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[ASP.NET]ASP.NET程序中常用的三十三种代码(转)2007-07-13 13:41:00

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ASP.NET程序中常用的三十三种代码   1. 打开新的窗口并传送参数:    传送参数: CODE: [Copy to clipboard] response.write("<script> window .open('* .asp x?id="+this.DropDownList1.SelectIndex+"&id1="+...+"')</script>")    接收参数: CODE: [Copy to clipboard] string a = Request.QueryString("id"); string b = Request.QueryString("id1");   2.为按钮添加对话框 CODE: [Copy to clipboard] Button1.Attributes.Add("onclick","return confirm('确认?')"); button.attributes.add("onclick","if(confirm('are you sure...?')){return true;}else{return false;}")     3.删除表格选定记录 CODE: [Copy to clipboard] int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex]; string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString()    4.删除表格记录警告 CODE: [Copy to clipboard] private void DataGrid _ItemCreated( Object sender,DataGridItemEventArgs e) {   switch(e.Item.ItemType)   {    case ListItemType.Item :    case ListItemType.AlternatingItem :    case ListItemType.EditItem:     TableCell myTableCell;     myTableCell = e.Item.Cells[14];     LinkButton myDeleteButton ;     myDeleteButton = (LinkButton)myTableCell.Controls[0];     myDeleteButton.Attributes.Add("onclick","return confirm('您是否确定要删除这条信息');");     break;    default:     break;   } }   5.点击表格行链接另一页 CODE: [Copy to clipboard] private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) {   //点击表格打开   if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)    e.Item.Attributes.Add("onclick","window.open('Default.aspx?id=" + e.Item.Cells[0]. Text + "');"); }   双击表格连接到另一页    在itemDataBind事件中 CODE: [Copy to clipboard] if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) {   string OrderItemID =e.item.cells[1].Text;   ...   e.item.Attributes.Add("ondblclick", "location.href='../ShippedGrid.aspx?id=" + OrderItemID + "'"); }   双击表格打开新一页 CODE: [Copy to clipboard] if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) {   string OrderItemID =e.item.cells[1].Text;   ...   e.item.Attributes.Add("ondblclick", "open('../ShippedGrid.aspx?id=" + OrderItemID + "')"); }   ★特别注意:【?id=】 处不能为 【?id =】    6.表格超连接列传递参数 CODE: [Copy to clipboard] <asp:HyperLinkColumn Target="_blank" headertext="ID号" DataTextField="id" NavigateUrl="aaa.aspx?id='   <%# DataBinder.Eval(Container.DataItem, "数据字段1")%>' & name='<%# DataBinder.Eval(Container.DataItem, "数据字段2")%>' />   7.表格点击改变颜色 CODE: [Copy to clipboard] if (e.Item.ItemType == ListItemType.Item ||e.Item.ItemType == ListItemType.AlternatingItem) {   e.Item.Attributes.Add("onclick","this.style.backgroundColor='#99cc00';     this.style.color='buttontext';this.style.cursor='default';"); }   写在DataGrid的_ItemDataBound里 CODE: [Copy to clipboard] if (e.Item.ItemType == ListItemType.Item ||e.Item.ItemType == ListItemType.AlternatingItem) { e.Item.Attributes.Add("onmouseover","this.style.backgroundColor='#99cc00';     this.style.color='buttontext';this.style.cursor='default';"); e.Item.Attributes.Add("onmouseout","this.style.backgroundColor='';this.style.color='';"); }   8.关于日期格式    日期格式设定 CODE: [Copy to clipboard] DataFormatString="{0:yyyy-MM-dd}"     我觉得应该在itembound事件中 CODE: [Copy to clipboard] e.items.cell["你的列"].text=DateTime.Parse(e.items.cell["你的列"].text.ToString("yyyy-MM-dd"))     9.