public static void Main()
{
MyDerived mD = new MyDerived();
MyBase mB = (MyBase)mD;
System.Console.WriteLine(mB.Meth1());
System.Console.WriteLine(mB.Meth2());
System.Console.WriteLine(mB.Meth3());
}
public static void OverideDemo()
{
MyDerived mD = new MyDerived();
MyBase mB = (MyBase)mD;
//overide重写后转回 还是重写后的继承方法。
System.Console.WriteLine(mB.Meth1());
// 使用 new 关键字显式隐藏
System.Console.WriteLine(mB.Meth2());
// 该方法隐藏了继承的成员 MyBase.Meth3()：
System.Console.WriteLine(mB.Meth3());
}