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ASP.NET常用的三十三种实用代码

2024-07-10 13:07:41
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1. 打开新的窗口并传送参数:

  传送参数:

response.write("<script>window.open(’*.aspx?id="+this.dropdownlist1.selectindex+"&id1="+...+"’)</script>")


  接收参数:

string a = request.querystring("id");
string b = request.querystring("id1");


  2.为按钮添加对话框

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

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

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

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

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

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

<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

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

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

dataformatstring="{0:yyyy-mm-dd}"


  我觉得应该在itembound事件中

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

// 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

cookie.expires=[datetime];
response.cookies("username").expires = 0


  11.自定义异常处理

//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

<asp:panel ></asp:panel>


  13.回车转换成tab

<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

datanavigateurlfield="字段名" datanavigateurlformatstring="http://xx/inc/delete.aspx?id={0}"


  15.datagrid行随鼠标变色

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

<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

  【<%#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");

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