获取错误信息并到指定页面    不要使用Response.Redirect,而应该使用Server.Transfer    e.g CODE: [Copy to clipboard] // in global.asax protected void Application_Error(Object sender, EventArgs e) { if (Server.GetLastError() is HttpUnhandledException) Server.Transfer("MyErrorPage.aspx"); //其余的非HttpUnhandledException异常交给ASP.NET自己处理就okay了 :) }   Redirect会导致post-back的产生从而丢失了错误信息,所以页面导向应该直接在服务器端执行,这样就可以在错误处理页面得到出错信息并进行相应的处理    10.清空Cookie CODE: [Copy to clipboard] Cookie.Expires=[DateTime]; Response.Cookies("UserName").Expires = 0   11.自定义异常处理 CODE: [Copy to clipboard] //自定义异常处理类 using System; using System.Diagnostics; namespace MyAppException {   /// <summary>   /// 从系统异常类ApplicationException继承的应用程序异常处理类。   /// 自动将异常内容记录到Windows NT/2000的应用程序日志   /// </summary>   public class AppException:System.ApplicationException   {    public AppException()    {     if (ApplicationConfiguration.EventLogEnabled)LogEvent("出现一个未知错误。");    }   public AppException(string message)   {    LogEvent(message);   }   public AppException(string message,Exception innerException)   {    LogEvent(message);    if (innerException != null)    {     LogEvent(innerException.Message);    }   }   //日志记录类   using System;   using System.Configuration;   using System.Diagnostics;   using System.IO;   using System.Text;   using System.Threading;   namespace MyEventLog   {    /// <summary>    /// 事件日志记录类,提供事件日志记录支持    /// <remarks>    /// 定义了4个日志记录方法 (error, warning, info, trace)    /// </remarks>    /// </summary>    public class ApplicationLog    {     /// <summary>     /// 将错误信息记录到Win2000/NT事件日志中     /// <param name="message">需要记录的文本信息</param>     /// </summary>     public static void WriteError(String message)     {      WriteLog(TraceLevel.Error, message);     }     /// <summary>     /// 将警告信息记录到Win2000/NT事件日志中     /// <param name="message">需要记录的文本信息</param>     /// </summary>     public static void WriteWarning(String message)     {      WriteLog(TraceLevel.Warning, message);       }     /// <summary>     /// 将提示信息记录到Win2000/NT事件日志中     /// <param name="message">需要记录的文本信息</param>     /// </summary>     public static void WriteInfo(String message)     {      WriteLog(TraceLevel.Info, message);     }     /// <summary>     /// 将跟踪信息记录到Win2000/NT事件日志中     /// <param name="message">需要记录的文本信息</param>     /// </summary>     public static void WriteTrace(String message)     {      WriteLog(TraceLevel.Verbose, message);     }     /// <summary>     /// 格式化记录到事件日志的文本信息格式     /// <param name="ex">需要格式化的异常对象</param>     /// <param name="catchInfo">异常信息标题字符串.</param>     /// <retvalue>     /// <para>格式后的异常信息字符串,包括异常内容和跟踪堆栈.</para>     /// </retvalue>     /// </summary>     public static String FormatException(Exception ex, String catchInfo)     {      StringBuilder strBuilder = new StringBuilder();      if (catchInfo != String.Empty)      {       strBuilder.Append(catchInfo).Append("\r\n");      }      strBuilder.Append(ex.Message).Append("\r\n").Append(ex.StackTrace);      return strBuilder.ToString();     }     /// <summary>     /// 实际事件日志写入方法     /// <param name="level">要记录信息的级别(error,warning,info,trace).