Observable Collections and SelectionChangeEventArgs

[Jonathan]

I have a list of zipcode objects that I bind to a datagridview based on a selection from a treeview, the treeview is unimportant other than only a subset of available zipcodes are bound to the grid at any one time.

GridSelectedZipCodes.ItemsSource = ZipGeoCodeService.GetForZipPart((string)item.Header, (float)_selectedDealer.Latitude, (float)_selectedDealer.Longitude, (float)_selectedDealer.MaxDistance);

where GetForZipPart has a function signature of:

static public List<ZipGeoCode> GetForZipPart(string zippart, float latitude, float longitude, float distance)

I want to select items in the gridview based upon another list of ZipGeoCode objects that correspond to a dealer.  The dealer list may contain zipcodes from other zipparts that are not bound to the grid.  I do the selection like so:

private void SelectZipCodes()
{
    IsLoading = true;
    foreach (ZipGeoCode _item in GridSelectedZipCodes.Items)
    {
        if (_dealerZipCodes.Find(delegate(ZipGeoCode zgc) {return zgc.ID == _item.ID; }) != null)
        {
            GridSelectedZipCodes.SelectedItems.Add(_item);
        }
    }
    IsLoading = false;
}

so far so good, however now when an item is selected or deselected in the radgridview I want to add or remove it from the _dealerZipCodes in the most efficient manner.  I suspect i shoudl use the radgrdiview_selectionchanged event.  I am wondering if ther is a way to do this with observable collections?.  Any suggestions greatly appreciated and info how I can act only on the item(s) that were selected/deselected by accessing the

SelectionChangeEventArgs

would be great.

I'm not using MVVM.

Currently my radgrdiview_selectionchanged looks like the following:

private void GridSelectedZipCodes_SelectionChanged(object sender, SelectionChangeEventArgs e)
       {
           if (!(IsLoading))
           {
               //remove all items
               foreach (ZipGeoCode _item in GridSelectedZipCodes.Items)
               {
                   if (_dealerZipCodes.Find(delegate(ZipGeoCode zgc) { return zgc.ID == _item.ID; }) != null)
                   {
                       _dealerZipCodes.Remove(_item);
                   }
               }
               foreach (ZipGeoCode _item in GridSelectedZipCodes.SelectedItems)
               {
                   _dealerZipCodes.Add(_item);
               }
           }
       }

Not very efficient.

Thanks for the help/direction.

For a visual of what I'm doing: http://www.metamorpho-sys.com/telerik/Capture.GIF

Jonathan

[Maya]

Hello Jonathan,

I would suggest to bind the tree list view - DealerZipCodes - directly to the SelectedItems of RadGridView. Please take a look at this blog post for a reference on a similar scenario. Does it correspond to your requirements ? 
 

Greetings,
Maya
the Telerik team