继承

 1、public class Chinese:Person
{
public string HuKou{get;set;}
public void KongFu(){....}
}
Chinese p1 = new Chinese();
p1.Name="李雷";
p1.HuKou="北京市朝阳区";
p1.SayHello();
p1.KongFu();

 

2、定义类的时候不指定父类，则是Object类。Object类是任何类的直接或者间接父类。（不严谨）

 

3、案例，覆盖Object类的ToString方法来自定义显示的字符串。

class Program { static void Main(string[] args) { Chinese c = new Chinese(); c.Name = "李小龙"; c.SayHello(); c.HuKou = "北京"; c.功夫(); Korean k = new Korean(); k.DoPaoCai(); Person p = c; p.SayHello(); Chinese c2 = (Chinese)p;//我要一个中国人，给了我一个Person变量，程序员负责 Person p2 = k; //c = (Chinese)p2; //报错 Console.ReadKey(); } } class Person { private int age; private string name; public int Age { set{this.age = value;} get{return this.age;} } public string Name { set{ this.name = value; } get{ return this.name; } } public void SayHello() { Console.WriteLine("{0}", this.Name); } } class Chinese:Person { private string hukou; public string HuKou { set{ this.hukou = value; } get{ return this.hukou; } } public void 功夫() { Console.WriteLine("我倒"); } } class Korean : Person { public void DoPaoCai() { Console.WriteLine("做泡菜"); } }