Solved

Tabbing Error in Silverlight

Posted on 2013-10-23
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Last Modified: 2013-12-28
I am not familiar at all with Silverlight but have to fix an issue with a program that if a user clicks on a particular tab on the screen they get the following error:

Line: 58
Error: Unhandled Error in Silverlight Application
Code: 4004
Category: ManagedRuntimeError
Message: System.NullReferenceException: Object reference not set to an instance of an object.
   at xx.URP.Presentation.Silverlight.URPServices.Actions.MonitorResult.Equals(Object obj)
   at System.Windows.Controls.ContentControl.OnContentChanged(IntPtr nativeTarget, CValue& oldContentValue, CValue& newContentValue)

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The code does not break within Visual Studio during this error. Instead I get a window in IE that shows me this error. Anyone have any ideas as to what the problem could be? Browser is IE8, using VS 2010 and Silverlight 3.
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Question by:mathew_s
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5 Comments
 
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Expert Comment

by:apeter
ID: 39596653
Looks like you are trying to access an object which is not been instantiated. Can you please  place the oncontentchanged method code
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Author Comment

by:mathew_s
ID: 39597278
I was able to debug the code by attaching the debugger. It seems to crash at the point that I have attached. It goes to Application_UnhandledException after the return. Do you know what needs to be changed?
Snaptshot.jpg
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Author Comment

by:mathew_s
ID: 39615667
Searched the entire solution for an oncontentchanged, nothing came up. I think it is a built in method from the framework.
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Accepted Solution

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mathew_s earned 0 total points
ID: 39736768
Problem ended up being the Silverlight version.
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Author Closing Comment

by:mathew_s
ID: 39743318
The Silverlight version being used in IE ended up being the issue.
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