Debug XBAP using WinForms Host

26. January 2009 06:13 by Mrojas in General  //  Tags: , , , , ,   //   Comments (0)

Recently I had to deal with targeting an XBAP application that had some Windows Forms controls.

The problem is that those controls can only be used in a trusted environment. If you try to debug an XBAP with some Windows Forms Controls you will get an exception like:

Message: Cannot create instance of 'Page1' defined in assembly 'XBAPWithWinForms, Version=, Culture=neutral, PublicKeyToken=null'. Exception has been thrown by the target of an invocation.  Error in markup file 'Page1.xaml' Line 1 Position 7.

It took me a while to found a solution, and it was thru Scott Landford Blog that I found a way around.

In short what he recommends to do is:

Change your settings to:

Start Action->Start external program = %windir%system32\PresentationHost.exe

  In my case (and the case of most people that is: c:\windows\system32\PresentationHost.exe)

Start Options->Command line arguments = -debug "c:\projects\myproject\bin\debug\MyProject.xbap" -debugSecurityZoneUrl "http://localhost:2022"

Copy the value from the Start URL after the –debug argument

Very import for using WinForms components you must run in FULL TRUST



Here is some XBAP code using a WinForms WebBrowser. They designer does not like it a lot but it works: