说明（2017-10-6 11:21:58）：
1. 十一放假在家也没写几行代码，本来还想着利用假期把asp.net看完，结果天天喝酒睡觉，回去的票也没买到，惨。。
2. 断断续续的把用户信息的页面写完了，用了三层的方法，之前一直也没记下来，忘了的时候，每次都是从视频里找，这次好歹也要写下来，方便以后抄。
3. 希望十月份能把asp.net学完，然后看传说中的MVC。
代码：
1. 结构图
2. 建立三个类库，一个空web应用程序。DAL引Model，BLL引DAL和Model，WebApp引Model和BLL，反正各种引用。
3. Model里建一个UserInfo类，里面是用户字段和属性。
UserInfo.cs
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 namespace JJW.Model 7 { 8 public class UserInfo 9 { 10 public int ID { get; set; } 11 public string UserName { get; set; } 12 public string PassWord { get; set; } 13 } 14 }
4. DAL里有两个类，一个SqlHelper类，里面有两个方法GetTable和ExecuteNonQuery，GetTable负责查询，ExecuteNonQuery负责增删改。另一个UserInfoDal类，里面调用SqlHelper类，细化了增删改查的方法。三层里最重要的就是这个DAL层了。
SqlHelper.cs
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Configuration; 6 using System.Data; 7 using System.Data.SqlClient; 8 9 namespace JJW.DAL 10 { 11 public static class SqlHelper 12 { 13 private static readonly string conStr = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString; 14 public static DataTable GetTable(string sql, CommandType type, params SqlParameter[] ps) 15 { 16 using (SqlConnection con = new SqlConnection(conStr)) 17 { 18 using (SqlDataAdapter sda = new SqlDataAdapter(sql, con)) 19 { 20 DataTable dt = new DataTable(); 21 sda.SelectCommand.CommandType = type; 22 if (ps != null) 23 { 24 sda.SelectCommand.Parameters.AddRange(ps); 25 } 26 sda.Fill(dt); 27 return dt; 28 } 29 } 30 } 31 32 public static int ExecuteNonQuery(string sql, CommandType type, params SqlParameter[] ps) 33 { 34 using (SqlConnection con = new SqlConnection(conStr)) 35 { 36 using (SqlCommand cmd = new SqlCommand(sql, con)) 37 { 38 cmd.CommandType = type; 39 if (ps != null) 40 { 41 cmd.Parameters.AddRange(ps); 42 } 43 con.Open(); 44 return cmd.ExecuteNonQuery(); 45 } 46 } 47 } 48 } 49 }
UserInfoDal.cs
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using JJW.Model; 6 using System.Data; 7 using System.Data.SqlClient; 8 9 namespace JJW.DAL 10 { 11 public class UserInfoDal 12 { 13 /// <summary> 14 /// 返回列表 15 /// </summary> 16 /// <returns></returns> 17 public List<UserInfo> GetEntity() 18 { 19 string sql = "SELECT * FROM userInfo"; 20 DataTable dt = SqlHelper.GetTable(sql, CommandType.Text); 21 List<UserInfo> list = new List<UserInfo>(); 22 if (dt.Rows.Count > 0) 23 { 24 foreach (DataRow dr in dt.Rows) 25 { 26 UserInfo userInfo = new UserInfo(); 27 LoadEntity(userInfo, dr); 28 list.Add(userInfo); 29 } 30 } 31 return list; 32 } 33 /// <summary> 34 /// 将表转为属性 35 /// </summary> 36 /// <param name="userInfo"></param> 37 /// <param name="dr"></param> 38 private void LoadEntity(UserInfo userInfo, DataRow dr) 39 { 40 userInfo.ID = Convert.ToInt32(dr["id"]); 41 userInfo.UserName = dr["userName"] != DBNull.Value ? dr["userName"].ToString() : string.Empty; 42 userInfo.PassWord = dr["passWord"] != DBNull.Value ? dr["passWord"].ToString() : string.Empty; 43 } 44 /// <summary> 45 /// 删除 46 /// </summary> 47 /// <param name="id"></param> 48 /// <returns></returns> 49 public int DeleteEntity(int id) 50 { 51 string sql = "DELETE FROM userInfo WHERE id = @id"; 52 return SqlHelper.ExecuteNonQuery(sql, CommandType.Text, new SqlParameter("@id", id)); 53 } 54 /// <summary> 55 /// 插入 56 /// </summary> 57 /// <param name="userName"></param> 58 /// <param name="passWord"></param> 59 /// <returns></returns> 60 public int InsertEntity(UserInfo userInfo) 61 { 62 string sql = "INSERT INTO userInfo(userName,passWord) VALUES(@userName,@passWord)"; 63 return SqlHelper.ExecuteNonQuery(sql, CommandType.Text, new SqlParameter[]{ 64 new SqlParameter("@userName",userInfo.UserName),new SqlParameter("@passWord",userInfo.PassWord) 65 }); 66 } 67 /// <summary> 68 /// 修改 69 /// </summary> 70 /// <param name="userName"></param> 71 /// <param name="passWord"></param> 72 /// <param name="id"></param> 73 /// <returns></returns> 74 public int UpdateEntity(UserInfo userInfo) 75 { 76 string sql = "UPDATE userInfo SET userName=@userName, passWord=@passWord WHERE id=@id"; 77 SqlParameter[] ps = {new SqlParameter("@userName",SqlDbType.NVarChar,32),new SqlParameter("@passWord",SqlDbType.NVarChar,32),new SqlParameter("@id",SqlDbType.Int,4) }; 78 return SqlHelper.ExecuteNonQuery(sql, CommandType.Text, new SqlParameter[]{ 79 new SqlParameter("@userName",userInfo.UserName),new SqlParameter("@passWord",userInfo.PassWord),new SqlParameter("@id",userInfo.ID) 80 }); 81 } 82 /// <summary> 83 /// 详细 84 /// </summary> 85 /// <param name="id"></param> 86 /// <returns></returns> 87 public UserInfo ShowDetail(int id) 88 { 89 string sql = "SELECT * FROM userInfo WHERE id = @id"; 90 DataTable dt = SqlHelper.GetTable(sql, CommandType.Text, new SqlParameter("@id", id)); 91 UserInfo userInfo = new UserInfo(); 92 if (dt.Rows.Count > 0) 93 { 94 LoadEntity(userInfo, dt.Rows[0]); 95 } 96 return userInfo; 97 } 98 } 99 }
5. BLL层，里面就是把DAL层里的每个方法返回一个值，感觉BLL层没什么用，可能就是DAL层和UI层之间的一个桥梁吧，避免DAL层直接暴露在UI层里。BLL层里只有一个方法UserInfoBll。
UserInfoBll.cs
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using JJW.Model; 6 7 namespace JJW.BLL 8 { 9 public class UserInfoBll 10 { 11 DAL.UserInfoDal UserInfoDal = new DAL.UserInfoDal(); 12 public List<UserInfo> GetEntity() 13 { 14 return UserInfoDal.GetEntity(); 15 } 16 public int DeleteEntity(int id) 17 { 18 return UserInfoDal.DeleteEntity(id); 19 } 20 public int InsertEntity(UserInfo userInfo) 21 { 22 return UserInfoDal.InsertEntity(userInfo); 23 } 24 public int UpdateEntity(UserInfo userInfo) 25 { 26 return UserInfoDal.UpdateEntity(userInfo); 27 } 28 public UserInfo ShowDetail(int id) 29 { 30 return UserInfoDal.ShowDetail(id); 31 } 32 } 33 }
6. 最后的UI层，也就是WebApp。里面就是增删改查的页面，目前用的都是ashx一般处理程序，后面可能会改成aspx。
首先是web.config设置，这里面有两套登录设置，一个是本地，一个是用户名。
1 <?xml version="1.0" encoding="utf-8"?> 2 3 <!-- 4 有关如何配置 ASP.NET 应用程序的详细消息，请访问 5 http://go.microsoft.com/fwlink/?LinkId=169433 6 --> 7 8 <configuration> 9 <system.web> 10 <compilation debug="true" targetFramework="4.0" /> 11 </system.web> 12 <connectionStrings> 13 <!--<add connectionString="data source=.;initial catalog=jjwdb;integrated security=true;" name="conStr"/>--> 14 <add connectionString="server=.;uid=sa;pwd=123;database=jjwdb;" name="conStr"/> 15 </connectionStrings> 16 </configuration>
后面是一堆页面，虽然网上粘很繁琐，但为了以后抄的方便，没办法啊。。而且为了不漏下，按字母顺序粘了。
Add.ashx
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using JJW.Model; 6 7 namespace JJW.WebApp 8 { 9 /// <summary> 10 /// Add 的摘要说明 11 /// </summary> 12 public class Add : IHttpHandler 13 { 14 15 public void ProcessRequest(HttpContext context) 16 { 17 context.Response.ContentType = "text/html"; 18 UserInfo userInfo = new UserInfo(); 19 userInfo.UserName = context.Request["userName"]; 20 userInfo.PassWord = context.Request["passWord"]; 21 BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll(); 22 UserInfoBll.InsertEntity(userInfo); 23 context.Response.Redirect("UserInfoList.ashx"); 24 } 25 26 public bool IsReusable 27 { 28 get 29 { 30 return false; 31 } 32 } 33 } 34 }
