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)

Public Sub New

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.

System_CAPS_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.

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

EventLogPermission

for writing the event log information on the computer. Associated enumeration: EventLogPermissionAccess.Write

.NET Framework
Available since 1.1
Return to top
Show: