派生类

• Only immediate derived class members are returned
  ，则仅返回直接派生类成员。
• The concrete derived class is not visible to the user
  具体的派生类是不可见的用户
• In a derived class , be sure to call the base class s
  给继承者的说明重写派生类中的
• You must override this method in a derived class
  必须在派生类中重写此方法。
• This property can be overridden in a derived class
  此属性可在派生类中重写。
• The following example creates an instance of a derived class ,
  下面的示例创建派生类
• Respectively , but the corresponding derived classes are named
  ，但对应的派生类名为
• Class that is used to serialize a type
  的一个派生类，用于对类型进行序列化。
• When overridden in a derived class , creates the
  当在派生类中重写时，创建指定数据的
• If the method in the derived class is preceded with the
  如果派生类中的方法前面带有