Add.html
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 </head> 6 <body> 7 <form action="Add.ashx" method="post"> 8 <table border="1"> 9 <tr> 10 <td>用户名</td> 11 <td><input type="text" name="userName"/></td> 12 </tr> 13 <tr> 14 <td>密码</td> 15 <td><input type="text" name="passWord"/></td> 16 </tr> 17 <tr> 18 <td colspan="2"><input type="submit" value="提交"/></td> 19 </tr> 20 </table> 21 </form> 22 </body> 23 </html>
DeleteUser.ashx
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 6 namespace JJW.WebApp 7 { 8 /// <summary> 9 /// DeleteUser 的摘要说明 10 /// </summary> 11 public class DeleteUser : IHttpHandler 12 { 13 14 public void ProcessRequest(HttpContext context) 15 { 16 context.Response.ContentType = "text/html"; 17 int id = Convert.ToInt32(context.Request["id"]); 18 BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll(); 19 UserInfoBll.DeleteEntity(id); 20 context.Response.Redirect("UserInfoList.ashx"); 21 22 } 23 24 public bool IsReusable 25 { 26 get 27 { 28 return false; 29 } 30 } 31 } 32 }
ShowDetail.ashx
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using System.IO; 6 using JJW.Model; 7 8 namespace JJW.WebApp 9 { 10 /// <summary> 11 /// ShowDetail 的摘要说明 12 /// </summary> 13 public class ShowDetail : IHttpHandler 14 { 15 16 public void ProcessRequest(HttpContext context) 17 { 18 context.Response.ContentType = "text/html"; 19 string filePath = context.Request.MapPath("ShowDetail.html"); 20 string fileContent = File.ReadAllText(filePath); 21 int id = Convert.ToInt32(context.Request["id"]); 22 BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll(); 23 UserInfo userInfo = UserInfoBll.ShowDetail(id); 24 fileContent = fileContent.Replace("$id", userInfo.ID.ToString()).Replace("$userName", userInfo.UserName).Replace("$passWord", userInfo.PassWord); 25 context.Response.Write(fileContent); 26 27 28 } 29 30 public bool IsReusable 31 { 32 get 33 { 34 return false; 35 } 36 } 37 } 38 }
ShowDetail.html
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 </head> 6 <body> 7 <table border="1"> 8 <tr> 9 <td>ID</td> 10 <td>$id</td> 11 </tr> 12 <tr> 13 <td>用户名</td> 14 <td>$userName</td> 15 </tr> 16 <tr> 17 <td>密码</td> 18 <td>$passWord</td> 19 </tr> 20 </table> 21 </body> 22 </html>
Update.ashx
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using JJW.Model; 6 using System.IO; 7 8 namespace JJW.WebApp 9 { 10 /// <summary> 11 /// Update 的摘要说明 12 /// </summary> 13 public class Update : IHttpHandler 14 { 15 public void ProcessRequest(HttpContext context) 16 { 17 context.Response.ContentType = "text/html"; 18 int id; 19 if (int.TryParse((context.Request["id"]), out id)) 20 { 21 BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll(); 22 UserInfo userInfo = UserInfoBll.ShowDetail(id); 23 //userInfo.UserName = context.Request["userName"]; 24 //userInfo.PassWord = context.Request["passWord"]; 25 //UserInfoBll.UpdateEntity(userInfo); 26 27 string filePath = context.Request.MapPath("Update.html"); 28 string fileContent = File.ReadAllText(filePath); 29 fileContent = fileContent.Replace("$userName", userInfo.UserName).Replace("$passWord", userInfo.PassWord).Replace("$id",userInfo.ID.ToString()); 30 context.Response.Write(fileContent); 31 //context.Response.Redirect("UserInfoList.ashx"); 32 } 33 34 } 35 36 public bool IsReusable 37 { 38 get 39 { 40 return false; 41 } 42 } 43 } 44 }