</param>     /// <param name="messageText">要记录的文本.</param>     /// </summary>     private static void WriteLog(TraceLevel level, String messageText)     {      try      {       EventLogEntryType LogEntryType;       switch (level)       {        case TraceLevel.Error:         LogEntryType = EventLogEntryType.Error;         break;        case TraceLevel.Warning:         LogEntryType = EventLogEntryType.Warning;         break;        case TraceLevel.Info:         LogEntryType = EventLogEntryType.Information;         break;        case TraceLevel.Verbose:         LogEntryType = EventLogEntryType.SuccessAudit;         break;        default:         LogEntryType = EventLogEntryType.SuccessAudit;         break;       }       EventLog eventLog = new EventLog("Application", ApplicationConfiguration.EventLogMachineName, ApplicationConfiguration.EventLogSourceName );       //写入事件日志       eventLog.WriteEntry(messageText, LogEntryType);      }     catch {} //忽略任何异常    }   } //class ApplicationLog }   12.Panel 横向滚动,纵向自动扩展 CODE: [Copy to clipboard] <asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>   13.回车转换成Tab CODE: [Copy to clipboard] <script language="javascript" for="document" event="onkeydown">   if(event.keyCode==13 && event.srcElement.type!='button' && event.srcElement.type!='submit' &&     event.srcElement.type!='reset' && event.srcElement.type!=''&& event.srcElement.type!='textarea');     event.keyCode=9; </script> onkeydown="if(event.keyCode==13) event.keyCode=9"    14.DataGrid超级连接列 CODE: [Copy to clipboard] DataNavigateUrlField="字段名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}"   15.DataGrid行随鼠标变色 CODE: [Copy to clipboard] private void DGzf_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) {   if (e.Item.ItemType!=ListItemType.Header)   {    e.Item.Attributes.Add( "onmouseout","this.style.backgroundColor=\""+e.Item.Style["BACKGROUND-COLOR"]+"\"");    e.Item.Attributes.Add( "onmouseover","this.style.backgroundColor=\""+ "#EFF3F7"+"\"");   } }    16.模板列 CODE: [Copy to clipboard] <ASP:TEMPLATECOLUMN visible="False" sortexpression="demo" headertext="ID"> <ITEMTEMPLATE> <ASP:LABEL text='<%# DataBinder.Eval(Container.DataItem, "ArticleID")%>' runat="server" width="80%" id="lblColumn" /> </ITEMTEMPLATE> </ASP:TEMPLATECOLUMN> <ASP:TEMPLATECOLUMN headertext="选中"> <HEADERSTYLE wrap="False" horizontalalign="Center"></HEADERSTYLE> <ITEMTEMPLATE> <ASP:CHECKBOX id="chkExport" runat="server" /> </ITEMTEMPLATE> <EDITITEMTEMPLATE> <ASP:CHECKBOX id="chkExportON" runat="server" enabled="true" /> </EDITITEMTEMPLATE> </ASP:TEMPLATECOLUMN>     后台代码 protected void CheckAll_CheckedChanged(object sender, System.EventArgs e) {   //改变列的选定,实现全选或全不选。   CheckBox chkExport ;   if( CheckAll.Checked)   {    foreach(DataGridItem oDataGridItem in MyDataGrid.Items)    {     chkExport = (CheckBox)oDataGridItem.FindControl("chkExport");     chkExport.Checked = true;    }   }   else   {    foreach(DataGridItem oDataGridItem in MyDataGrid.Items)    {     chkExport = (CheckBox)oDataGridItem.FindControl("chkExport");     chkExport.Checked = false;    }   } }   17.数字格式化 CODE: [Copy to clipboard]    【<%#Container.DataItem("price")%>的结果是500.0000,怎样格式化为500.00?】 <%#Container.DataItem("price","{0:¥#,##0.00}")%> int i=123456; string s=i.ToString("###,###.00");     18.日期格式化    【aspx页面内:<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date")%>    显示为: 2004-8-11 19:44:28    我只想要:2004-8-11 】 CODE: [Copy to clipboard] <%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date","{0:yyyy-M-d}")%>   应该如何改?    【格式化日期】    取出来,一般是object((DateTime)objectFromDB).ToString("yyyy-MM-dd");    【日期的验证表达式】    A.以下正确的输入格式: [2004-2-29], [2004-02-29 10:29:39 pm], [2004/12/31] CODE: [Copy to clipboard] ^((\d{2}(([02468][048])|([13579][26]))[\-\/\s]?((((0?[13578])|(1[02]))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\-\/\s]?((0?[1-9])|([1-2][0-9])))))|(\d{2}(([02468][1235679])|([13579][01345789]))[\-\/\s]?((((0?[13578])|(1[02]))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\-\/\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(\s(((0?[1-9])|(1[0-2]))\:([0-5][0-9])((\s)|(\:([0-5][0-9])\s))([AM|PM|am|pm]{2,2})))?$    B.以下正确的输入格式:[0001-12-31], [9999 09 30], [2002/03/03] CODE: [Copy to clipboard] ^\d{4}[\-\/\s]?((((0[13578])|(1[02]))[\-\/\s]?(([0-2][0-9])|(3[01])))|(((0[469])|(11))[\-\/\s]?(([0-2][0-9])|(30)))|(02[\-\/\s]?[0-2][0-9]))$   【大小写转换】 CODE: [Copy to clipboard] HttpUtility.HtmlEncode(string); HttpUtility.HtmlDecode(string)     19.如何设定全局变量 CODE: [Copy to clipboard]    Global.asax中    Application_Start()事件中    添加Application[属性名] = xxx;    就是你的全局变量    20.怎样作到HyperLinkColumn生成的连接后,点击连接,打开新窗口?    HyperLinkColumn有个属性Target,将器值设置成"_blank"即可.(Target="_blank")    【ASPNETMENU】点击菜单项弹出新窗口    在你的menuData.xml文件的菜单项中加入URLTarget="_blank",如: CODE: [Copy to clipboard] <?xml version="1.0" encoding="GB2312"?> <MenuData ImagesBaseURL="images/"> <MenuGroup> <MenuItem Label="内参信息" URL="Infomation.aspx" > <MenuGroup ID="BBC"> <MenuItem Label="公告信息" URL="Infomation.aspx" URLTarget="_blank" LeftIcon="file.gif"/> <MenuItem Label="编制信息简报" URL="NewInfo.aspx" LeftIcon="file.gif" /> ......   最好将你的aspnetmenu升级到1.2版    21.读取DataGrid控件TextBox值 CODE: [Copy to clipboard] foreach(DataGrid dgi in yourDataGrid.Items) {   TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId");   tb.Text.... }   23.在DataGrid中有3个模板列包含Textbox分别为 DG_ShuLiang (数量) DG_DanJian(单价) DG_JinE(金额)分别在5.6.7列,要求在录入数量及单价的时候自动算出金额即:数量*单价=金额还要求录入时限制为 数值型.我如何用客户端脚本实现这个功能?    〖思归〗 CODE: [Copy to clipboard] <asp:TemplateColumn HeaderText="数量"> <ItemTemplate> <asp:TextBox id="ShuLiang" runat='server' Text='<%# DataBinder.Eval(Container.DataItem,"DG_ShuLiang")%>' onkeyup="javascript:DoCal()" /> <asp:RegularExpressionValidator id="revS" runat="server" ControlToValidate="ShuLiang" ErrorMessage="must be integer" ValidationExpression="^\d+$" /> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="单价"> <ItemTemplate> <asp:TextBox id="DanJian" runat='server' Text='<%# DataBinder.Eval(Container.DataItem,"DG_DanJian")%>' onkeyup="javascript:DoCal()" /> <asp:RegularExpressionValidator id="revS2" runat="server" ControlToValidate="DanJian" ErrorMessage="must be numeric" ValidationExpression="^\d+(\.\d*)?