MonitorEventHandler Delegate

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

[Visual Basic]
Public Delegate Sub MonitorEventHandler( _
   ByVal sender As Object, _
   ByVal e As MonitorEventArgs _
)

[C#]
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.

[C#]

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) 
{ 
  OracleConnection myConn = new OracleConnection( 
      "User Id=Scott;Password=tiger;Data Source=Ora"); 
  OracleMonitor myMonitor = new OracleMonitor(); 
  myMonitor.TraceEvent += new MonitorEventHandler(OnEvent); 
  myMonitor.IsActive = true; 
  OracleCommand myCommand = new OracleCommand("select count(*) from Test.Dept",myConn); 
  myConn.Open(); 
  Console.WriteLine(myCommand.ExecuteScalar()); 
  myConn.Close(); 
  myMonitor.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 myConn As OracleConnection = New OracleConnection( _
       "User Id=Scott;Password=tiger;Data Source=Ora")
   Dim myMonitor As OracleMonitor = New OracleMonitor
   AddHandler myMonitor.TraceEvent, AddressOf OnEvent
   myMonitor.IsActive = True
   Dim myCommand As OracleCommand = New OracleCommand("select count(*) from Test.Dept", myConn)
   myConn.Open()
   Console.WriteLine(myCommand.ExecuteScalar())
   myConn.Close()
   RemoveHandler myMonitor.TraceEvent, AddressOf OnEvent
   Console.ReadLine()
 End Sub

See Also

Language

MonitorEventHandler Delegate

Parameters

Remarks

Example

See Also