C# 从父类调用子类方法
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Calling child class method from parent
提问by user1178494
Is it possible for the a.doStuff() method to print "B did stuff" without editing the A class? If so, how would I do that?
a.doStuff() 方法是否可以在不编辑 A 类的情况下打印“B did stuff”？如果是这样，我该怎么做？
class Program
{
static void Main(string[] args)
{
A a = new A();
B b = new B();
a.doStuff();
b.doStuff();
Console.ReadLine();
}
}
class A
{
public void doStuff()
{
Console.WriteLine("A did stuff");
}
}
class B : A
{
public void doStuff()
{
Console.WriteLine("B did stuff");
}
}
I'm modding a steam game, Terraria. And I don't want to decompile and recompile it all because that will screw with steam. My program 'injects' into Terraria via XNA. I can use the update() and draw() methods from XNA to mod some things. But it's pretty limited. I wan't to override base methods to mod more things (worldgen for example).
我正在修改 Steam 游戏，泰拉瑞亚。而且我不想反编译并重新编译它，因为这会影响蒸汽。我的程序通过 XNA“注入”到泰拉瑞亚。我可以使用 XNA 的 update() 和 draw() 方法来修改一些东西。但它非常有限。我不想覆盖基本方法来修改更多东西（例如 worldgen）。
回答by Aliostad
Yes, if you declare doStuffas virtualin Aand then overridein B.
是的，如果你声明doStuff为virtualinA然后overridein B。
class A
{
public virtual void doStuff()
{
Console.WriteLine("A did stuff");
}
}
class B : A
{
public override void doStuff()
{
Console.WriteLine("B did stuff");
}
}
回答by mdprotacio
Since B is effectively A through inheritance and the method is overloaded.
由于 B 通过继承实际上是 A 并且该方法被重载。
A a = new B();
a.doStuff();
回答by VS1
The code for class A & B you have posted will anyways generate below compiler warning and will ask to use the newkeyword on class B, although it will compile:
The keyword new is required on 'B.doStuff()' because it hides inherited member 'A.doStuff()'
您发布的 A 类和 B 类代码无论如何都会生成以下编译器警告，并会要求new在类 B 上使用关键字，尽管它会编译：
'B.doStuff()' 上需要关键字 new，因为它隐藏了继承的成员'A.doStuff()'
Use method hidingalong with newand virtualkeyword in class Mapper and class B as follows:
使用method hiding沿new和virtual类映射器和B类的关键字如下：
class Program
{
static void Main(string[] args)
{
Mapper a = new B(); //notice this line
B b = new B();
a.doStuff();
b.doStuff();
Console.ReadLine();
}
}
class A
{
public void doStuff()
{
Console.WriteLine("A did stuff");
}
}
class Mapper : A
{
new public virtual void doStuff() //notice the new and virtual keywords here which will all to hide or override the base class implementation
{
Console.WriteLine("Mapper did stuff");
}
}
class B : Mapper
{
public override void doStuff()
{
Console.WriteLine("B did stuff");
}
}
