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page_error will not fire during a callback

Posted on 2009-07-08
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Last Modified: 2012-05-07
Hi, I'm working with visual studio 2005, visual basic .net and I'm trying to use the Page_Error method to catch unhandled exceptions in my code.  I want to catch errors during callbacks, is there something about the way callbacks are handled that prevents the Page_Error method from being called because no matter what I do I don't seem to be able to get it to fire.

The sequence of events is:

Javascript makes call to RaiseCallbackEvent
RaiseCallbackEvent calls a function with an error in it (Throw New ArgumentNullException("error"))
At this point I expect Page_Error to be raised, but the code immediately calls GetCallbackResult.

I have autoeventwireup = "false" in my page but I'm using Private Sub Page_Error(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Error.  I thought that using Handles means you don't need autoeventwireup set to true.

I've tried:
Adding the Addhandler to the Page_Load Event on my page.
Setting autoeventwireup = "true"
Changing the Handles Me.Error to MyBase.Error (I read somewhere that that would fix it)

All to no avail.  I appreciate anyone who can shed some light on this subject for me.

Edit: I've done some more testing and found that the Page_Error works just as I would expect if I'm NOT in a callback.  If I place the fake error in the page load event the Page_Error event does fire.  This makes me believe that everything is wired up correctly, I suppose I'm just not using the correct method for catching errors during a callback.  

Thanks
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Question by:Schweeneh
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Accepted Solution

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Schweeneh earned 0 total points
ID: 24814641
I did a little more research and I eventually stumbled across the solution.  The answer is in the GetCallbackEventReference function.

GetCallbackEventReference(Me, "arg", "doNothing", "", "raiseError", True)

When registering the javascript to do the callback on the page I hadn't even noticed that one of the overloads of this function includes a client side error handling function.  I'm not sure how it works but during a callback errors are routed to this function instead of the original callback function (doNothing in the case above).
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