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EventLog Constructor

Initializes a new instance of the EventLog class. Does not associate the instance with any log.

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

'Declaration
Public Sub New
'Usage
Dim instance As New EventLog()

Before calling WriteEntry, specify the Source property of the EventLog instance. If you are only reading Entries from the log, you can alternatively specify only the Log and MachineName properties.

NoteNote:

If you do not specify a MachineName, the local computer (".") is assumed.

The following table shows initial property values for an instance of EventLog.

Property

Initial Value

Source

An empty string ("").

Log

An empty string ("").

MachineName

The local computer (".").

The following example creates the source MySource if it does not already exist, and writes an entry to the event log MyNewLog.

NoteNote:

Starting with Windows Vista, you must run this application as an administrator.

Option Explicit
Option Strict

Imports System
Imports System.Diagnostics
Imports System.Threading

Class MySample
    Public Shared Sub Main()

        If Not EventLog.SourceExists("MySource") Then 
            ' Create the source, if it does not already exist. 
            ' An event log source should not be created and immediately used. 
            ' There is a latency time to enable the source, it should be created 
            ' prior to executing the application that uses the source. 
            ' Execute this sample a second time to use the new source.
            EventLog.CreateEventSource("MySource", "MyNewLog")
            Console.WriteLine("CreatingEventSource")
            'The source is created.  Exit the application to allow it to be registered. 
            Return 
        End If 

        ' Create an EventLog instance and assign its source. 
        Dim myLog As New EventLog()
        myLog.Source = "MySource" 

        ' Write an informational entry to the event log.    
        myLog.WriteEntry("Writing to event log.")
    End Sub 'Main 
End Class 'MySample

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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