说到Model设计,我们先谈谈它的作用:
Model又叫实体类，model层里面的一个类对应数据库里面的一张表， 类里面的每一个属性对应表里面的一个字段，每个属性都有自己的 GET 和 SET 方法， 项目中的数据存取都要依靠GET和SET方法来实现.确切的说它不属于纵向的哪一层，而是所有层都要用到的业务实体层。其实最主要的作用还是用来传递参数.
下面我就用四种方式来创建Model类:
方式一：
创建department的实体类department.cs:
public class department |
{ |
private int _id; |
private string _departname; |
private string _description; |
public int id |
{ |
set { _id = value; } |
get { return _id; } |
} |
public string departname |
{ |
set { _departname = value; } |
get { return _departname; } |
} |
public string description |
{ |
set { _description = value; } |
get { return _description; } |
} |
} |
再来创建custom的实体类custom.cs:
public class custom |
{ |
private int _id; |
private string _cname; |
private string _ename; |
private int _departID; |
private int _age; |
private string _password; |
private string _departname; |
public string departname |
{ |
set { _departname = value; } |
get { return _departname; } |
} |
public int id |
{ |
set { _id = value; } |
get { return _id; } |
} |
public string cname |
{ |
set { _cname = value; } |
get { return _cname; } |
} |
public string ename |
{ |
set { _ename = value; } |
get { return _ename; } |
} |
public int departID |
{ |
set { _departID = value; } |
get { return _departID; } |
} |
public int age |
{ |
set { _age = value; } |
get { return _age; } |
} |
public string password |
{ |
set { _password = value; } |
get { return _password; } |
} |
} |
实体类我们就建好了,其实也有一种更简化方式,效果和上面是一样的:
方式二：
department.cs
public class department |
{ |
public int id |
{ |
set ; |
get; |
} |
public string departname |
{ |
set ; |
get ; |
} |
public string description |
{ |
set; |
get ; |
} |
} |
custom.cs:
public class custom |
{ |
public string departname |
{ |
set ; |
get; |
} |
public int id |
{ |
set ; |
get; |
} |
public string cname |
{ |
set ; |
get; |
} |
public string ename |
{ |
set; |
get ; |
} |
public int departID |
{ |
set; |
get ; |
} |
public int age |
{ |
set; |
get; |
} |
public string password |
{ |
set ; |
get; |
} |
} |
也可采用如下这种方式创建:
方式三：
custom.cs:
public class custom |
{ |
private int _id; |
private string _cname; |
private string _ename; |
private int _departID; |
private int _age; |
private string _password; |
private string _departname; |
public string departname |
{ |
get { return _departname; } |
} |
public int id |
{ |
get { return _id; } |
} |
public string cname |
{ |
get { return _cname; } |
} |
public string ename |
{ |
get { return _ename; } |
} |
public int departID |
{ |
get { return _departID; } |
} |
public int age |
{ |
get { return _age; } |
} |
public string password |
{ |
get { return _password; } |
} |
public custom(int ID,string DepartName,string CName,string EName,int DepartID,int Age,string PassWord ) |
{ |
_id = ID; |
_departname = DepartName; |
_cname = CName; |
_ename = EName; |
_departID = DepartID; |
_age = Age; |
_password = PassWord; |
} |
} |
department.cs:
public class department |
{ |
private int _id; |
private string _departname; |
private string _description; |
public int id |
{ |
set { _id = value; } |
} |
public string departname |
{ |
set { _departname = value; } |
} |
public string description |
{ |
set { _description = value; } |
} |
public department(int ID,string DepartName,string Description) |
{ |
_id = ID; |
_departname = DepartName; |
_description = Description; |
} |
} |
还有一种方式就是结合方式一和方式三来设计
方式四:
custom.cs:
public class custom |
{ |
private int _id; |
private string _cname; |
private string _ename; |
private int _departID; |
private int _age; |
private string _password; |
private string _departname; |
public string departname |
{ |
set { _departname = value; } |
get { return _departname; } |
} |
public int id |
{ |
set { _id = value; } |
get { return _id; } |
} |
public string cname |
{ |
set { _cname = value; } |
get { return _cname; } |
} |
public string ename |
{ |
set { _ename = value; } |
get { return _ename; } |
} |
public int departID |
{ |
set { _departID = value; } |
get { return _departID; } |
} |
public int age |
{ |
set { _age = value; } |
get { return _age; } |
} |
public string password |
{ |
set { _password = value; } |
get { return _password; } |
} |
public custom() |
{ } |
public custom(int ID, string DepartName, string CName, string EName, int DepartID, int Age, string PassWord) |
{ |
_id = ID; |
_departname = DepartName; |
_cname = CName; |
_ename = EName; |
_departID = DepartID; |
_age = Age; |
_password = PassWord; |
} |
} |
department.cs:
public class department |
{ |
private int _id; |
private string _departname; |
private string _description; |
public int id |
{ |
set { _id = value; } |
get { return _id; } |
} |
public string departname |
{ |
set { _departname = value; } |
get { return _departname; } |
} |
public string description |
{ |
set { _description = value; } |
get { return _description; } |
} |
public department() |
{ } |
public department(int ID, string DepartName, string Description) |
{ |
_id = ID; |
_departname = DepartName; |
_description = Description; |
} |
} |
方式三的赋值和方式一 方式二是不同的。我们采用的是方式一来设计。
其种各种方式的优缺点我就不讲了,代码己说明很清楚了.
Model类建好了,我们就要开始创建DAL类库了,这是三层架构中的核心部分,下回分解,敬请拍砖.
http://www.cnblogs.com/springyangwc/archive/2011/03/24/1994281.html