Calling a Method from "base.base" class?

本文关键字：base quot class Method from Calling | 更新日期: 2023-09-27 18:28:01

"假设以下代码：

public class MultiplasHerancas
{
    static GrandFather grandFather = new GrandFather();
    static Father father = new Father();
    static Child child = new Child();
    public static void Test() 
    {
        grandFather.WhoAreYou();
        father.WhoAreYou();
        child.WhoAreYou();
        GrandFather anotherGrandFather = (GrandFather)child;
        anotherGrandFather.WhoAreYou(); // Writes "I am a child"
    }
}
public class GrandFather
{
    public virtual void WhoAreYou() 
    {
        Console.WriteLine("I am a GrandFather");
    }
}
public class Father: GrandFather
{
    public override void WhoAreYou()
    {
        Console.WriteLine("I am a Father");
    }
}
public class Child : Father 
{
    public override void WhoAreYou()
    {
        Console.WriteLine("I am a Child");
    }
}

我想从"孩子"对象打印"我是爷爷"。

如何让Child对象在"base.base"类上执行方法？我知道我可以执行基本方法（它会打印"I Am a Father"），但我想打印"I Am a GrandFather"！如果有办法做到这一点，在OOP设计中推荐吗？

注意：我不使用/将使用这种方法，我只是想加强知识继承。

Calling a Method from "base.base" class?

这只能使用方法隐藏-实现

public class GrandFather
{
    public virtual void WhoAreYou()
    {
        Console.WriteLine("I am a GrandFather");
    }
}
public class Father : GrandFather
{
    public new void WhoAreYou()
    {
        Console.WriteLine("I am a Father");
    }
}
public class Child : Father
{
    public new void WhoAreYou()
    {
        Console.WriteLine("I am a Child");            
    }
}

这样称呼它-

Child child = new Child();
((GrandFather)child).WhoAreYou();

使用new关键字hides the inherited member of base class in derived class。

尝试使用"new"关键字而不是"override"，并从方法中删除"virtual"关键字；）

此程序在运行时出错。确保子对象将引用父类，然后使用引用类型强制转换调用方法例如：child-child=新爷爷（）/这里我们正在创建引用parentclass的child实例/（（爷爷）孩子）WhoAreYou（）；/*现在我们可以使用引用类型*/否则，它们在祖父类型铸造下显示错误。

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