$" /> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="金额"> <ItemTemplate> <asp:TextBox id="JinE" runat='server' Text='<%# DataBinder.Eval(Container.DataItem,"DG_JinE")%>' /> </ItemTemplate> </asp:TemplateColumn><script language="javascript"> function DoCal() {   var e = event.srcElement;   var row = e.parentNode.parentNode;   var txts = row.all.tags("INPUT");   if (!txts.length || txts.length < 3)    return;   var q = txts[txts.length-3].value;   var p = txts[txts.length-2].value;   if (isNaN(q) || isNaN(p))    return;   q = parseInt(q);   p = parseFloat(p);   txts[txts.length-1].value = (q * p).toFixed(2); } </script>   24.datagrid选定比较底下的行时,为什么总是刷新一下,然后就滚动到了最上面,刚才选定的行因屏幕的关系就看不到了。 CODE: [Copy to clipboard] page_load page.smartNavigation=true   25.在Datagrid中修改数据,当点击编辑键时,数据出现在文本框中,怎么控制文本框的大小 ? CODE: [Copy to clipboard] private void DataGrid1_ItemDataBound(obj sender,DataGridItemEventArgs e) {   for(int i=0;i<e.Item.Cells.Count-1;i++)    if(e.Item.ItemType==ListItemType.EditType)    {     e.Item.Cells[i].Attributes.Add("Width", "80px")    } }    26.对话框 CODE: [Copy to clipboard] private static string ScriptBegin = "<script language=\"JavaScript\">"; private static string ScriptEnd = "</script>"; public static void ConfirmMessageBox(string PageTarget,string Content) {   string ConfirmContent="var retValue=window.confirm('"+Content+"');"+"if(retValue){window.location='"+PageTarget+"';}";   ConfirmContent=ScriptBegin + ConfirmContent + ScriptEnd;   Page ParameterPage = (Page)System.Web.HttpContext.Current.Handler;   ParameterPage.RegisterStartupScript("confirm",ConfirmContent);   //Response.Write(strScript); }   27. 将时间格式化:string aa=DateTime.Now.ToString("yyyy年MM月dd日");    1.1 取当前年月日时分秒 CODE: [Copy to clipboard] currentTime=System.DateTime.Now;    1.2 取当前年 CODE: [Copy to clipboard] int 年= DateTime.Now.Year;    1.3 取当前月 CODE: [Copy to clipboard] int 月= DateTime.Now.Month;     1.4 取当前日 CODE: [Copy to clipboard] int 日= DateTime.Now.Day;    1.5 取当前时 CODE: [Copy to clipboard] int 时= DateTime.Now.Hour;   1.6 取当前分 CODE: [Copy to clipboard] int 分= DateTime.Now.Minute;    1.7 取当前秒 CODE: [Copy to clipboard] int 秒= DateTime.Now.Second;   1.8 取当前毫秒 CODE: [Copy to clipboard] int 毫秒= DateTime.Now.Millisecond;   28.自定义分页代码:    先定义变量 : CODE: [Copy to clipboard] public static int pageCount; //总页面数 public static int curPageIndex=1; //当前页面   下一页: CODE: [Copy to clipboard] if(DataGrid1.CurrentPageIndex < (DataGrid1.PageCount - 1)) {   DataGrid1.CurrentPageIndex += 1;   curPageIndex+=1; }bind(); // DataGrid1数据绑定函数     上一页: CODE: [Copy to clipboard] if(DataGrid1.CurrentPageIndex >0) {   DataGrid1.CurrentPageIndex += 1;   curPageIndex-=1; }bind(); // DataGrid1数据绑定函数     直接页面跳转: CODE: [Copy to clipboard] int a=int.Parse(JumpPage.Value.Trim());//JumpPage.Value.Trim()为跳转值 if(a<DataGrid1.PageCount) {   this.DataGrid1.CurrentPageIndex=a; } bind();   29.DataGrid使用:    添加删除确认: CODE: [Copy to clipboard] private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) {   foreach(DataGridItem di in this.DataGrid1.Items)   {    if(di.ItemType==ListItemType.Item||di.ItemType==ListItemType.AlternatingItem)    {     ((LinkButton)di.Cells[8].Controls[0]).Attributes.Add("onclick","return confirm('确认删除此项吗?');");    }   } }   样式交替: CODE: [Copy to clipboard] ListItemType itemType = e.Item.ItemType; if (itemType == ListItemType.Item ) {   