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Breakpoints not loaded in F# code
f#parsing

I'm working on a project in which we use Silverlight and some Composite framework. I'm writing F# library for this project which is responsible for parsing source code (our project will be web-based IDE) so I'm using some Powerpack stuff for parsing and lexing (and all runs in Silverlight).

Some time ago I came across a weird problem when breakpoints I set in my F# code aren't loaded in Visual Studio 2008. When I debug the application in source code there's just that empty circle with message "The breakpoint will not currently be hit. No symbols were loaded for this document". And sometimes this works just fine. I wasn't able to find out when this problem happens, for me it's just magic, sometimes I start VS and it all works.
Breakpoints in other libraries (written in C#) in our project are work correctly.

I'm not sure whether the problem is caused by F#, the combination of technologies we use or some other thing. I just installed new may F# CTP (1.9.6.16), but that didn't help.
Any suggestions?

.

When this happens, like the error says it typically means "no symbols were loaded for this document". For breakpoints to work, the source code must match the built EXE/DLL and PDB in the running process. This can fail if

  • you've made an edit to the source code since you've built
  • the EXE/DLL in the process you're debugging is not the same version as the one corresponding to the code (e.g. stale copy from a prior build)
  • the PDB is not getting deployed alongside the EXE/DLL (or there is a stale copy there)

Often the best way to rectify this is to completely delete all copies of Foo.exe/Foo.dll/Foo.pdb on the box (check if any are in the GAC, too), rebuild (and deploy), and then reattach the debugger. That said, it's possible there's something wrong in the product tooling, but most of the time this should solve it.

By on 5/23/2009 10:26 AM ()

I deleted all bin/obj folders, tried to clear VS cache and the breakpoints still don't work. I use VS integrated web server, so my deployment process reduces to pressing F5. I also use automaticly generated test page for SL.
However I discovered, that I'm not able to hit breakpoint not just in our project, but also in simple SL app with one F# dll.
And the problem with breakpoints occurs also on machines of my team mates, so it's not just corrupted installation (i tried it also on clean installation of win xp).

By on 5/26/2009 11:51 AM ()

Hi jaruch,

this is a known problem in our Silverlight support. Unfortunately there is no workaround. We hope to fix it in our next release.

By on 5/26/2009 8:44 PM ()

Bad news for me...
When will the next release be out?
Or is there any chance that some hotfix will be available soon? Becasue this problem makes SL development in F# very painful.

By on 5/28/2009 3:45 AM ()

Hm... that silence means no?
Is this problem also in VS 2010? If it's worth switching...

By on 6/6/2009 11:46 AM ()

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