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最简单,最适合入门学习的三层架构例子

2008-10-07 16:46 447 查看

1.打开VS2008后，文件-->新建-->项目-->其他项目类型-->Visual Studio 解决方案-->空白解决方案就起名为:MvcTest 吧

2.建立如图

附件: 您所在的用户组无法下载或查看附件的项目,并在WEB-->App_Data建一个数据文件 DabaBase.mdf 里面建表:qzzm_user 表内:字段Name,类型:nvarchar(50)

3.在WEB中引用BLL,Model层新建Post.aspx

[运行代码] [复制到剪贴板] [ ± ]

CODE:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Post.aspx.cs" Inherits="Post" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title>无标题页</title>

</head>

<body>

<form id="form1" runat="server">

<div>

<asp:TextBox ID="tb_name" runat="server"></asp:TextBox>

<asp:Button ID="btn_post" runat="server" onclick="btn_post_Click" Text="提交" />

</div>

</form>

</body>

</html>

Post.aspx.cs 先搁下等写好类库再写

4.在Model 实体类中新建一个user.cs的类

[运行代码] [复制到剪贴板] [ ± ]

CODE:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Model

{

public class user

{

public user() { }

private string _Name;

public string Name

{

set { _Name = value; }

get { return _Name; }

}

}

}

5.在DAL新建userdb.cs,并引用Model层

[运行代码] [复制到剪贴板] [ ± ]

CODE:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;

using System.Configuration;

namespace DAL

{

public class userdb

{

public bool adduser(Model.user model)

{

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["sqlconn"].ConnectionString);

con.Open();

using (SqlCommand cmd = new SqlCommand("INSERT INTO qzzm_user(Name) VALUES(@Name)", con))

{

cmd.Parameters.AddWithValue("@Name", model.Name);

if (cmd.ExecuteNonQuery() > 0)

return true;

else return false;

}

}

}

}

6.在BLL中新建userbll.cs并引用DAL,Model层

[运行代码] [复制到剪贴板] [ ± ]

CODE:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace BLL

{

public class userbll

{

DAL.userdb db = new DAL.userdb();

public bool adduser(Model.user model)

{

return db.adduser(model);

}

}

}

7.可以开始写Post.aspx.cs了

[运行代码] [复制到剪贴板] [ ± ]

CODE:

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class Post : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void btn_post_Click(object sender, EventArgs e)

{

Model.user us = new Model.user();

us.Name = tb_name.Text;

BLL.userbll ub = new BLL.userbll();

ub.adduser(us);

}

}

8.补充之前少写的Web.config的数据链接字符串

[运行代码] [复制到剪贴板] [ ± ]

CODE:

<connectionStrings>

<add name="sqlconn" connectionString="Data Source=./SQLEXPRESS;AttachDbFilename=|DataDirectory|/Database.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"/>

</connectionStrings>

最后,说下各层的引用关系:

1) WEB引用 DAL,Model

2)BLL引用 DAL,Model

3)DAL引用Model

4)Model无引用

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