// Cannot change source code
class Base
{
public virtual void Say()
{
Console.WriteLine("Called from Base.");
}
}
// Cannot change source code
class Derived : Base
{
public override void Say()
{
Console.WriteLine("Called from Derived.");
base.Say();
}
}
class SpecialDerived : Derived
{
public override void Say()
{
Console.WriteLine("Called from Special Derived.");
base.Say();
}
}
class Program
{
static void Main(string[] args)
{
SpecialDerived sd = new SpecialDerived();
sd.Say();
}
}
结果为:
从Special Derived中调用。
从Derived中调用。 /*这不是预期的*/
从Base中调用。
如何重写SpecialDerived类,以便不调用"Derived"类的方法?
更新:
我想继承Derived而不是Base的原因是Derived类包含许多其他实现。由于我不能在此处执行base.base.method()
,所以我想最好的方法是执行以下操作?
// 无法更改源代码
class Derived : Base
{
public override void Say()
{
CustomSay();
base.Say();
}
protected virtual void CustomSay()
{
Console.WriteLine("Called from Derived.");
}
}
class SpecialDerived : Derived
{
/*
public override void Say()
{
Console.WriteLine("Called from Special Derived.");
base.Say();
}
*/
protected override void CustomSay()
{
Console.WriteLine("Called from Special Derived.");
}
}