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How Do I...Monitor an event log?

Event logging provides a standard, centralized way for you to have your applications record important software and hardware events. Windows supplies a standard user interface for viewing the logs (Event Log). Using the common language runtime's EventLog component, you can easily connect to existing event logs, and receive event notifications when a new entry is written to the log.

This sample illustrates how to monitor an event log for new entries. It is a small console application that can be run from a command prompt. The application takes one command line argument. The argument is the name of the log that you want to monitor.

Try running the sample as follows:

> LogMonitor.exe Application

Now run the LogWrite.exe sample and write a new entry to the application log. You will see that the LogMonitor is being notified about the new entry being written.

In its simplest form, monitoring an event log involves:
  1. Creating a new instance of an EventLog component and pointing it to a appropriate event log:

    String log;
    EventLog aLog = new EventLog();
    aLog.Log = log;

  2. Adding an event handler:

    aLog.EntryWritten += new EventLogEventHandler(OnEntryWritten);

  3. Handling the event notification in your event handler:

    public static void OnEntryWritten(Object source, EventLogEvent e) {
        Console.WriteLine("Written: " + e.Entry.Message);


VB LogMonitor.exe
View Source
[This sample can be found at C:\DevFusion.Data\legacy\quickstart.developerfusion.co.uk\QuickStart\howto\samples\Services\EventLog\LogMonitor\]

Microsoft .NET Framework SDK QuickStart Tutorials Version 2.0
Copyright � 2004 Microsoft Corporation. All rights reserved.