using System;
namespace Application
{
abstract class BaseClass
{
    public virtual void MethodA()
    {
    }
    public virtual void MethodB()
    {
    }
}
class Class1: BaseClass
{
    public void MethodA(string arg)
    {
    }
    public override void MethodB()
    {
    }
}
class Class2: Class1
{
    new public void MethodB()
    {
    }
}
class MainClass
{
    public static void Main(string[] args)
    {
        Class2 o = new Class2();
        o.MethodA();
    }
}
}

• BaseClass.MethodA

• Class2.MethodA

• Class1.MethodA

• 都不是