ASP.NET的一般处理程序对数据的基本操作
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时间：2015年06月09日
TableList.ashx：
<%@ WebHandler Language="C#" Class="TableList" %> using System; using System.Web; public class TableList : IHttpHandler { private BLL.TransferExecuteAction execute = new BLL.TransferExecuteAction(); public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; string con = System.IO.File.ReadAllText(CommonHelper.GetPhysicsPathOfFile(context, "DataList.html")); System.Text.StringBuilder sb = new System.Text.StringBuilder(500); foreach (Model.TableModel item in execute.ExecuteDataTable()) { int id = item.id; sb.Append("<tr>"); sb.Append("<td>" + item.id + "</td>"); sb.Append("<td>" + item.课程编号 + "</td>"); sb.Append("<td><img src=‘" + item.图书封面 + "‘ alt=‘‘/></td>"); sb.Append("<td>" + item.课程名称 + "</td>"); sb.Append("<td>" + item.学分 + "</td>"); sb.Append("<td><a href=‘javascript:Delete(" + id + ")‘>删</a> <a href=‘Modify.ashx?id=" + id + "‘>改</a></td>"); sb.Append("</tr>"); } sb.Append("<tr><td colspan=‘6‘><div style=‘float:right‘><a href=‘Add.ashx‘>增</a> </div></td></tr>"); context.Response.Write(con.Replace("{@trs}", sb.ToString())); } public bool IsReusable { get { return false; } } }
DataList.html：
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>数据列表</title> <style type="text/css"> tr td { padding: 3px; margin: 3px auto; } </style> <script type="text/javascript"> function Delete(id) { if (confirm("确定要删除吗？")) { window.location = ‘Delete.ashx?id=‘ + id;//跳转到删除页面 } }; </script> </head> <body> <center> <h3>表单数据</h3> <table border="1"> <tr> <td>id</td> <td>课程编号</td> <td>图书封面</td> <td>课程名称</td> <td>学分</td> <td>操作</td> </tr> {@trs} </table> </center> </body> </html>
Add.ashx：
<%@ WebHandler Language="C#" Class="Add" %> using System; using System.Web; public class Add : IHttpHandler { private BLL.TransferExecuteAction execute = null; private Model.TableModel model = null; public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; //首次加载模版。 string emp = context.Request.Form["IsPostBack"], msg = string.Empty; //是否点击提交按钮 if (!string.IsNullOrEmpty(emp)) { model = new Model.TableModel(); model.课程编号 = context.Request.Form["num"]; model.课程名称 = context.Request.Form["name"]; model.图书封面 = context.Request.Form["face"]; int gra = 0; int.TryParse(context.Request.Form["grade"], out gra); model.学分 = (int?)gra; execute = new BLL.TransferExecuteAction(); if (1 == execute.ExecuteAddData(model)) msg = "数据添加成功"; else msg = "数据添加失败"; context.Response.Write(" <script>var time = 3;document.write(‘" + msg + "，<span id=\"time\" style=\"font-size:25px;color:red;\">3</span> 秒后自动跳转到数据列表页面。‘);setInterval(function () {if (time > 0) {time--;document.getElementById(\"time\").innerHTML = time;}else {window.location = ‘TableList.ashx‘;}}, 1000);</script>"); } else { string cont = System.IO.File.ReadAllText(CommonHelper.GetPhysicsPathOfFile(context, "OperationModel.html")); cont = cont.Replace("{@Operation}", "增加").Replace("{@id}", "").Replace("{@action}", "Add.ashx").Replace("{@num}", "") .Replace("{@face}", "").Replace("{@name}", "").Replace("{@grade}", ""); context.Response.Write(cont); } } public bool IsReusable { get { return false; } } }
Delete.ashx：
<%@ WebHandler Language="C#" Class="Delete" %> using System; using System.Web; public class Delete : IHttpHandler { private BLL.TransferExecuteAction execute = null; public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; string msg = string.Empty; execute = new BLL.TransferExecuteAction(); //是否点击提交按钮 int id = int.Parse(context.Request.QueryString["id"]); execute.ExecuteDeleteDataById(id); if ( 1== 1) { msg = "数据删除成功"; } else { msg = "数据删除失败"; } context.Response.Write(" <script type=\"text/javascript\">var time = 3;document.write(‘" + msg + "，<span id=\"time\" style=\"font-size:25px;color:red;\">3</span> 秒后自动跳转到数据列表页面。‘);setInterval(function () {if (time > 0) {time--;document.getElementById(\"time\").innerHTML = time;}else {window.location = ‘TableList.ashx‘;}}, 1000);</script>"); } public bool IsReusable { get { return false; } } }
