Global threadexception for Windows Service?

[mrdance]

I know that you can make a global exception for an application by adding a handler like this:

AddHandler Application.ThreadException, AddressOf Application_ThreadException

But what about windows services? Can you catch global errors there?

thanks!

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[chiph]

The Application object is part of the Windows Forms namespace, and since services aren't supposed to have user interfaces, you probably shouldn't be using the ThreadException handler.

It's really a bad name -- You would think it comes from System.Threading, but it doesn't. You'll probably want to use the AppDomain.UnhandledException handler instead.

Chip H.


____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first

 

[mrdance]

I tried adding (at different places, new, start) in the service:

AddHandler AppDomain.CurrentDomain.UnhandledException, New System.UnhandledExceptionEventHandler(AddressOf ThreadException)

Here is my function:

Public Sub ThreadException(ByVal sender As Object, ByVal e As System.UnhandledExceptionEventArgs)
Dim ex As Exception = CType(e.ExceptionObject, Exception)
MsgBox(ex.ToString)
End Sub

( I use desktop interactive mode, so I should see the messagebox )

Somewhere, in the start a I call a function which does this:

Dim i As Double = CType("sdjlksfd", Double)

This makes the service start and then stop, but I don't see a messagebox with the error. I have tested so that I can see other messageboxes.

Do you have any ideas how to do this "right"?

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[chiph]

Re-read my post, especially the part about services not having user interfaces.

You'll need to write any error messages to a log file, or the event viewer.

Chip H.


____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first

 

[mrdance]

Don't know exactly what you mean, I have no problem showing a messagebox from a service (when it's running in interactive mode).

Anyway, I tried logging to a file and the eventviewer. The problem is that the exception is not fired and that's why I can't see anything in the logfile, eventviewer or as I tested before, in a messagebox.

Maybe I have missunderstood you again!

thanks!

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[chiph]

To make sure your handler is being added correctly, do something like this:

AddHandler AppDomain.CurrentDomain.UnhandledException, AddressOf ThreadException
Throw New Exception("foo")

Your handler should be called.

Chip H.


____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first