MVC三层架构的示例分析
MVC三层架构的示例分析,针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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前几天收到CodeProject的电邮,asp.net mvc 的E文教程正在编写,一个老外蛮伟大的,免费贡献***章,也有100多页的内容。其中大量应用了LINQ技术(看来得花时间看看了,用统一的方式来面对所有数据源,确实还是蛮吸引人的)。当然,LINQ不是MVC必须的,你可以用很多技术实现,比如NHibernate,甚至原生的ADO.NET。
既然是实例,我直接上代码了,基础理论一搜一大把,但我还是觉得实践才是最重要的:
ASP.NET MVC三层架构实例:首先的数据访问层,Database类:
using System; using System.Data; using System.Configuration; 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; using System.Data.SqlClient; namespace northWind3Tier.DataAccessLayer { /// < summary> /// 用于数据访问 /// < /summary> public class Database { /// < summary> /// 数据库连接 /// < /summary> protected SqlConnection conn; /// < summary> /// 数据库连接字符串 /// < /summary> protected string connStr; public Database() { this.connStr = ConfigurationManager.ConnectionStrings["DBConnectionString"].ConnectionString; } /// < summary> /// 关闭数据库连接 /// < /summary> ~Database()//析构函数不带访问修饰符 { try { if (conn != null) { conn.Close(); } } catch { } } /// < summary> /// 打开数据库连接 /// < /summary> protected void Open() { if (conn == null) { conn = new SqlConnection(connStr); } if (conn.State.Equals(ConnectionState.Closed)) { conn.Open(); } } /// < summary> /// 关闭数据库连接 /// < /summary> protected void Close() { if (conn != null) { conn.Close(); } } /// < summary> /// 获取数据,返回一个dataset /// < /summary> /// < param name="sql">sql语句< /param> /// < returns>< /returns> public DataSet GetDataSet(string sql) { Open(); SqlDataAdapter adapter = new SqlDataAdapter(sql, conn); DataSet dataset = new DataSet(); adapter.Fill(dataset); Close(); return dataset; } } }
ASP.NET MVC三层架构实例:业务逻辑层 Category类:
using System; using System.Data; using System.Configuration; 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; using System.IO; using northWind3Tier.DataAccessLayer; namespace northWind3Tier.BusinessLayer { public class Category { /// < summary> /// 根据货物ID获取该货物的详细信息 /// < /summary> /// < param name="categoryID">< /param> public void LoadData(int categoryID) { Database db = new Database(); string sql = "select * from [Categories] where [CategoryID]="+categoryID; DataSet ds = db.GetDataSet(sql); //如果有查询到数据的话,填充属性 if (ds.Tables[0].Rows.Count > 0) { this.categoryID =(int) ds.Tables[0].Rows[0]["CategoryID"]; this.categoryName = ds.Tables[0].Rows[0]["CategoryName"].ToString(); this.description = ds.Tables[0].Rows[0]["Description"].ToString(); this.image =(byte[]) ds.Tables[0].Rows[0]["Picture"]; } } /// < summary> /// 字段和属性 /// < /summary> #region private int categoryID; /// < summary> /// 编号 /// < /summary> public int CategoryID { get { return categoryID; } set { categoryID = value; } } private string categoryName; /// < summary> /// 名称 /// < /summary> public string CategoryName { get { return categoryName; } set { categoryName = value; } } private string description; /// < summary> /// 说明 /// < /summary> public string Description { get { return description; } set { description = value; } } private byte[] image; /// < summary> /// 图像 /// < /summary> public byte[] Image { get { return image; } set { image = value; } } #endregion } }
ASP.NET MVC三层架构实例:***就是显示层,前台aspx代码:
< %@ Page Language="C#" AutoEventWireup="true" CodeBehind="CateqoryQuery.aspx.cs" Inherits="northWind3Tier.CateqoryQuery" %> < !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>Untitled Page< /title> < /head> < body> < form id="form1" runat="server"> < div> < asp:Label ID="Label1" runat="server" Text="货物编号(1-9):">< /asp:Label> < asp:TextBox ID="TextBox1" runat="server">< /asp:TextBox> < asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="查询" Width="65px" /> < br /> < br /> < asp:Label ID="lblCategoryInfo" runat="server" Text="Label">< /asp:Label> < br /> < asp:Image ID="Image1" runat="server" /> < /div> < /form> < /body> < /html>
ASP.NET MVC三层架构实例:后台cs代码:
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; using northWind3Tier.BusinessLayer; using System.IO; namespace northWind3Tier { public partial class CateqoryQuery : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { int categoryID = -1; if (TextBox1.Text != "") { try { categoryID = Convert.ToInt32(TextBox1.Text); //if ((categoryID < 1) || (categoryID > 9)) } catch { Response.Write("< mce:script type="text/javascript">< !-- alert('只能输入1-9之间的数字') // -->< /mce:script>"); return; } } Category category = new Category(); category.LoadData(categoryID); lblCategoryInfo.Text = "编号:" + category.CategoryID; lblCategoryInfo.Text += "< BR>名称:" + category.CategoryName; lblCategoryInfo.Text += "< BR>描述:" + category.Description; byte[] image = category.Image; //northwind数据库中的image字段(byte数组)的前面78是无用的,必须剔除才能正常显示图像 byte[] temp = new byte[image.Length - 78]; Array.Copy(image , 78, temp, 0, image.Length - 78); string strPath = "photo/temp.JPG"; string strPhotoPath =strPath; //保存图片文件 BinaryWriter bw = new BinaryWriter(File.Open(Server.MapPath (strPhotoPath), FileMode.OpenOrCreate)); bw.Write(temp); bw.Close(); //显示图片 this.Image1.ImageUrl = strPath; } } }
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