你必须知道的.NET之class和struct(2)

public class Person
{
public Person()
{ 
}
public Person(string name, int age)
{
_name = name;
_age = age;
}
private string _name;
public string Name
{
get { return _name; }
set { _name = value; }
}
private int _age;
public int Age
{
get { return _age; }
set { _age = value; }
} 
}

//可以继承自接口，不可继承类或结构
struct Family: IPerson
{
public string name;
public int age;
public bool sex;
public string country;
public Person person;
//不可以包含显式的无参构造函数和析构函数
public Family(string name, int age, bool sex, string country, Person person)
{
this.name = name;
this.age = age;
this.sex = sex;
this.country = country;
this.person = person;
}
//不可以实现protected、virtual、sealed和override成员
public void GetSex()
{
if (sex)
Console.WriteLine(person.Name + " is a boy.");
else
Console.WriteLine(person.Name + " is a girl.");
}
public void ShowPerson()
{
Console.WriteLine("This is {0} from {1}", 
new Person(name, 22).Name, country);
}
//可以重载ToString虚方法
public override string ToString()
{
return String.Format("{0} is {1}, {2} from {3}", 
person.Name, age, sex ? "Boy" : "Girl", country);
}
}