{
static void Main(string[] args)
{
A a = new A();
B b =new B();
b.a = 300;
b.b = 20;
B e = a.Clone() as B;//这里会运行错误 但是变成b.clone() as B 就会正常
System.Console.WriteLine(e.a);
}
}
public class A : ICloneable
{
public A()
{
}
public int a=200;
#region ICloneable 成员
public virtual object Clone()
{
return MemberwiseClone();
}
#endregion
}
public class B:A
{
public int b = 10;
public B():base()
{
}
public override object Clone()
{
B c= base.Clone() as B;//为什么这里可以把基类变成派生类?????????
c.b = 100;
return c;
}
}
