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
GitHub or Developer Community 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.
Created attachment 23798 [details]
Run attached test case:
Mono 5.0: 500ms
Mono 2.6: 1ms
This happens because delegates have the same hash code as their delegate type:
public override int GetHashCode ()
/* same implementation as CoreCLR */
return GetType ().GetHashCode ();
So all the delegates end up in the same hash bucket. A workaround is to use a custom comparer which can provide its own hashcode.
Fixed in mono master a48bc439850869e565833d7fe6330c289beffe40.