求教，关于派生类关系的问题！

[fishboyzyf]

class Program
{
public interface BaseInterface
{
void Test();
}
public class MyClass1 : BaseInterface
{
public void Test()
{
Console.WriteLine("in MyClass1;");
}
}
public class MyClass2 : MyClass1
{
public new void Test()
{
Console.WriteLine("in MyClass2;");
}
}


static void Main(string[] args)
{
BaseInterface x = new MyClass1();
x.Test();
x = new MyClass2();
x.Test();

}
}

结果为啥是：
in MyClass1;
in MyClass1;
而不是
in MyClass1;
in MyClass2;

[he_8134]

public class MyClass1 : BaseInterface

你可以用虚函数和override..

[zyug]

由于是new 重写的所以不在虚函数表中

Console.WriteLine(x is MyClass2);
Console.WriteLine(x is MyClass1);
Console.WriteLine(x is BaseInterface);
三个都是true


事实说明,还是要多用virtual和override.

[vwxyzh]

lz看看这个的运行结果吧

        static void Main()
        {
            D d = new D();
            A a = d;
            B b = d;
            C c = d;
            a.F();
            b.F();
            c.F();
            d.F();
        }
        class A
        {
            public virtual void F()
            {
                Console.WriteLine("A.F");
            }
        }
        class B : A
        {
            public override void F()
            {
                Console.WriteLine("B.F");
            }
        }
        class C : B
        {
            public new virtual void F()
            {
                Console.WriteLine("C.F");
            }
        }
        class D : C
        {
            public override void F()
            {
                Console.WriteLine("D.F");
            }
        }

[zoom3000s]

因为x的类型依然是BaseInterface