'Declaration Public Event TraceEvent As MonitorEventHandler
public event MonitorEventHandler TraceEvent
Event Data
The event handler receives an argument of type MonitorEventArgs containing data related to this event. The following MonitorEventArgs properties provide information specific to this event.
Property | Description |
---|---|
CallStack | Gets the call stack of the monitor event. |
Description | Gets the description of a DbMonitor event. |
Duration | The time between the start and the end of the event. |
EventType | Gets DbMonitor event type. |
ExtraInfo | Gets the additional information for a DbMonitor event. |
TracePoint | Determines whether TraceEvent event occurs before or after the operation takes place. |
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) { MySqlConnection myConn = new MySqlConnection( "User Id=root;Host=localhost;Database=Test;"); MySqlMonitor myMonitor = new MySqlMonitor(); myMonitor.TraceEvent += new MonitorEventHandler(OnEvent); myMonitor.IsActive = true; MySqlCommand myCommand = new MySqlCommand("select count(*) from Dept",myConn); myConn.Open(); Console.WriteLine(myCommand.ExecuteScalar()); myConn.Close(); myMonitor.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 myConn As MySqlConnection = New MySqlConnection( _ "User Id=root;Host=localhost;Database=Test;") Dim myMonitor As MySqlMonitor = New MySqlMonitor AddHandler myMonitor.TraceEvent, AddressOf OnEvent myMonitor.IsActive = True Dim myCommand As MySqlCommand = New MySqlCommand("select count(*) from Dept", myConn) myConn.Open() Console.WriteLine(myCommand.ExecuteScalar()) myConn.Close() RemoveHandler myMonitor.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