Bug 28804 - Exception message for duplicate dictionary entry different to Microsoft implementation
Summary: Exception message for duplicate dictionary entry different to Microsoft imple...
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: 3.12.0
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2015-04-06 07:50 UTC by David Fowler
Modified: 2015-04-07 11:46 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and 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 Links.

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.

Related Links:

Description David Fowler 2015-04-06 07:50:02 UTC
class MainClass
    public static void Main (string[] args)
        var d = new Dictionary<string,string> ();
        d.Add ("x", "1");
        d.Add ("x", "2");

On the MS impl it says "An item with the same key has already been added" 
On mono it says "An element with the same key already exists in the dictionary"

Found by our travis ci (ASP.NET 5) https://travis-ci.org/aspnet/Configuration#L2717
Comment 1 Marek Safar 2015-04-07 11:46:34 UTC
Already fixed in Mono 4.0