Error handler RESOLVED

[Norkis]

Hey,

How to make nice error handler?
I need, that if error eccurs, user would be redirected to my designed page, which descripbes about error, where it coursed, how to contact administrator or event email me, descibbing this error.

This should work in all pages. I do not want to use "Try" in every statement.

Regards in advance

[Fishcake]

A nice way of handling errors is as follows:

in your web.config within system.web

<customErrors mode="On" defaultRedirect="errorpage.aspx" /> 

in global.asax.vb:

Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
        ' Fires when an error occurs
        Dim objError As System.Exception = Server.GetLastError
        HttpContext.Current.Application.Add("lastException", objError)
    End Sub

Design errorpage.aspx however you like. In this example the user isn't told what went wrong but admin is emailed detailed information on the error.
errorpage.aspx.vb

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here
        Dim strError As String
        Dim objError As System.Exception = HttpContext.Current.Application.Get("lastException")
        lblTitle.Text = "Application Error!"
        lblmessage.Text = "There has been an unexpected error. Administration have been informed. Please try again later."
        'now send an email to the admin
        Try
            strError &= vbNewLine
            strError &= objError.GetBaseException.Message & vbNewLine
            strError &= objError.GetBaseException.StackTrace
            strError &= vbNewLine & "Source : " & objError.GetBaseException.Source
        Catch ex As Exception
            strError = "Unable to obtain error information"
        End Try
 
        Try
            Dim ErrorUrl As String = Request.Params("aspxerrorpath").ToString
            Dim strErrormsg As String
            If User.Identity.IsAuthenticated Then
                strErrormsg = "An Error has occurred on xxx.co.uk, user ID: " & User.Identity.Name & " requested the page " & ErrorUrl & ". "
            Else
                strErrormsg = "An Error has occurred on xxx.co.uk, An unauthenticated user requested the page " & ErrorUrl & ". "
            End If
            Dim ObjMM As New MailMessage
            ObjMM.From = "[email protected]"
            ObjMM.To = "xxx.co.uk"
            ObjMM.Subject = "xxx Site Error"
            ObjMM.Body = strErrormsg
            ObjMM.Body &= vbNewLine & strError
            ObjMM.BodyFormat = MailFormat.Text
            SmtpMail.SmtpServer = "smtp.xxx.co.uk"
            SmtpMail.Send(ObjMM)
        Catch
        End Try
        FormsAuthentication.SignOut()
        Session.Abandon()
    End Sub

Hopefully thats enough to get you started.

[venerable bede]

I might not have posted the question Fishcake but cheers for the answer.

I think I'll make use of it.

[Norkis]

Thanks.

Also few question:

Why using

HttpContext.Current.Application.Add("lastException", objError)

apart session variable?


Why

FormsAuthentication.SignOut()
        Session.Abandon()

is called?

How to get which page coursed an error and what url was (I don't really know, how default.aspx?var1=blah&var2=balh is called )

[Fishcake]

1. I originally tried to use Session variables for that purpose but couldn't get it to work and so came up with this solution. Someone here will be able to explain far better than i why this is.

2. On the site that that example is from if an error occured the user was signed out and the session abandoned, so a user had to start from the start again. Totally upto you.

3.

Request.Params("aspxerrorpath")

Gives you the path the error occured on.

[Norkis]

Request.Params("aspxerrorpath")

return only path name, where error occurs.

To get all url, I put Request.RawUrl into variable and retrieved it, where I needed.

Thanks for help.
RESOLVED