C++/CLI:如何重写Object类的Equal方法

Question

我是C++/CLI的新手,并且在尝试覆盖基础Object类的Equal方法时遇到了一些问题.我得到以下代码的以下编译警告错误.该如何纠正？

Warning 1   warning C4490: 'override' : incorrect use of override specifier; 'Test::Sample::Equal' does not match a base ref class method   c:\project\code\Sample.h    18  

Error   2   error LNK2022: metadata operation failed (80131187) : Inconsistent method declarations in duplicated types (types: Test.Sample; methods: Equal): (0x06000002).  Sample.obj

编辑3:我将"Equal"更改为"Equals",删除了源文件中的override关键字,但错误2仍然存在.

//头文件

public ref class Sample : public Object
{
    public:
        int someVariable;

    virtual bool Equals(Object^ obj) override;
    virtual int GetHashCode() override;
}

// 源文件

bool Sample::Equals(Object^ obj)
{ 
    if ( obj == nullptr || GetType() != obj->GetType() )
        return false;

    Sample^ p = dynamic_cast<Sample^>(obj);
    return (someVariable == p->someVariable);
}

int Sample::GetHashCode()
{
    return GetHashCode();
}

Answer 1

方法的名称不是Equal,它是Equals.您不应该在实现中使用virtual或override关键字:

ref class Test {
public:
    virtual bool Equals(Object^ o) override; 
    virtual int GetHashCode() override;

};
bool Test::Equals(Object^ o) { // no "override" here 
    //...
}
int Test::GetHashCode() { // no "override" here
    //...
}