Chinese Enterprise C # Object-oriented--inheriting practice

class // Create an Electrical class: parent class     {        privatestring  _dianqimingzi;          Public string Dianqimingzi        {            getreturn  _dianqimingzi;}             Set {_dianqimingzi = value;}        }    }

 class  computer:dianqi //  Create a computer class: Subclass   { private  string   _diannaomingzi;  public  string   Diannaomingzi { get  {return              _diannaomingzi;}         set  {_diannaomingzi =

class Lenovo:computer  // Create Lenovo Class: Subclass of Subclass     {        privatestring  _lname;          Public string Lname        {            getreturn  _lname;}             Set {_lname = value;}        }    }

namespaceInherit practice{classProgram {Static voidMain (string[] args) {   //Appliances: Parent classDianqi Dianqi1 =NewDianqi (); Dianqi1. Dianqimingzi="Electrical Appliances"; Console.WriteLine ("the name of the appliance is"+Dianqi1.            Dianqimingzi); //Computer: Sub-categoryComputer Diannao =Newcomputer (); Diannao. Diannaomingzi="Computer"; Console.WriteLine ("the name of the computer is"+Diannao.            Diannaomingzi); //computers that inherit electrical propertiesDiannao. Dianqimingzi ="A computer that inherits electrical properties (subclasses inherit the properties of the parent's electrical name)"; Console.WriteLine ("computer subclass inherit electrical Appliance the property after the parent class is"+Diannao.            Dianqimingzi); //Lenovo: Sub-class of subclassesLenovo le =NewLenovo (); Le. Lname="Lenovo Computer"; Console.WriteLine ("the name of Lenovo Computer is"+le.                        Lname); //Lenovo that inherits the properties of the computerLenovo Le1 =NewLenovo (); Le1. Diannaomingzi="Lenovo Computer"; Le1. Dianqimingzi="The computer under the appliance is Lenovo"; Console.WriteLine ("the name of the computer property is"+Le1.            Diannaomingzi); Console.WriteLine ("the name of the electrical property is"+Le1.            Dianqimingzi); //Subclass to Parent class: Subclasses inherit the parent class, a subclass can have only one parent class, and a parent class may have more than one child class. //subclasses have the functions and properties of the parent class, and the parent class does not have subclasses. //a subclass can be converted to a parent class, but the parent class does not have properties and methods for the child class. //For example, a pig can be called a creature, but a creature cannot be called a pig. Computer Com =NewComputer ();//sub-class computerDianqi DCom = Com;//sub-class computer converted to Parent applianceDcom.dianqimingzi ="the name of the sub-class computer converted to the parent appliance";            Console.WriteLine (Dcom.dianqimingzi); //the parent class can be converted to subclasses, but there are prerequisites. Premise: Before the parent class is a subclass, it can be converted to the corresponding subclass. Computer AAA =NewComputer ();//Create a subclass of AAADianqi DDD = AAA;//converts a subclass AAA to a parent class DDDComputer XXX = (computer) DDD;//Convert the parent class DDD to subclass XXXXxx. Dianqimingzi ="parent class converted to child class"; Console.WriteLine (XXX.            Dianqimingzi); //The following is a non- conforming situation where the code is error-free and runs incorrectly. //Dianqi ddd1 = new Dianqi (); //Computer xxx1 = (computer) ddd1; //xxx1.            Dianqimingzi = "Parent class is converted to subclass (not conforming to the condition)"; //Console.WriteLine (xxx1. Dianqimingzi);Console.ReadLine (); }    }}

Chinese Enterprise C # Object-oriented--inheriting practice