e.Item.Attributes["onmouseout"] = "javascript:this.style.backgroundColor='#FFFFFF';";   e.Item.Attributes["onmouseover"] = "javascript:this.style.backgroundColor='#d9ece1';cursor='hand';" ; } else if( itemType == ListItemType.AlternatingItem) {   e.Item.Attributes["onmouseout"] = "javascript:this.style.backgroundColor='#a0d7c4';";   e.Item.Attributes["onmouseover"] = "javascript:this.style.backgroundColor='#d9ece1';cursor='hand';" ; }   添加一个编号列: CODE: [Copy to clipboard] DataTable dt= c.ExecuteRtnTableForAccess(sqltxt); //执行sql返回的DataTable DataColumn dc=dt.Columns.Add("number",System.Type.GetType("System.String")); for(int i=0;i<dt.Rows.Count;i++) {   dt.Rows[i]["number"]=(i+1).ToString(); } DataGrid1.DataSource=dt; DataGrid1.DataBind();   DataGrid1中添加一个CheckBox,页面中添加一个全选框 CODE: [Copy to clipboard] private void CheckBox2_CheckedChanged(object sender, System.EventArgs e) {   foreach(DataGridItem thisitem in DataGrid1.Items)   {    ((CheckBox)thisitem.Cells[0].Controls[1]).Checked=CheckBox2.Checked;   } }   将当前页面中DataGrid1显示的数据全部删除 CODE: [Copy to clipboard] foreach(DataGridItem thisitem in DataGrid1.Items) {   if(((CheckBox)thisitem.Cells[0].Controls[1]).Checked)   {    string strloginid= DataGrid1.DataKeys[thisitem.ItemIndex].ToString();    Del (strloginid); //删除函数   } }    30.当文件在不同目录下,需要获取数据库连接字符串(如果连接字符串放在Web.config,然后在Global.asax中初始化)    在Application_Start中添加以下代码: CODE: [Copy to clipboard] Application["ConnStr"]=this.Context.Request.PhysicalApplicationPath+ConfigurationSettings.     AppSettings["ConnStr"].ToString();     31. 变量.ToString()    字符型转换 转为字符串 CODE: [Copy to clipboard] 12345.ToString("n"); //生成 12,345.00 12345.ToString("C"); //生成 ¥12,345.00 12345.ToString("e"); //生成 1.234500e+004 12345.ToString("f4"); //生成 12345.0000 12345.ToString("x"); //生成 3039 (16进制) 12345.ToString("p"); //生成 1,234,500.00%   32、变量.Substring(参数1,参数2);    CODE: [Copy to clipboard] 截取字串的一部分,参数1为左起始位数,参数2为截取几位。 如:string s1 = str.Substring(0,2);    33.在自己的网站上登陆其他网站:(如果你的页面是通过嵌套方式的话,因为一个页面只能有一个FORM,这时可以导向另外一个页面再提交登陆信息) CODE: [Copy to clipboard] <SCRIPT language="javascript"> <!--   function gook(pws)   {    frm.submit();   } //--> </SCRIPT> <body leftMargin="0" topMargin="0" onload="javascript:gook()" marginwidth="0" marginheight="0"> <form name="frm" action=" http://220.194.55.68:6080/login.php?retid=7259 " method="post"> <tr> <td> <input id="f_user" type="hidden" size="1" name="f_user" runat="server"> <input id="f_domain" type="hidden" size="1" name="f_domain" runat="server"> <input class="box" id="f_pass" type="hidden" size="1" name="pwshow" runat="server"> <INPUT id="lng" type="hidden" maxLength="20" size="1" value="5" name="lng"> <INPUT id="tem" type="hidden" size="1" value="2" name="tem"> </td> </tr> </form>   文本框的名称必须是你要登陆的网页上的名称,如果源码不行可以用vsniffer 看看。    下面是获取用户输入的登陆信息的代码: CODE: [Copy to clipboard] string name; name=Request.QueryString["EmailName"]; try {   int a=name.IndexOf("@",0,name.Length);   f_user.Value=name.Substring(0,a);   f_domain.Value=name.Substring(a+1,name.Length-(a+1));   f_pass.Value=Request.QueryString["Psw"]; } catch {   Script.Alert("错误的邮箱!");   Server.Transfer("index.aspx"); }

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