运算符重载 ==, !=, Equals [英] Operator overloading ==, !=, Equals

问题描述

我已经看过问题

我明白，有必要实现==、!=和Equals().

I understand that, it is necessary to implement ==, != and Equals().

public class BOX
{
    double height, length, breadth;

    // this is first one '=='
    public static bool operator== (BOX obj1, BOX obj2)
    {
        return (obj1.length == obj2.length 
                    && obj1.breadth == obj2.breadth 
                    && obj1.height == obj2.height);
    }

    // this is second one '!='
    public static bool operator!= (BOX obj1, BOX obj2)
    {
        return !(obj1.length == obj2.length 
                    && obj1.breadth == obj2.breadth 
                    && obj1.height == obj2.height);
    }

    // this is third one 'Equals'
    public override bool Equals(BOX obj)
    {
        return (length == obj.length 
                    && breadth == obj.breadth 
                    && height == obj.height);
    }
}

我假设，我已经正确编写了代码来覆盖 ==,!=,Equals 运算符.但是，我得到如下编译错误.

I assume, I've written code properly to override ==,!=,Equals operators. Though, I get compilation errors as follows.

'myNameSpace.BOX.Equals(myNameSpace.BOX)' is marked as an override 
but no suitable method found to override.

所以，问题是 - 如何覆盖上述运算符 &摆脱这个错误?

So, question is - How to override above operators & get rid of this error?

推荐答案

我认为您像这样声明了 Equals 方法:

I think you declared the Equals method like this:

public override bool Equals(BOX obj)

因为 object.Equals 方法接受一个对象，所以没有方法可以用这个签名覆盖.你必须像这样覆盖它:

Since the object.Equals method takes an object, there is no method to override with this signature. You have to override it like this:

public override bool Equals(object obj)

如果你想要类型安全的Equals，你可以实现IEquatable.

If you want type-safe Equals, you can implement IEquatable<BOX>.

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