topic Re: Changing Selection Thread issue in ArcGIS Pro SDK Questions

Changing Selection Thread issue

BrianBulla — Fri, 14 Aug 2020 15:45:32 GMT

Hi,

So in my application the user selects multiple sewer lines to start. I then have a dockpanel that gets regfreshed to show the ID of the users selection in a listbox. Now what I want is that when the user selects the ID of one of the lines in the dockpanel, that the selection in the map changes to show only that line as selected. I am doing all of my coding for this in the _SelectionChanged event of the list, but running into a "The calling thread cannot access this object because a different thread owns it." error.

What can I do to get around this??

After clicking on one of the ID's in the listbox below is when the error comes up.

Thanks,

Re: Changing Selection Thread issue

Wolf — Sun, 12 Dec 2021 09:31:50 GMT

Hi Brian,

I think using the ListBox on a different thread might be causing this issue. To work around this i would try:

      var whereClause = $@"FACILITYID = '{lstFacIDs.SelectedItem}'";
      QueuedTask.Run(() =>
      {
        QueryFilter qf = new QueryFilter()
        {
          WhereClause = whereClause
        };
        gsFLayer.Select(null, SelectionCombinationMethod.Add);
      });‍‍‍‍‍‍‍‍‍

Also note that when you call gsFLayer.ClearSelection() that this (depending on your implementation) can cause a change in your listbox content.

Re: Changing Selection Thread issue

BrianBulla — Fri, 14 Aug 2020 16:48:34 GMT

Nice! Very helpful.

Thanks!