如何在子类中删除从父类继承的方法?

Question

我有ChildClassA,ChildClassB和ChildClassC。

它们都继承自ParentClass。

如何为A和B声明已经实现的method，但在C中不需要?

1. ParentClass中的实现没有意义，因为我只需要它在A和B中。

2. c#不支持多重继承(如果这是我最好的选择)。

3. 接口不能帮助我，因为我不能在那里实现一个方法。

Answer 1

您要寻找的是一种组合形式:

using System;

public class Program
{
public static void Main()
{
var a = new ChildA();
a.SomeMethod();

var b = new ChildB();
b.SomeMethod();

var c = new ChildC();
// c.SomeMethod(); Doesn't have SomeMethod
}
}
public class ParentClass
{
}
public class ChildA : ParentClass, IHavingSomeMethod
{
private readonly IHavingSomeMethod _sms;

public ChildA()
{
_sms = new HavingSomeMethodService(); // Have it injected instead!
}

public void SomeMethod() => _sms.SomeMethod();
}
public class ChildB : ParentClass, IHavingSomeMethod
{
private readonly IHavingSomeMethod _sms;

public ChildB()
{
_sms = new HavingSomeMethodService(); // Have it injected instead!
}

public void SomeMethod() => _sms.SomeMethod();
}
public class ChildC : ParentClass
{
}
public interface IHavingSomeMethod
{
void SomeMethod();
}
public class HavingSomeMethodService: IHavingSomeMethod
{
public void SomeMethod()
{
Console.WriteLine("SomeMethod");
}
}

Try it out

Answer 2

ParentClass继承

• CommonClass

• 和ChildClassC

CommonClass继承

• ChildClassA
• 和ChildClassB

CommonClass定义了method