如何覆盖==运算符

Question

如何==为我的类的实例定义运算符？我试过这样的:

public bool operator == (Vector anotherVector)
{
    return this.CompareTo(anotherVector) == 1 ;              
}

但它说:

可以超载的一元运算符

Answer 1

您需要将方法标记为static,并且您必须实现不相等!=.

public static bool operator ==(Vector currentVector,Vector anotherVector)
{
    return currentVector.CompareTo(anotherVector) == 1 ;              
}

您必须实现==两个对象.

并为 !=

和

public static bool operator !=(Vector currentVector,Vector anotherVector)
{
    return !(currentVector.CompareTo(anotherVector) == 1) ;
}

请参阅:重载等于()和运算符的指南==(C#编程指南)

重载的operator ==实现不应该抛出异常.任何重载operator ==的类型也应该重载operator!=.