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
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text; namespace JJW.Model
{
public class UserInfo
{
public int ID { get; set; }
public string UserName { get; set; }
public string PassWord { get; set; }
}
}
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
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Data;
using System.Data.SqlClient; namespace JJW.DAL
{
public static class SqlHelper
{
private static readonly string conStr = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;
public static DataTable GetTable(string sql, CommandType type, params SqlParameter[] ps)
{
using (SqlConnection con = new SqlConnection(conStr))
{
using (SqlDataAdapter sda = new SqlDataAdapter(sql, con))
{
DataTable dt = new DataTable();
sda.SelectCommand.CommandType = type;
if (ps != null)
{
sda.SelectCommand.Parameters.AddRange(ps);
}
sda.Fill(dt);
return dt;
}
}
} public static int ExecuteNonQuery(string sql, CommandType type, params SqlParameter[] ps)
{
using (SqlConnection con = new SqlConnection(conStr))
{
using (SqlCommand cmd = new SqlCommand(sql, con))
{
cmd.CommandType = type;
if (ps != null)
{
cmd.Parameters.AddRange(ps);
}
con.Open();
return cmd.ExecuteNonQuery();
}
}
}
}
}
UserInfoDal.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using JJW.Model;
using System.Data;
using System.Data.SqlClient; namespace JJW.DAL
{
public class UserInfoDal
{
/// <summary>
/// 返回列表
/// </summary>
/// <returns></returns>
public List<UserInfo> GetEntity()
{
string sql = "SELECT * FROM userInfo";
DataTable dt = SqlHelper.GetTable(sql, CommandType.Text);
List<UserInfo> list = new List<UserInfo>();
if (dt.Rows.Count > )
{
foreach (DataRow dr in dt.Rows)
{
UserInfo userInfo = new UserInfo();
LoadEntity(userInfo, dr);
list.Add(userInfo);
}
}
return list;
}
/// <summary>
/// 将表转为属性
/// </summary>
/// <param name="userInfo"></param>
/// <param name="dr"></param>
private void LoadEntity(UserInfo userInfo, DataRow dr)
{
userInfo.ID = Convert.ToInt32(dr["id"]);
userInfo.UserName = dr["userName"] != DBNull.Value ? dr["userName"].ToString() : string.Empty;
userInfo.PassWord = dr["passWord"] != DBNull.Value ? dr["passWord"].ToString() : string.Empty;
}
/// <summary>
/// 删除
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public int DeleteEntity(int id)
{
string sql = "DELETE FROM userInfo WHERE id = @id";
return SqlHelper.ExecuteNonQuery(sql, CommandType.Text, new SqlParameter("@id", id));
}
/// <summary>
/// 插入
/// </summary>
/// <param name="userName"></param>
/// <param name="passWord"></param>
/// <returns></returns>
public int InsertEntity(UserInfo userInfo)
{
string sql = "INSERT INTO userInfo(userName,passWord) VALUES(@userName,@passWord)";
return SqlHelper.ExecuteNonQuery(sql, CommandType.Text, new SqlParameter[]{
new SqlParameter("@userName",userInfo.UserName),new SqlParameter("@passWord",userInfo.PassWord)
});
}
/// <summary>
/// 修改
/// </summary>
/// <param name="userName"></param>
/// <param name="passWord"></param>
/// <param name="id"></param>
/// <returns></returns>
public int UpdateEntity(UserInfo userInfo)
{
string sql = "UPDATE userInfo SET userName=@userName, passWord=@passWord WHERE id=@id";
SqlParameter[] ps = {new SqlParameter("@userName",SqlDbType.NVarChar,),new SqlParameter("@passWord",SqlDbType.NVarChar,),new SqlParameter("@id",SqlDbType.Int,) };
return SqlHelper.ExecuteNonQuery(sql, CommandType.Text, new SqlParameter[]{
new SqlParameter("@userName",userInfo.UserName),new SqlParameter("@passWord",userInfo.PassWord),new SqlParameter("@id",userInfo.ID)
});
}
/// <summary>
/// 详细
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public UserInfo ShowDetail(int id)
{
string sql = "SELECT * FROM userInfo WHERE id = @id";
DataTable dt = SqlHelper.GetTable(sql, CommandType.Text, new SqlParameter("@id", id));
UserInfo userInfo = new UserInfo();
if (dt.Rows.Count > )
{
LoadEntity(userInfo, dt.Rows[]);
}
return userInfo;
}
}
}
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
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using JJW.Model; namespace JJW.BLL
{
public class UserInfoBll
{
DAL.UserInfoDal UserInfoDal = new DAL.UserInfoDal();
public List<UserInfo> GetEntity()
{
return UserInfoDal.GetEntity();
}
public int DeleteEntity(int id)
{
return UserInfoDal.DeleteEntity(id);
}
public int InsertEntity(UserInfo userInfo)
{
return UserInfoDal.InsertEntity(userInfo);
}
public int UpdateEntity(UserInfo userInfo)
{
return UserInfoDal.UpdateEntity(userInfo);
}
public UserInfo ShowDetail(int id)
{
return UserInfoDal.ShowDetail(id);
}
}
}
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。
<?xml version="1.0" encoding="utf-8"?> <!--
有关如何配置 ASP.NET 应用程序的详细消息，请访问
http://go.microsoft.com/fwlink/?LinkId=169433
--> <configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<connectionStrings>
<!--<add connectionString="data source=.;initial catalog=jjwdb;integrated security=true;" name="conStr"/>-->
<add connectionString="server=.;uid=sa;pwd=123;database=jjwdb;" name="conStr"/>
</connectionStrings>
</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
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using JJW.Model; namespace JJW.WebApp
{
/// <summary>
/// Add 的摘要说明
/// </summary>
public class Add : IHttpHandler
{ public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
UserInfo userInfo = new UserInfo();
