Leo,
In your Page_Error don't use the m_log for the Base class, but instead
lookup the logger for the actual instance type of Me.
Not being a VB head I don't know exactly the syntax for doing that, but
if I had to guess it would be:
LogManager.GetLogger(Me.GetType()).Error("An unexpected exception ...")
Cheers,
Nicko
> -----Original Message-----
> From: Hart, Leo [mailto:[EMAIL PROTECTED]
> Sent: 01 September 2005 20:13
> To: [email protected]
> Subject: Logging Exceptions Through a Base Page
>
> Hello,
>
> I suspect this will be an easy one for you experts out there,
> but I haven't been able to figure it out at this point.
>
> I have a web application utilizing Log4Net. I am trying to
> figure out the best way to capture and log unhandled
> exceptions in my app. I have two major requirements:
>
> 1: I don't want to have to write the same repetitive code in
> each new page.
> 2: I want the Logger of my log entry to contain the name of
> the Page that triggered the error.
>
>
> So here's what I did:
>
> I have a class called ReferenceWebApp.Web.BasePage that inherits
> System.Web.UI.Page:
>
> #Region " Options "
>
> Option Explicit On
> Option Strict On
>
> #End Region
>
> #Region " Imports "
>
> Imports log4net
> Imports log4net.Config
>
> Imports System.Web
> Imports System.Web.SessionState
> Imports System.IO
>
> #End Region
>
> Public Class BasePage
> Inherits System.Web.UI.Page
>
> #Region " Member Variables "
>
> Protected m_log As ILog =
> LogManager.GetLogger(GetType(BasePage))
>
> #End Region
>
> Protected Overridable Sub Page_Error(ByVal
> sender As Object, ByVal e As System.EventArgs) Handles MyBase.Error
> Me.m_log.Error("An unexpected exception has
> occurred: ", Server.GetLastError)
> Server.ClearError()
>
> Server.Transfer("/ReferenceWebApp/ExceptionPages/ExceptionUnha
> ndled.aspx
> ")
> End Sub
>
> End Class
>
> This class acts as a base page class from which all other
> pages in the application will inherit.
>
> I also have a class called
> ReferenceWebApp.Web.SimpleLoggingPage1 that inherits from my
> base class:
>
> #Region " Options "
>
> Option Explicit On
> Option Strict On
>
> #End Region
>
> #Region " Imports "
>
> Imports log4net
>
> Imports ReferenceWebApp.Data.Dtos
> Imports ReferenceWebApp.Data.Persistence.Daos
>
> #End Region
>
> Namespace LoggingUsage
>
> Public Class SimpleLoggingPage1
> Inherits BasePage
>
> #Region " Web Form Designer Generated Code "
>
> 'This call is required by the Web Form Designer.
> <System.Diagnostics.DebuggerStepThrough()>
> Private Sub InitializeComponent()
>
> End Sub
>
> 'NOTE: The following placeholder
> declaration is required by the Web Form Designer.
> 'Do not delete or move it.
> Private designerPlaceholderDeclaration
> As System.Object
>
> Private Sub Page_Init(ByVal sender As
> System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
> 'CODEGEN: This method call is
> required by the Web Form Designer
> 'Do not modify it using the code editor.
> InitializeComponent()
> End Sub
>
> #End Region
>
> Protected WithEvents
> wc_btnCauseException As Button
>
> #Region " Member Variables "
>
> Protected Shadows m_log As ILog =
> LogManager.GetLogger(GetType(SimpleLoggingPage1))
>
> #End Region
>
> Private Sub Page_Load(ByVal sender As
> System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
> Me.m_log.Info("Info log.")
>
> Me.m_log.Debug("Debug log 1.")
> Me.m_log.Debug("Debug log 2.")
> End Sub
>
> Private Sub
> wc_btnCauseException_Click(ByVal sender As System.Object,
> ByVal e As System.EventArgs) Handles wc_btnCauseException.Click
> Throw New Exception("Ack! An
> exception!")
> End Sub
>
> End Class
>
> End Namespace
>
> This works almost as I want it to. Whenever an exception
> occurs, BasePage.Page_Error gets called and a log entry is made:
>
> ERROR | 2005-09-01 14:52:44, 630 | 4244 |
> ReferenceWebApp.Web.BasePage | Page_Error | An unexpected
> exception has
> occurred:
> Exception: System.Exception
> Message: Ack! An exception!
> Source: ReferenceWebApp.Web
> at
> ReferenceWebApp.Web.LoggingUsage.SimpleLoggingPage1.wc_btnCaus
> eException
> _Click(Object sender, EventArgs e)
> at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
> at
> System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventH
> andler.Rai
> sePostBackEvent(String eventArgument)
> at
> System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
> sourceControl, String eventArgument)
> at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection
> postData)
> at System.Web.UI.Page.ProcessRequestMain()
>
> The only problem is that the logger being used is
> ReferenceWebApp.Web.BasePage and not
> ReferenceWebApp.Web.SimpleLoggingPage1. I understand WHY
> this is occuring, but I was hoping you guys might have some
> idea how to get around this. I want to be able to filter on
> page or namespace and send certain error messages to one
> person and other messages to another.
>
>
> Thanks,
> Leo Hart
>
