Notice (2018-05-24): bugzilla.xamarin.com is now in
Please join us on
Visual Studio Developer Community and in the
Mono organizations on
GitHub to continue tracking issues. Bugzilla will remain
available for reference in read-only mode. We will continue to work
on open Bugzilla bugs, copy them to the new locations
as needed for follow-up, and add the new items under Related
Our sincere thanks to everyone who has contributed on this bug
tracker over the years. Thanks also for your understanding as we
make these adjustments and improvements for the future.
Please create a new report on
Developer Community or GitHub with
your current version information, steps to reproduce, and relevant error
messages or log files if you are hitting an issue that looks similar to
this resolved bug and you do not yet see a matching new report.
See https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html :
> Drawing from secondary threads is thread-safe as long as you bracket
> drawing calls with calls to lockFocusIfCanDraw and unlockFocus
Our NSView.LockFocusIfCanDraw() method throws if you call it from a background thread. It's possible that UnlockFocus() and the drawing APIs throw too.
These should not throw because this is explicitly supported.
NSApplication.CheckForIllegalCrossThreadCalls = false;
Fixed on master 062d0026f00980fef43d6f395ced10e9d573f48b