I'm developing a WPF MarkupExtension and encountered errors during design time. With the previous version of Visual Studio 2010 it was possible to start a second instance of Visual Studio 2010 and attach to the process of the already-running instance, setting breakpoints and debugging the design time behavior.
In Visual Studio 2012 however I can attach to the process of another Visual Studio 2012 as well, but no symbols are loaded in the second instance and therefor I'm not able to debug the design time as with Visual Studio 2010.
How do I get this debugger running?
Things I've tried:
The process is called XDesProc, and it is created with each new Preview Window. Therefor: to debug a preview window, open a second instance of Visual Studio 2012 with the same solution, set your breakpoints and attach to XDesProc. It's recommended to have only one preview window open to attach to the right process. Otherwise use Process Explorer to find the correct process.