Service timer : Windows Service « Windows « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows
3. Windows Service

Imports System.Diagnostics
Imports System.ServiceProcess
Imports System.Timers
Imports System.IO

Public Class Service1
    Inherits System.ServiceProcess.ServiceBase

#Region " Component Designer generated code "

    Public Sub New()
        MyBase.New()

        ' This call is required by the Component Designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call

    End Sub

    'UserService overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    ' The main entry point for the process
    <MTAThread()> _
    Shared Sub Main()
        Dim ServicesToRun() As System.ServiceProcess.ServiceBase

        ' More than one NT Service may run within the same process. To add
        ' another service to this process, change the following line to
        ' create a second service object. For example,
        '
        '   ServicesToRun = New System.ServiceProcess.ServiceBase () {New Service1, New MySecondUserService}
        '
        ServicesToRun = New System.ServiceProcess.ServiceBase () {New Service1}

        System.ServiceProcess.ServiceBase.Run(ServicesToRun)
    End Sub

    'Required by the Component Designer
    Private components As System.ComponentModel.IContainer

    ' NOTE: The following procedure is required by the Component Designer
    ' It can be modified using the Component Designer.  
    ' Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        '
        'Service1
        '
        Me.CanPauseAndContinue = True
        Me.CanShutdown = True
        Me.ServiceName = "ServiceTimer"

    End Sub

#End Region

    Private WithEvents Alarm As Timer = New Timer(300000) ' 5 minutes

    Public Sub OnTimedEvent(ByVal source As Object, ByVal e As ElapsedEventArgs) Handles Alarm.Elapsed
        Dim DirInfo As DirectoryInfo = New DirectoryInfo("C:\")

        Dim Log As New EventLog("Application")
        Log.Source = "ServiceTimer"
        Log.WriteEntry("Root files at " & Now() & " is " & _
                 DirInfo.GetFiles("*.*").Length())
        Log.Close()
    End Sub


    Protected Overrides Sub OnStart(ByVal args() As String)
        Alarm.Enabled = True

        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service started at " & DateTime.Now)
            Log.Close()
        Catch E As Exception

        End Try
    End Sub

    Protected Shadows Sub OnPause(ByVal args() As String)
        Alarm.Enabled = False

        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service paused at " & DateTime.Now)
            Log.Close()
        Catch E As Exception

        End Try
    End Sub

    Protected Shadows Sub OnContinue(ByVal args() As String)
        Alarm.Enabled = True

        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service continued at " & DateTime.Now)
            Log.Close()
        Catch E As Exception

        End Try
    End Sub

    Protected Shadows Sub OnShutdown(ByVal args() As String)
        Alarm.Enabled = False

        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service shutdown at " & DateTime.Now)
            Log.Close()
        Catch E As Exception

        End Try
    End Sub

    Protected Overrides Sub OnStop()
        Alarm.Enabled = False

        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service stopped at " & DateTime.Now)
            Log.Close()
        Catch E As Exception

        End Try
    End Sub

End Class