c# 继承

class person   //默认不写继承基类object，只能继承一个类。类的单根性。
{
public string Name
{
get;
set;
}
public int Age
{
get;
set;

}
public int Hight
{
get;
set;
}
public void Eat()
{
Console.WriteLine("eat");

}

public void Sleep()
{
Console.WriteLine("sleep");
}

}

class student:person
{

public void sayhi()
{

}
}

class teacher:person
{

public double Gonghao
{
get;
set;
}

}

 

 

class person2 //子类默认情况下，在自己调用前都会会调用无参数的构造函数，如没有则提示报错 解决办法一在父类参加一个无参的构造函数 解决办法二 base 调用父类的构造函数 不能被继承
{
public person2()//无参数构造函数
{

}
public person2(string name,int age,int height)
{
this.Name=name;
this.Age=age;
this.Hight=height;
}
public string Name
{
get;
set;
}
public int Age
{
get;
set;

}
public int Hight
{
get;
set;
}
public void Eat()
{
Console.WriteLine("eat");

}

public void Sleep()
{
Console.WriteLine("sleep");
}

}
class student2 : person2
{
public student2(string name,int age,int height,string sid ):base(name,age,height)
{

this.sid = sid;
//this.Name = name;
//this.Hight = height;
//this.Age = age;
}

public string sid
{
get;
set;
}
}

class teacher2 :person2
{

public teacher2(string name,int age,int height,string empid)
{
this.Name = name;
this.Age = age;
this.Hight = height;
this.empid = empid;
}

public string empid
{
get;
set;
}

}

//使用this调用自己的构造函数

class person3
{

public person3(string name,int age):this(name,1,"00",0)
{
this.Name=name;
this.Age=age;

}
public person3(string name,int age,string email, int height)

{
this.Age = age;
this.Email = email;
this.Name = name;
this.Hight = height;
}
public string Name
{
get;
set;
}
public int Age
{
get;
set;

}
public int Hight
{
get;
set;
}

public string Email
{
get;
set;
}
}