部署OAuth2.0授权系统时是否需要身份验证？(Is authentication necessary when deploying an OAuth2.0 authorization system?)

 new 隐藏了旧方法，这意味着如果您直接在ConvertibleCar实例上调用它，您将获得派生类的行为，但不会以多态方式调用。 
 
 当基类调用它时，它调用虚方法，因为它没有被覆盖，所以调用基类方法。 而不是使用方法隐藏（你几乎从不使用方法），只需重写它： 
 
class ConvertibleCar : Car
{
    public override void ShowDetails()
    {
        System.Console.WriteLine("A roof that opens up.");
    }
}

new hides the old method, which means that if you directly call it on a ConvertibleCar instance, you will get the derived class behavior, but it won't be called polymorphically.
 
When the base class calls it, it is calling the virtual method, which since it hasn't been overridden invokes the base class method. Instead of using method hiding (which you almost never use anyways), just override it:
 
class ConvertibleCar : Car
{
    public override void ShowDetails()
    {
        System.Console.WriteLine("A roof that opens up.");
    }
}