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.