c# - 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:

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

但是它说:

overloadable unary operator expected

Answer 1

您需要将该方法标记为static，并且您还必须实现不等于!=。

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

你必须为两个对象实现==。

AND 为 !=

和

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

参见:Guidelines for Overloading Equals() and Operator == (C# Programming Guide)

Overloaded operator == implementations should not throw exceptions. Any type that overloads operator == should also overload operator !=.