GridView.Items.IndexOf Result -1

[n/a]

I am trying to create a status column that shows yellow when a record update is being pushed to the server, and changes to green when the update is complete, but am having trouble.  The following is my code...

public void dg_RowLoaded(object sender, RowLoadedEventArgs e) {
            e.Row.Cells[0].Content = (dg.Items.IndexOf(e.Row.Item) + 1).ToString();
        }
        public void dg_RowEditEnded(object sender, GridViewRowEditEndedEventArgs e) {
            if (e.EditAction == GridViewEditAction.Commit) {
                e.Row.Cells[0].Background = new SolidColorBrush(Colors.Yellow);
                _ws.SetContactCompleted += new EventHandler<ServiceReference1.SetContactCompletedEventArgs>(_ws_SetContactCompleted);
                _ws.SetContactAsync((ServiceReference1.Contact)e.Row.Item);
            } else {
                dg.CancelEdit();
            }
        }
        public void _ws_SetContactCompleted(object sender, ServiceReference1.SetContactCompletedEventArgs e) {
            int iIndex = dg.Items.IndexOf(e.Result);
            DependencyObject iDO = dg.ItemContainerGenerator.ContainerFromIndex(iIndex);
        }

In dg_RowEditEnded I pass a Contact to the webservice to be updated, and after update it returns the same Contact back in e.Result in the _ws_SetContactCompleted method.  However, when I call IndexOf it returns -1.  I have checked the passed and return values from the webservice, and it is the exact same object.

Any help is much appreciated.

Thanks

[Tsvyatko]

Hi Ari Perlstein,

I have checked the code you have sent to me and prepared sample project that demonstrates how to achieve the desired behavior.

There are two major reasons that prevent your code to work correctly:

1.Using this code:
_ws.SetContactAsync((ServiceReference1.Contact)e.Row.Item)
  You had passed the old state of the object. However the state of the object has been already updated with the new value. (e.g. Editing Name from Charlie to John. Service will receive Charlie while Silverlight will keep John). This will result in difference between object in e.Result and the one kept in gridview itemsSource.

2. When you receive entity from the WCF it represent different object (has different hashcode) than the one in the silverlight application. Thus you need to provide mechanism (override equals of get hashcode) to compare these objects.

Let me know if this works for you.

Greetings,

Tsvyatko

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