1, C c2)
    {
        return c1.Val == c2.Val;
    }
    public static bool operator !=(C c1, C c2)
    {
        return c1.Val != c2.Val;
    }
}
class Program
{
    public static void Main(string[] args)
    {
        C c1=new C(){Val=1};
        C c2=new C(){Val=1};
        Console.WriteLine(c1==c2);//True. but they are not same objects. 
                                  //How can I Check that?
        Console.Write("Press any key to continue . . . ");
    }
}

推荐答案

如果意思是指引用相等，即使 == 运算符已重载，也可以使用 Object.ReferenceEquals 静态方法当前类型可以正常工作：

If you mean equality by reference, you may use the Object.ReferenceEquals static method even if the == operator was overloaded for the current type to work otherwise:

Object.ReferenceEquals(obj1, obj2);

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