EventLog WriteEntry does not write to designated l

问题:

I have an application where I want to write entries to event log The logger is instantiated through MEF. I created a derived class, to be able to perform the log initializations prior of using it.

My code is as below:

public class WinEventLog : EventLog, ILogger
{
    private const string LOG_SourceName = "DataGen_Source";
    private const string LOG_SysLogName = "Pool_Log";

    private bool _isInitialized = false;

    public WinEventLog()
        : base()
    {
        Initialize();
    }

    public void LogMessage(MessageLevel level, string message)
    {
        WriteEntry(message, level.EventLogType());
    }

    public void LogMessage(string source, MessageLevel level, string message)
    {
        WriteEntry(source, message, level.EventLogType());
    }

    public void Initialize()
    {
        if (!_isInitialized)
        {
            this.BeginInit();
            this.EndInit();

            if (!System.Diagnostics.EventLog.SourceExists(LOG_SourceName))
            {
                System.Diagnostics.EventLog.CreateEventSource(
                    LOG_SourceName, LOG_SysLogName);
            }
            Source = LOG_SourceName;
            Log = LOG_SysLogName;
            _isInitialized = true;
        }
    }
} 

However, the logger does not write into the log I specify, Pool_Log, but in Applications log.

Any idea why this happens?

---

EDIT

I referenced EXACT the same component from other project, and in this situation it wrote to the correct EventLog !!!

I'm puzzled!

Thanks

回答1:

it appears that you are creating the source but not creating the actual Log for example I would do something like the following if I wanted to create a SQLEventLog

public bool CreateLog(string strLogName)
{
    bool Result = false;

    try
    {
            System.Diagnostics.EventLog.CreateEventSource(strLogName, strLogName);
            System.Diagnostics.EventLog SQLEventLog = 
            new System.Diagnostics.EventLog();

            SQLEventLog.Source = strLogName;
            SQLEventLog.Log = strLogName;

            SQLEventLog.Source = strLogName;
            SQLEventLog.WriteEntry("The " + strLogName + " was successfully 
        initialize component.", EventLogEntryType.Information);

            Result = true;
    }
    catch
    {
        Result = false;
    }

    return Result;
}

let me know if this helps.. looks like you are missing the EventLog Creation

回答2:

you can try the following :

evntSource = "MySource";

evntLog = "MyLog"; //This replace Application!
evntEvent = "My Event";
if (!EventLog.SourceExists(evntSource))
    EventLog.CreateEventSource(evntSource,evntLog); 

EventLog.WriteEntry(evntSource,evntEvent);

回答3:

Your error may be related to permissions. Check the permissions on the registry keys of the event source.

Lastly, you shouldn't use WriteEntry, you will get a Security Exception, and other issues.

In my opinion you should use WriteEvent instead see: https://security.stackexchange.com/q/15857/396

回答4:

check if Event Log Source is not long and does not contain special meaningful characters such as .\ or ./

In my case this was the cause event was going to Application Log instead of designated custom log.

public static void EventLogWrite(string Source, string Message, short categoryID, int eventID, EventLogEntryType entryType)
{
#if !DEBUG
  if (!EventLog.SourceExists(Source))
    EventLog.CreateEventSource(Source.RefineText(), "My Log Name");

  EventLog.WriteEntry(Source.RefineText(), Message.TrimText(3000), entryType, eventID, categoryID);
#endif
}