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EventLog Constructor (String)

Initializes a new instance of the EventLog class. Associates the instance with a log on the local computer.

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

'Declaration
Public Sub New ( _
	logName As String _
)

Parameters

logName
Type: System.String

The name of the log on the local computer.

ExceptionCondition
ArgumentNullException

The log name is Nothing.

ArgumentException

The log name is invalid.

This overload sets the Log property to the logName parameter. 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. This overload of the constructor specifies the Log property, but you can change this before reading the Entries property.

If the source you specify in the Source property is unique from other sources on the computer, a subsequent call to WriteEntry creates a log with the specified name, if it does not already exist.

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

Property

Initial Value

Source

An empty string ("").

Log

The logName parameter.

MachineName

The local computer (".").

The following example reads entries in the event log, "myNewLog", on the local computer.

Option Explicit
Option Strict

Imports System
Imports System.Diagnostics
Imports System.Threading
Imports Microsoft.VisualBasic

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 

        Dim myLog As New EventLog("myNewLog")

        ' Read the event log entries. 
        Dim entry As EventLogEntry
        For Each entry In  myLog.Entries
            Console.WriteLine((ControlChars.Tab & "Entry: " & entry.Message))
        Next entry
    End Sub ' Main
End Class ' MySample

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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