程序的学习是一个循序渐进的过程，一些常用的或经典代码应该保存下来以便日后使用。本文就给出一些.net的经典代码，希望对大家有所帮助……
21.自定义异常处理
//自定义异常处理类
using System;
using System.Diagnostics;
namespace MyAppException
{
///
/// 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
///
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
{
///
/// 事件日志记录类，提供事件日志记录支持
///
/// 定义了4个日志记录方法 (error, warning, info, trace)
///
///
public class ApplicationLog
{
///
/// 将错误信息记录到Win2000/NT事件日志中
/// 需要记录的文本信息
///
public static void WriteError(String message)
{
WriteLog(TraceLevel.Error, message);
}
///
/// 将警告信息记录到Win2000/NT事件日志中
/// 需要记录的文本信息
///
public static void WriteWarning(String message)
{
WriteLog(TraceLevel.Warning, message);
}
///
/// 将提示信息记录到Win2000/NT事件日志中
/// 需要记录的文本信息
///
public static void WriteInfo(String message)
{
WriteLog(TraceLevel.Info, message);
}
///
/// 将跟踪信息记录到Win2000/NT事件日志中
/// 需要记录的文本信息
///
public static void WriteTrace(String message)
{
WriteLog(TraceLevel.Verbose, message);
}
///
/// 格式化记录到事件日志的文本信息格式
/// 需要格式化的异常对象
/// 异常信息标题字符串.
///
/// 格式后的异常信息字符串，包括异常内容和跟踪堆栈.
///
///
public static String FormatException(Exception ex, String catchInfo)
{
StringBuilder strBuilder = new StringBuilder();
if (catchInfo != String.Empty)
{
strBuilder.Append(catchInfo).Append(" ");
}
strBuilder.Append(ex.Message).Append(" ").Append(ex.StackTrace);
return strBuilder.ToString();
}
///
/// 实际事件日志写入方法
/// 要记录信息的级别(error,warning,info,trace).
/// 要记录的文本.
///
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
}
22.Panel 横向滚动，纵向自动扩展
＜asp:panel style="overflow-x:scroll;overflow-y:auto;"＞＜/asp:panel＞
23.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");
}
24.DataGrid超级连接列
DataNavigateUrlField="字段名" DataNavigateUrlFormatString=http://xx/inc/delete.aspx?ID={0}
25.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"+""");
}
}