步步为营 .NET三层架构解析四、Model设计(四种设计方式)

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;
    }
}