Bug 24053 - TreeSortableAdapter NullReferencePointer exception
Summary: TreeSortableAdapter NullReferencePointer exception
Status: NEW
Alias: None
Product: Gtk#
Classification: Mono
Component: gtk-sharp ()
Version: 2.x
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2014-10-25 08:32 UTC by Martin Kupec
Modified: 2014-10-25 08:32 UTC (History)
1 user (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 for Bug 24053 on GitHub or Developer Community if you have new information to add and do not yet see a matching new report.

If the latest results still closely match this report, you can use the original description:

  • Export the original title and description: GitHub Markdown or Developer Community HTML
  • Copy the title and description into the new report. Adjust them to be up-to-date if needed.
  • Add your new information.

In special cases on GitHub you might also want the comments: GitHub Markdown with public comments

Related Links:

Description Martin Kupec 2014-10-25 08:32:29 UTC
There is and problem in TreeSortableAdapter causing NullReferencePointer exception when used.

The problem is, that GTK call gtk_tree_sortable_get_sort_column_id function with NULL as order parameter.
It can be found here https://github.com/GNOME/gtk/blob/2b1cad0289b17183b6c5f10e64c5a8ddb92709c3/gtk/gtktreeviewcolumn.c:958

The GTK-Sharp generated code for TreeSortableAdapter looks like:
static bool GetSortColumnIdCallback (IntPtr sortable, out int sort_column_id, out int order)
     try {
           Gtk.TreeSortableImplementor __obj = GLib.Object.GetObject (sortable, false) as Gtk.TreeSortableImplementor;
           Gtk.SortType myorder;
           bool __result = __obj.GetSortColumnId (out sort_column_id, out myorder);
           order = (int) myorder;
           return __result;
     } catch (Exception e) {
          GLib.ExceptionManager.RaiseUnhandledException (e, true);
          // NOTREACHED: above call does not return.
          throw e;

The problem is the line "order = (int)myorder" as the function is called with "order = null".

This gtk function is called when adding TreeColumn to TreeView, so the TreeSortableAdapter as is now is probably useless.