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EventLogEntryType Enumeration

Specifies the event type of an event log entry.

Namespace: System.Diagnostics
Assembly: System (in system.dll)

public enum EventLogEntryType
public enum EventLogEntryType
public enum EventLogEntryType

 Member nameDescription
ErrorAn error event. This indicates a significant problem the user should know about; usually a loss of functionality or data. 
FailureAuditA failure audit event. This indicates a security event that occurs when an audited access attempt fails; for example, a failed attempt to open a file. 
InformationAn information event. This indicates a significant, successful operation. 
SuccessAuditA success audit event. This indicates a security event that occurs when an audited access attempt is successful; for example, logging on successfully. 
WarningA warning event. This indicates a problem that is not immediately significant, but that may signify conditions that could cause future problems. 

The type of an event log entry provides additional information for the entry. Applications set the entry type when they write the entry to the event log.

Each event must be of a single type; the event types cannot be combined for an entry. The Event Viewer uses this type to determine which icon to display in the list view of the log.

The following code example demonstrates how to use the EventLogEntryType class to add information about triggered events to a log file. In this example, a switch statement is used to determine the event type. Each case statement uses the EventLogEntryType to specify the event type, gets the message and ID, and then writes the information to the log.


// Create an event log instance.
myEventLog = new EventLog(myLog);
// Initialize source property of obtained instance.
myEventLog.Source = mySource;
switch (myIntLog)
{
    case 1:
        // Write an 'Error' entry in specified log of event log.
        myEventLog.WriteEntry(myMessage, EventLogEntryType.Error, myID);
        break;
    case 2:
        // Write a 'Warning' entry in specified log of event log.
        myEventLog.WriteEntry(myMessage, EventLogEntryType.Warning, myID);
        break;
    case 3:
        // Write an 'Information' entry in specified log of event log.
        myEventLog.WriteEntry(myMessage, EventLogEntryType.Information, myID);
        break;
    case 4:
        // Write a 'FailureAudit' entry in specified log of event log.
        myEventLog.WriteEntry(myMessage, EventLogEntryType.FailureAudit, myID);
        break;
    case 5:
        // Write a 'SuccessAudit' entry in specified log of event log.
        myEventLog.WriteEntry(myMessage, EventLogEntryType.SuccessAudit, myID);
        break;
    default:
        Console.WriteLine("Error: Failed to create an event in event log.");
        break;
}
Console.WriteLine("A new event in log '{0}' with ID '{1}' "
   + "is successfully written into event log.",
   myEventLog.Log, myID);

// Check whether source exist in event log.
if (false == EventLog.SourceExists(mySource)) {
    // Create a new source in a specified log on a system.
    EventLog.CreateEventSource(mySource, myLog);
}
// Create an event log instance.
myEventLog = new EventLog(myLog);
// Initialize source property of obtained instance.
myEventLog.set_Source(mySource);
switch (myIntLog) {
    case 1 :
        // Write an 'Error' entry in specified log of event log.
        myEventLog.WriteEntry(myMessage, 
            EventLogEntryType.Error, myID);
        break;
    case 2 :
        // Write a 'Warning' entry in specified log of event log.
        myEventLog.WriteEntry(myMessage, 
            EventLogEntryType.Warning, myID);
        break;
    case 3 :
        // Write an 'Information' entry in specified log of
        // event log.
        myEventLog.WriteEntry(myMessage,
            EventLogEntryType.Information, myID);
        break;
    case 4 :
        // Write a 'FailureAudit' entry in specified log of 
        // event log.
        myEventLog.WriteEntry(myMessage, 
            EventLogEntryType.FailureAudit, myID);
        break;
    case 5 :
        // Write a 'SuccessAudit' entry in specified 
        // log of event log.
        myEventLog.WriteEntry(myMessage,
            EventLogEntryType.SuccessAudit, myID);
        break;
    default :
        Console.WriteLine("Error: Failed to create an event "
            + "in event log.");
        break;
}
Console.WriteLine("A new event in log '{0}' with ID '{1}' " 
    + "is successfully written into event log.",
    myEventLog.get_Log(),(Int32) myID);

Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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