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asp.net 编程 实用语句(6条)

程序员文章站 2024-03-31 20:04:22
1.panel 横向滚动,纵向自动扩展 <asp:panel style="overflow-x:scroll;overflow-y:auto;"></...

1.panel 横向滚动,纵向自动扩展
<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>
2.回车转换成tab
(1)
<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>
(2) //当在有keydown事件的控件上敲回车时,变为tab
public void tab(system.web .ui.webcontrols .webcontrol webcontrol)
{
webcontrol.attributes .add ("onkeydown", "if(event.keycode==13) event.keycode=9");
}
3.datagrid超级连接列
datanavigateurlfield="字段名" datanavigateurlformatstring="http://xx/inc/delete.aspx?id={0}"
4.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
}
5.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"+"\"");
  }
}
6.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" horiz></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;
  }
  }
}