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Silverlight 4 Out-Of-Browser: the application displays a blank (white) screen, does not throw any exceptions, does not hit breakpoints

I am having problems with Silverlight 4 Out-Of-Browser as indicated in the header.

What I've done:
Update your project settings to enable Out-Of-Browser. This included OOB, but when I ran the application this way, it just displayed a white screen.

What I did to fix this:

  • All links to System.Windows.Browser.HtmlPage (to avoid interacting with the DOM) have been removed according to various sources, including this SO question and this blog post .
  • Remove any links to SizeChangedEventHandler according to this SO question .
  • Clean up projects / solution, including ideas such as deleting * .suo files on this blog post
  • Uninstall the installed OOB application, reinstall

AND

  • As kobruleht commented here , trying to connect a debugger does not work. Visual Studio (2010, SP1) reports that it is attached without my help, but breakpoints do not hit.

So:

Can anyone advise other courses? At least I would like to go through and hit the breakpoints (or even break the Exceptions!)

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1 answer

OK, I have permission.

In AppManifest.xml I specified the assembly to load, one of which did not load correctly, which meant that App.xaml.cs->App() never reached. The problem is difficult to diagnose because the program runs without errors or exceptions, but then displays a white screen - quite misleading.

For those who are experiencing the same problem, the easiest debugging steps in this case are to launch the application in browser mode, copy the results from the Output window, and then compare the results in the Output window when you try to work in OOB mode. Any discrepancies will give a good hint of the problem.

It should also be mentioned that I had no problems with SizeChangedEventHandler , as mentioned above.

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Source: https://habr.com/ru/post/1390498/

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