userInfo.UserName = context.Request["userName"];
userInfo.PassWord = context.Request["passWord"];
BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll();
UserInfoBll.InsertEntity(userInfo);
context.Response.Redirect("UserInfoList.ashx");
} public bool IsReusable
{
get
{
return false;
}
}
}
}
Add.html
<!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>
<title></title>
</head>
<body>
<form action="Add.ashx" method="post">
<table border="">
<tr>
<td>用户名</td>
<td><input type="text" name="userName"/></td>
</tr>
<tr>
<td>密码</td>
<td><input type="text" name="passWord"/></td>
</tr>
<tr>
<td colspan=""><input type="submit" value="提交"/></td>
</tr>
</table>
</form>
</body>
</html>
DeleteUser.ashx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web; namespace JJW.WebApp
{
/// <summary>
/// DeleteUser 的摘要说明
/// </summary>
public class DeleteUser : IHttpHandler
{ public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
int id = Convert.ToInt32(context.Request["id"]);
BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll();
UserInfoBll.DeleteEntity(id);
context.Response.Redirect("UserInfoList.ashx"); } public bool IsReusable
{
get
{
return false;
}
}
}
}
ShowDetail.ashx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using JJW.Model; namespace JJW.WebApp
{
/// <summary>
/// ShowDetail 的摘要说明
/// </summary>
public class ShowDetail : IHttpHandler
{ public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
string filePath = context.Request.MapPath("ShowDetail.html");
string fileContent = File.ReadAllText(filePath);
int id = Convert.ToInt32(context.Request["id"]);
BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll();
UserInfo userInfo = UserInfoBll.ShowDetail(id);
fileContent = fileContent.Replace("$id", userInfo.ID.ToString()).Replace("$userName", userInfo.UserName).Replace("$passWord", userInfo.PassWord);
context.Response.Write(fileContent); } public bool IsReusable
{
get
{
return false;
}
}
}
}
ShowDetail.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<table border="">
<tr>
<td>ID</td>
<td>$id</td>
</tr>
<tr>
<td>用户名</td>
<td>$userName</td>
</tr>
<tr>
<td>密码</td>
<td>$passWord</td>
</tr>
</table>
</body>
</html>
Update.ashx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using JJW.Model;
using System.IO; namespace JJW.WebApp
{
/// <summary>
/// Update 的摘要说明
/// </summary>
public class Update : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
int id;
if (int.TryParse((context.Request["id"]), out id))
{
BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll();
UserInfo userInfo = UserInfoBll.ShowDetail(id);
//userInfo.UserName = context.Request["userName"];
//userInfo.PassWord = context.Request["passWord"];
//UserInfoBll.UpdateEntity(userInfo); string filePath = context.Request.MapPath("Update.html");
string fileContent = File.ReadAllText(filePath);
fileContent = fileContent.Replace("$userName", userInfo.UserName).Replace("$passWord", userInfo.PassWord).Replace("$id",userInfo.ID.ToString());
context.Response.Write(fileContent);
//context.Response.Redirect("UserInfoList.ashx");
} } public bool IsReusable
{
get
{
return false;
}
}
}
}
Update.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<form action="Update2.ashx" method="post">
<input type="hidden" name="id" value="$id" />
<table>
<tr>
<td>
用户名
</td>
<td>
<input type="text" name="userName" value="$userName" />
</td>
</tr>
<tr>
<td>
密码
</td>
<td>
<input type="text" name="passWord" value="$passWord" />
</td>
</tr>
<tr>
<td colspan="">
<input type="submit" value="提交" />
</td>
</tr>
</table>
</form>
</body>
</html>
Update2.ashx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using JJW.Model; namespace JJW.WebApp
{
/// <summary>
/// Update2 的摘要说明
/// </summary>
public class Update2 : IHttpHandler
{ public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
UserInfo userInfo = new UserInfo();
userInfo.ID = Convert.ToInt32(context.Request["id"]);
userInfo.UserName = context.Request["userName"].ToString();
userInfo.PassWord = context.Request["passWord"].ToString();
BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll();
UserInfoBll.UpdateEntity(userInfo);
context.Response.Redirect("UserInfoList.ashx");
} public bool IsReusable
{
get
{
return false;
}
}
}
}
UserInfoList.ashx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using JJW.Model;
using System.Text; namespace JJW.WebApp
{
/// <summary>
/// UserInfoList 的摘要说明
/// </summary>
public class UserInfoList : IHttpHandler
{ public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
string filePath = context.Request.MapPath("UserInfoList.html");
string fileContent = File.ReadAllText(filePath);
BLL.UserInfoBll UserInfoBll = new BLL.UserInfoBll();
List<UserInfo> list = UserInfoBll.GetEntity();
StringBuilder sb = new StringBuilder();
foreach (UserInfo userInfo in list)
{
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);
}
fileContent = fileContent.Replace("$tbody", sb.ToString());
context.Response.Write(fileContent);
} public bool IsReusable
{
get
{
return false;
}
}
}
}
UserInfoLIst.html
<!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>
<title></title>
</head>
<body>
<h1>用户表</h1>
<a href ="Add.html">添加用户</a>
<table border="">
<tr>
<th>
ID
</th>
<th>
用户名
</th>
<th>
密码
</th>
<th>
修改
</th>
<th>
删除
</th>
<th>
详细
</th>
</tr>
$tbody
</table>
</body>
</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(#^.^#)