

//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(" ");
}
strBuilder.Append(ex.Message).Append(" ").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
} 
本文介绍了一个自定义异常处理类AppException,该类继承自ApplicationException,并能自动将异常内容记录到Windows NT/2000的应用程序日志。此外,还详细解释了一个事件日志记录类ApplicationLog,提供了四种不同级别的日志记录方法。
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