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) { ZohoConnection zohoConn = new ZohoConnection( "Refresh Token=1000.a6fde76542bfbb5244a7e539d4390e72.87e34ea57023c2d0e7dcb9ce55e3e7f3;ClientId=1000.M4FJLKYTSED90LJHUTVMKKAA432RUK;ClientSecret=89a0ed79957808814cdb20b9765423efffa767d1d0"); ZohoMonitor zohoMonitor = new ZohoMonitor(); zohoMonitor.TraceEvent += new MonitorEventHandler(OnEvent); zohoMonitor.IsActive = true; ZohoCommand zohoCommand = new ZohoCommand("select count(*) from Accounts",zohoConn); zohoConn.Open(); Console.WriteLine(zohoCommand.ExecuteScalar()); zohoConn.Close(); zohoMonitor.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)
{
  ZohoConnection zohoConn = new ZohoConnection(
      "Refresh Token=1000.a6fde76542bfbb5244a7e539d4390e72.87e34ea57023c2d0e7dcb9ce55e3e7f3;ClientId=1000.M4FJLKYTSED90LJHUTVMKKAA432RUK;ClientSecret=89a0ed79957808814cdb20b9765423efffa767d1d0");
  ZohoMonitor zohoMonitor = new ZohoMonitor();
  zohoMonitor.TraceEvent += new MonitorEventHandler(OnEvent);
  zohoMonitor.IsActive = true;
  ZohoCommand zohoCommand = new ZohoCommand("select count(*) from Accounts",zohoConn);
  zohoConn.Open();
  Console.WriteLine(zohoCommand.ExecuteScalar());
  zohoConn.Close();
  zohoMonitor.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 zohoConn As ZohoConnection = New ZohoConnection( _ "Refresh Token=1000.a6fde76542bfbb5244a7e539d4390e72.87e34ea57023c2d0e7dcb9ce55e3e7f3;ClientId=1000.M4FJLKYTSED90LJHUTVMKKAA432RUK;ClientSecret=89a0ed79957808814cdb20b9765423efffa767d1d0") Dim zohoMonitor As ZohoMonitor = New ZohoMonitor AddHandler zohoMonitor.TraceEvent, AddressOf OnEvent zohoMonitor.IsActive = True Dim zohoCommand As ZohoCommand = New ZohoCommand("select count(*) from Accounts", zohoConn) zohoConn.Open() Console.WriteLine(zohoCommand.ExecuteScalar()) zohoConn.Close() RemoveHandler zohoMonitor.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 zohoConn As ZohoConnection = New ZohoConnection( _
      "Refresh Token=1000.a6fde76542bfbb5244a7e539d4390e72.87e34ea57023c2d0e7dcb9ce55e3e7f3;ClientId=1000.M4FJLKYTSED90LJHUTVMKKAA432RUK;ClientSecret=89a0ed79957808814cdb20b9765423efffa767d1d0")
  Dim zohoMonitor As ZohoMonitor = New ZohoMonitor
  AddHandler zohoMonitor.TraceEvent, AddressOf OnEvent
  zohoMonitor.IsActive = True
  Dim zohoCommand As ZohoCommand = New ZohoCommand("select count(*) from Accounts", zohoConn)
  zohoConn.Open()
  Console.WriteLine(zohoCommand.ExecuteScalar())
  zohoConn.Close()
  RemoveHandler zohoMonitor.TraceEvent, AddressOf OnEvent
  Console.ReadLine()
End Sub

Reference

MonitorEventHandler Members
Devart.Common Namespace

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