MonitorEventHandler Delegate

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Represents the method that will handle the TraceEvent event of the DbMonitor class.

Syntax

Visual Basic
C#


'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.

csharp


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) { BigQueryConnection bigQueryConn = new BigQueryConnection( @"Authentication Type=ServiceAccount;ServiceAccount Json=C:\keys\service-account.json;Project Id=your_project;DataSet Id=your_dataset;License Key=*********"); BigQueryMonitor bigQueryMonitor = new BigQueryMonitor(); bigQueryMonitor.TraceEvent += new MonitorEventHandler(OnEvent); bigQueryMonitor.IsActive = true; BigQueryCommand bigQueryCommand = new BigQueryCommand("select count() from your_project.your_dataset.employees",bigQueryConn); bigQueryConn.Open(); Console.WriteLine(bigQueryCommand.ExecuteScalar()); bigQueryConn.Close(); bigQueryMonitor.TraceEvent -= new MonitorEventHandler(OnEvent); Console.ReadLine(); }

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)
{
  BigQueryConnection bigQueryConn = new BigQueryConnection(
      @"Authentication Type=ServiceAccount;ServiceAccount Json=C:\keys\service-account.json;Project Id=your_project;DataSet Id=your_dataset;License Key=**********");
  BigQueryMonitor bigQueryMonitor = new BigQueryMonitor();
  bigQueryMonitor.TraceEvent += new MonitorEventHandler(OnEvent);
  bigQueryMonitor.IsActive = true;
  BigQueryCommand bigQueryCommand = new BigQueryCommand("select count(*) from your_project.your_dataset.employees",bigQueryConn);
  bigQueryConn.Open();
  Console.WriteLine(bigQueryCommand.ExecuteScalar());
  bigQueryConn.Close();
  bigQueryMonitor.TraceEvent -= new MonitorEventHandler(OnEvent);
  Console.ReadLine();
}

Visual Basic


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 bigQueryConn As BigQueryConnection = New BigQueryConnection( _ "Authentication Type=ServiceAccount;ServiceAccount Json=C:\keys\service-account.json;Project Id=your_project;DataSet Id=your_dataset;License Key=*********") Dim bigQueryMonitor As BigQueryMonitor = New BigQueryMonitor AddHandler bigQueryMonitor.TraceEvent, AddressOf OnEvent bigQueryMonitor.IsActive = True Dim bigQueryCommand As BigQueryCommand = New BigQueryCommand("select count() from your_project.your_dataset.employees", bigQueryConn) bigQueryConn.Open() Console.WriteLine(bigQueryCommand.ExecuteScalar()) bigQueryConn.Close() RemoveHandler bigQueryMonitor.TraceEvent, AddressOf OnEvent Console.ReadLine() End Sub

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 bigQueryConn As BigQueryConnection = New BigQueryConnection( _
      "Authentication Type=ServiceAccount;ServiceAccount Json=C:\keys\service-account.json;Project Id=your_project;DataSet Id=your_dataset;License Key=**********")
  Dim bigQueryMonitor As BigQueryMonitor = New BigQueryMonitor
  AddHandler bigQueryMonitor.TraceEvent, AddressOf OnEvent
  bigQueryMonitor.IsActive = True
  Dim bigQueryCommand As BigQueryCommand = New BigQueryCommand("select count(*) from your_project.your_dataset.employees", bigQueryConn)
  bigQueryConn.Open()
  Console.WriteLine(bigQueryCommand.ExecuteScalar())
  bigQueryConn.Close()
  RemoveHandler bigQueryMonitor.TraceEvent, AddressOf OnEvent
  Console.ReadLine()
End Sub

Reference

MonitorEventHandler Members
Devart.Common Namespace

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