So you’re getting the most awful error Silverlight can throw… I really wish I could tell you that if you hope on one leg while reciting the alphabet in reverse order will give you a vaguely helpful error message, but I can’t. The most common causes are:

Basically if there’s anything Silverlight doesn’t like at runtime, it’ll tend to throw this error. I’ll try to help you with the last two on the list above.

Layout Issue

In the stack trace for the error, check for the tell tale references to ‘MeasureOverride’. This means you’ve probably got a layout issue. What you’ve likely got is a fixed-width element, and the children require more space than you’re providing. In my case I had a table column that was 2 pixels too narrow. If your layout allows it, try to avoid using pixel sizes even if you know the correct size since sometimes additional styling can change required sizes slightly.

Some other problem

This one is the trickiest to solve, for obvious reasons. The best way I’ve found to debug is to go completely old school and strip everything back to the bare minimum and see if your code works then. This includes removing data binding. You need to get the page to display without any errors. Once you’ve reached this point slowly start re-introducing code. Eventually the error will re-appear and you should have a much better idea of exactly where the problem is. Of course you have to solve the problem still, but at least you know roughly where it is now.

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