Question

修改下面代码 C#实现对基类的属性重载

在Undergraduat和Graduate中分别重载Grade属性，强制要求Undergraduate的年级范围在1—4之间，而Graduate的年级范围在1—3之间
using System;
using System.Collections.Generic;
using System.Text;

namespace L7_3
{
class Student
{
private int _id;
public int ID
{
get
{
return _ID;
}
set
{
_ID = value;
}
}
private string _name;
public string Name
{
get
{
return _name;
}
set
{
_name = value;
}
}
private string _gender;
public string Gender
{
get
{
return _gender;
}
set
{
_gender = value;
}
}
private int _class;
public int Class
{
get
{
return _class;
}
set
{
_class = value;
}
}
private int _grade;
public virtual int Grade
{
get
{
return _grade;
}
set
{
_name = value;
}
}

}
class Undergraduate : Student
{
private string _department;
public string Department
{
get
{
return _department;
}
set
{
_department = value;
}
}
}
class Graduate : Student
{
private string O_tutor;
public string Tutor
{
get
{
return O_tutor;
}
set
{
O_tutor = value;
}
}
}
}

Answer 1

你好，根据你的需求，重写了Grade属性：

// copyright @ quark
// date: 2010-11-16

using System;
using System.Collections.Generic;
using System.Text;

namespace L7_3
{
class Student
{
private int _id;
public int ID
{
get
{
return _id;
}
set
{
_id = value;
}
}
private string _name;
public string Name
{
get
{
return _name;
}
set
{
_name = value;
}
}
private string _gender;
public string Gender
{
get
{
return _gender;
}
set
{
_gender = value;
}
}
private int _class;
public int Class
{
get
{
return _class;
}
set
{
_class = value;
}
}
private int _grade;
public virtual int Grade
{
get
{
return _grade;
}
set
{
_grade = value;
}
}

}
class Undergraduate : Student
{
private string _department;
public string Department
{
get
{
return _department;
}
set
{
_department = value;
}
}

public override int Grade
{
get
{
return base.Grade;
}
set
{
if (value >=1 && value <=4)
{
base.Grade = value;
}
}
}
}
class Graduate : Student
{
private string O_tutor;
public string Tutor
{
get
{
return O_tutor;
}
set
{
O_tutor = value;
}
}

public override int Grade
{
get
{
return base.Grade;
}
set
{
if (value >= 1 && value <= 3)
{
base.Grade = value;
}
}
}
}
}