C#:有什么方法可以跳过多态中的一个基本调用？

Question

class GrandParent
{
    public virtual void Foo() { ... }
}

class Parent : GrandParent
{
    public override void Foo()
    {
       base.Foo();

       //Do additional work
    }
}

class Child : Parent
{
    public override void Foo()
    {
        //How to skip Parent.Foo and just get to the GrandParent.Foo base?

        //Do additional work
    }
}

---

如上面的代码所示,我如何让Child.Foo()调用GrandParent.Foo()而不是进入Parent.Foo()？base.Foo()首先带我到Parent类.

Answer 1

如果您需要,您的设计是错误的.
相反,将每类逻辑放入,DoFoo而不是在不需要时调用base.DoFoo.

class GrandParent
{
    public void Foo()
    {
        // base logic that should always run here:
        // ...

        this.DoFoo(); // call derived logic
    }

    protected virtual void DoFoo() { }
}

class Parent : GrandParent
{
    protected override void DoFoo()
    {    
       // Do additional work (no need to call base.DoFoo)
    }
}

class Child : Parent
{
    protected override void DoFoo()
    {  
        // Do additional work (no need to call base.DoFoo)
    }
}

Answer 2

我认为你的设计有问题.从本质上讲,您希望"打破"多态的规则.你说Child应该派生自Parent但希望方便地跳过它的父实现.

重新考虑你的设计.