小编lam*_*mpi的帖子

让我们假设以下类结构具有基类BC和2个派生类DC_A和DC_B; 此外,还有一个XY类,带有一个带有BC类型参数和其他方法的methode goo()

// base class
public class BC
{
    public virtual void foo();
}

// derived class A
public class DC_A : BC
{
    public override void  foo() {}
}

// derived class B
public class DC_B : BC
{
    public override void  foo() {}
}


public class XY
{
    public void goo(BC o)
    {
        // perfectly fine using polymorphism; no Ifs' no casting, OOP at its best ;-)
        o.foo();

        // but what to do here?
        if ( (o …