GridViewCollectionChangingEventArgs ?

[Thomas]

Hello,

Trying to catch the 'SortChanging' event.

My first guess is that in GridViewCollectionChangingEventArgs
.NewItems, I'm going to fing the new 'SortDescriptor', and in GridViewCollectionChangingEventArgs
.OldItems

But I see that the behavior is different from what I exepected

Initial state: the gridview is not sorted.
Action : I click on the column titles.

1° Click on columne A : First time, the grid is not sorted, in NewItems, I find one 'new item' corresponding to what expected.
 NewItems : A Ascending; [as expected]
 OldItems : null; [as expected]
2° I click on the same column again
 NewItems : A descending; [as expected]
 OldItems : A descending; [not as expected : I expected A Ascending]
3° I click on another column
 NewItems : A descending; [not as expected : I expected B something]
 OldItems : A descending; [as expected]

(NewItems and OldItems are always = 1.)

Which means that I can when changing sort, I can not distinguinshed what exactly has changed from the EventArgs.

Or am I not doing this the right way ?

Thank you for your help.



And in case here the code I'm using to test it right now:

            object o;
            SortDescriptor newSortDescriptor, oldSortDescriptor;
            string newItemString, oldItemString;

            for (int i = 0; i < e.NewItems.Count; i++)
            {
                o = e.NewItems[i];
                if(o.GetType().Equals(typeof(SortDescriptor))) {
                    newSortDescriptor = (SortDescriptor)o;
                    newItemString = newSortDescriptor.PropertyName + ' ' + newSortDescriptor.Direction;
                }
                
            }

            for (int i = 0; i < e.OldItems.Count; i++)
            {
                o = e.OldItems[i];
                if (o.GetType().Equals(typeof(SortDescriptor)))
                {
                    oldSortDescriptor = (SortDescriptor)o;
                    oldItemString = oldSortDescriptor.PropertyName + ' ' + oldSortDescriptor.Direction;
                }
            }

[Julian Benkov]

Hi Thomas,

Thank you for writing.

The NewItems / OldItems event arguments do not have correct values for the SortChaging event. I logged the issue and a fix for it will be available in one of our next releases. Despite my efforts I was not able to implement a work-around for the current situation.

Thank you for the report. Your Telerik points have been updated.

Best wishes,
Julian Benkov
the Telerik team

[Jason Parrish]

This also appears to occur for Filtering as well.

[Julian Benkov]

Hi guys,

I am glad to inform you that the issue is planned to be addressed in our upcoming Service Pack scheduled for this week.

Best wishes,

Julian Benkov
the Telerik team

[Johannes]

This issue still exists (I am using Q3 2012 SP1). The EventArgs members "OldItems" and "NewItems" sometimes do not have correct values.

What I wanted to achieve is to get a BindingSource updated when an user changes the sorting of a RadGridView on the same Form. Call it kind of "sorting synchronisation" (Direction and Property/ColumnName) between the two of them. This is what I use until the error is fixed... if so.

private void DataGrid_SortChanged(object sender, GridViewCollectionChangedEventArgs e)
{
    // ...

    SortDescriptor sortDescriptor;

 

    if (e.OldItems != null && e.OldItems[0] as SortDescriptor != null)

    {

        sortDescriptor = (SortDescriptor) e.OldItems[0];

        Debug.WriteLine("Using OldItem for Sorting: " + sortDescriptor.PropertyName + " " + sortDescriptor.Direction);

    }

    else

    {

        if (e.NewItems != null && e.NewItems[0] as SortDescriptor != null)

        {

            sortDescriptor = (SortDescriptor) e.NewItems[0];

            Debug.WriteLine("Using NewItem for Sorting: " + sortDescriptor.PropertyName + " " + sortDescriptor.Direction);

        }

    }

    if (sortDescriptor == null) return;

    var direction = (sortDescriptor.Direction == ListSortDirection.Ascending)
                    ? "ASC"
                    : "DESC";

    MyBindingSource.Sort = String.Concat(sortDescriptor.PropertyName, " ", direction);
}


[Julian Benkov]

Hello Johannes,

I have tested the RadGridView sorting operation and the SortChanging event handler and I did not find any issues with the OldItems and NewItems collection content. If you continue to experience the same issue, please send us a simple project with some part of your data to investigate the issue locally.

Thank you for your time and cooperation. 

Kind regards,
Julian Benkov
the Telerik team