Filters in a RadGridView get cleared at some point automatically?

[Vladimir]

We have this sort of filter

        private CompositeFilterDescriptor _deletedNewFilterDescriptor = new CompositeFilterDescriptor()
        {
            LogicalOperator = FilterCompositionLogicalOperator.Or,
            FilterDescriptors =
                    {
                        new FilterDescriptor("Column1", FilterOperator.IsNotEqualTo, "MyState"),
                        new FilterDescriptor("Column2", FilterOperator.IsNotEqualTo, "YourState")
                    }
        };

and at some point when we refresh the grid, the rows that should be filtered get displayed. So we have to do something like this which also fails on occasions

 

        void grd_loaded(object sender, RoutedEventArgs e)
        {
            // For some reason, adding filters in constructors gets cleared somewhere, so add in Loaded methods.
            if (!grd.FilterDescriptors.Contains(_deletedNewFilterDescriptor))
                grd.FilterDescriptors.Add(_deletedNewFilterDescriptor);
        }

 

Any help would be appreciated. Because we will have to filter those rows at the SQL fetching time and not afterwards. This means changing the existing code.

[Vladimir]

I forgot to add this as well

        private void Grd_OnDataLoaded(object sender, EventArgs e)
        {
            // For some reason, adding filters in constructors gets cleared somewhere, so add in Loaded methods.
            Dispatcher.InvokeDelayedAction(DispatcherPriority.Background,
                () => {
                    try
                    {
                        if (!grd.FilterDescriptors.Contains(_deletedNewFilterDescriptor))
                            grd.FilterDescriptors.Add(_deletedNewFilterDescriptor);
                    }
                    catch { } // Background thread; can't really do much if there's an error.
                });
        }

[Dilyan Traykov]

Hello Vladimir,

Thank you for the provided code snippets.

From your second reply, I see that you may be handling the DataLoaded event instead of the Loaded event of the control. Can you please specify whether this is intentional as the DataLoaded event will be fired on each data operation such as filtering, grouping, and sorting and I do not believe that adding the filter descriptor on each data operation would be desired.

Can you please also clarify what you mean by "fails on occasions" - is an exception or error observed or is it simply that the filters get cleared? Please also specify the occasions on which this happens.

If possible, it would be most helpful if you could isolate this undesired behavior in a small sample project so that I can investigate further and try to suggest a possible solution. Please let me know whether you would find this possible.

Regards,
Dilyan Traykov
Progress Telerik