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Devart.Common Namespace / MonitorEventHandler Delegate
The source of the event.
The MonitorEventArgs object that contains the event data.
ExampleExample

In This Topic
    MonitorEventHandler Delegate
    In This Topic
    Represents the method that will handle the TraceEvent event of the DbMonitor class.
    Syntax
    'Declaration
     
    Public Delegate Sub MonitorEventHandler( _
       ByVal sender As Object, _
       ByVal e As MonitorEventArgs _
    ) 
    public delegate void MonitorEventHandler( 
       object sender,
       MonitorEventArgs e
    )

    Parameters

    sender
    The source of the event.
    e
    The MonitorEventArgs object that contains the event data.
    Remarks
    When you create a MonitorEventArgs delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see "Events and Delegates" in the .NET Framework SDK documentation.
    Example
    The following sample shows how to enable and disable monitoring of database activity in your application.
    static void OnEvent(object sender, MonitorEventArgs e)
    {
      if (e.TracePoint==MonitorTracePoint.BeforeEvent)
      {
        Console.WriteLine("Description: " + e.Description);
        Console.WriteLine(" Extra info: " + e.ExtraInfo);
      }
    }
    
    
    [MTAThread]
    static void Main(string[] args)
    {
      SQLiteConnection sqConn = new SQLiteConnection(
          "DataSource=mydatabase.db;");
      SQLiteMonitor sqMonitor = new SQLiteMonitor();
      sqMonitor.TraceEvent += new MonitorEventHandler(OnEvent);
      sqMonitor.IsActive = true;
      SQLiteCommand sqCommand = new SQLiteCommand("select count(*) from Dept",sqConn);
      sqConn.Open();
      Console.WriteLine(sqCommand.ExecuteScalar());
      sqConn.Close();
      sqMonitor.TraceEvent -= new MonitorEventHandler(OnEvent);
      Console.ReadLine();
    }
    Sub OnEvent(ByVal sender As Object, ByVal e As MonitorEventArgs)
      If e.TracePoint = MonitorTracePoint.BeforeEvent Then
        Console.WriteLine("Description: " & e.Description)
        Console.WriteLine(" Extra info: " & e.ExtraInfo)
      End If
    End Sub
    
    <MTAThread()> _
    Sub Main()
      Dim sqConn As SQLiteConnection = New SQLiteConnection( _
          "DataSource=mydatabase.db;")
      Dim sqMonitor As SQLiteMonitor = New SQLiteMonitor
      AddHandler sqMonitor.TraceEvent, AddressOf OnEvent
      sqMonitor.IsActive = True
      Dim sqCommand As SQLiteCommand = New SQLiteCommand("select count(*) from Dept", sqConn)
      sqConn.Open()
      Console.WriteLine(sqCommand.ExecuteScalar())
      sqConn.Close()
      RemoveHandler sqMonitor.TraceEvent, AddressOf OnEvent
      Console.ReadLine()
    End Sub
    Requirements

    Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also