Update.html
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 </head> 6 <body> 7 <form action="Update2.ashx" method="post"> 8 <input type="hidden" name="id" value="$id" /> 9 <table> 10 <tr> 11 <td> 12 用户名 13 </td> 14 <td> 15 <input type="text" name="userName" value="$userName" /> 16 </td> 17 </tr> 18 <tr> 19 <td> 20 密码 21 </td> 22 <td> 23 <input type="text" name="passWord" value="$passWord" /> 24 </td> 25 </tr> 26 <tr> 27 <td colspan="2"> 28 <input type="submit" value="提交" /> 29 </td> 30 </tr> 31 </table> 32 </form> 33 </body> 34 </html>
Update2.ashx
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using JJW.Model; 6 7 namespace JJW.WebApp 8 { 9 /// <summary> 10 /// Update2 的摘要说明 11 /// </summary> 12 public class Update2 : IHttpHandler 13 { 14 15 public void ProcessRequest(HttpContext context) 16 { 17 context.Response.ContentType = "text/html"; 18 UserInfo userInfo = new UserInfo(); 19 userInfo.ID = Convert.ToInt32(context.Request["id"]); 20 userInfo.UserName = context.Request["userName"].ToString(); 21 userInfo.PassWord = context.Request["passWord"].ToString(); 22 BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll(); 23 UserInfoBll.UpdateEntity(userInfo); 24 context.Response.Redirect("UserInfoList.ashx"); 25 } 26 27 public bool IsReusable 28 { 29 get 30 { 31 return false; 32 } 33 } 34 } 35 }
UserInfoList.ashx
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using System.IO; 6 using JJW.Model; 7 using System.Text; 8 9 namespace JJW.WebApp 10 { 11 /// <summary> 12 /// UserInfoList 的摘要说明 13 /// </summary> 14 public class UserInfoList : IHttpHandler 15 { 16 17 public void ProcessRequest(HttpContext context) 18 { 19 context.Response.ContentType = "text/html"; 20 string filePath = context.Request.MapPath("UserInfoList.html"); 21 string fileContent = File.ReadAllText(filePath); 22 BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll(); 23 List<UserInfo> list = UserInfoBll.GetEntity(); 24 StringBuilder sb = new StringBuilder(); 25 foreach (UserInfo userInfo in list) 26 { 27 sb.AppendFormat("<tr><td>{0}</td><td>{1}</td><td>{2}</td><td><a href='Update.ashx?id={0}'>修改</a></td><td><a href='DeleteUser.ashx?id={0}'>删除</a></td><td><a href='ShowDetail.ashx?id={0}'>详细</a></td></tr>", userInfo.ID, userInfo.UserName, userInfo.PassWord); 28 } 29 fileContent = fileContent.Replace("$tbody", sb.ToString()); 30 context.Response.Write(fileContent); 31 } 32 33 public bool IsReusable 34 { 35 get 36 { 37 return false; 38 } 39 } 40 } 41 }
UserInfoLIst.html
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 </head> 6 <body> 7 <h1>用户表</h1> 8 <a href ="Add.html">添加用户</a> 9 <table border="1"> 10 <tr> 11 <th> 12 ID 13 </th> 14 <th> 15 用户名 16 </th> 17 <th> 18 密码 19 </th> 20 <th> 21 修改 22 </th> 23 <th> 24 删除 25 </th> 26 <th> 27 详细 28 </th> 29 </tr> 30 $tbody 31 </table> 32 </body> 33 </html>
运行结果：
总结：
至今没有一天之内完整的写一遍，其实需要每天都练习的，里面有很多细节，特别是DAL层里的数据库操作，再次许愿，十月份能把asp.net部分学习完！嘻嘻(#^.^#)