asp.net 编程 实用语句(6条)

  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;

  }

  }

  }