Modify.ashx：
<%@ WebHandler Language="C#" Class="Modify" %> using System; using System.Web; public class Modify : IHttpHandler { private BLL.TransferExecuteAction execute = null; private Model.TableModel model = null; public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; execute = new BLL.TransferExecuteAction(); int id = -1; string cont = string.Empty, msg = string.Empty; if (!int.TryParse(context.Request.QueryString["id"], out id))//浏览器第二次post请求，表单传值，提交新的数据。 { id = int.Parse(context.Request.Form["id"]); if (id > -1) { model = new Model.TableModel(); model.id = int.Parse(context.Request.Form["id"]); model.课程编号 = context.Request.Form["num"]; model.课程名称 = context.Request.Form["name"]; model.图书封面 = context.Request.Form["face"]; int gra = 0; int.TryParse(context.Request.Form["grade"], out gra); model.学分 = (int?)gra; if (1 == execute.ExecuteModifyData(model)) msg = "数据更新成功"; else msg = "数据更新失败"; } else { msg = "参数错误，数据更新失败"; } cont = " <script>var time = 4;document.write(‘" + msg + "，<span id=\"time\" style=\"font-size:25px;color:red;\">3</span> 秒后自动跳转到数据列表页面。‘);setInterval(function () {if (time > 0) {time--;document.getElementById(\"time\").innerHTML = time;}else {window.location = ‘TableList.ashx‘;}}, 1000);</script>"; } else//浏览器第一次get请求，url传值，服务器返回真实数据 { model = execute.ExecuteModel(id); string num = model.课程编号; string name = model.课程名称; string face = model.图书封面; string grade = ((int?)model.学分).ToString(); cont = System.IO.File.ReadAllText(CommonHelper.GetPhysicsPathOfFile(context, "OperationModel.html")); cont = cont.Replace("{@Operation}", "更新").Replace("{@action}", "Modify.ashx").Replace("{@id}", id.ToString()).Replace("{@num}", num) .Replace("{@face}", face).Replace("{@name}", name).Replace("{@grade}", grade.ToString()); } context.Response.Write(cont); } public bool IsReusable { get { return false; } } }
OperationModel.html：
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <style type="text/css"> tr td { padding: 3px; margin: 3px auto; } </style> </head> <body> <center> <h3>{@Operation}数据</h3> <form action="{@action}" method="post"> <table border="0"> <tr> <td>id</td> <td><input type="text" name="id" value="{@id}" readonly="readonly"/></td></tr> <tr> <td>课程编号</td> <td><input type="text" name="num" value="{@num}"/></td></tr> <tr> <td>图书封面</td> <td><input type="text" name="face" value="{@face}"/></td></tr> <tr> <td>课程名称</td> <td><input type="text" name="name" value="{@name}"/></td></tr> <tr> <td>学分</td> <td><input type="text" name="grade" value="{@grade}"/></td></tr> <tr> <td><input type="submit" name="submit" value="确定" /></td> <td><input type="button" onclick="window.location = ‘TableList.ashx‘;" value="取消" /></td> </tr> </table> <input type="hidden" name="IsPostBack" value="1" /> </form> </center> </body> </html>
CommonHelper.cs:
public class CommonHelper { public CommonHelper() { } public static string GetPhysicsPathOfFile(HttpContext context, string fileName) { return context.Server.MapPath(fileName); } }
Web.config:
<?xml version="1.0"?> <!-- For more information on how to configure your ASP.NET application, please visit http://go.microsoft.com/fwlink/?LinkId=169433 --> <configuration> <system.web> <compilation debug="true" targetFramework="4.5" /> <httpRuntime targetFramework="4.5" /> </system.web> <connectionStrings> <add name="sql" connectionString="Data Source=.;Initial CataLog=DBLQBZ;Integrated Security=True"/> </connectionStrings> </configuration
三层代码可以参考前几篇的文章。项目文件：http://pan.baidu.com/s/1jG3aS42
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