I have a grid that I'm using autofilters on and am trying to detect when the user changes the filter selections.  I've dug around, but can't seem to find any event that tells me when the filters have changed.  Is there any way to detect when the filters have changed?

Hi Eric,

  there is not such an event in the DataGridCollectionView. I will fill a feature request for this.

 A workaround would be to register to every DataGridCollectionView.AutoFilterValues CollectionChanged as follow:

 IDictionary<string, IList> gridFilters = dataGridCollectionView.AutoFilterValues;

foreach( IList autofilterValues in gridFilters.Values )

{

  INotifyCollectionChanged notifyCollectionChanged = autofilterValues as INotifyCollectionChanged;

  notifyCollectionChanged.CollectionChanged += new NotifyCollectionChangedEventHandler( AutoFilterValues_CollectionChanged );

}

I ended up hooking into the Filter event on the DataGridCollectionViewSource to do what I needed.  That event seems to fire even when the user selects filters.

        /// <summary>
        /// FiltersChanged delegate
        /// </summary>
        public delegate void FiltersChangedHandler();
        /// <summary>
        /// Raised when the grid filters are changed
        /// </summary>
        public event FiltersChangedHandler FiltersChanged;

        // Timer used to raise FiltersChanged after grid filters change
        private System.Timers.Timer FilterTimer = new System.Timers.Timer(600) { Enabled = false, AutoReset = false };

        /// <summary>
        /// Starts or restarts the filter changed timer
        /// </summary>
        private void StartFilterTimer()
        {
            if(FilterTimer.Enabled)
                this.FilterTimer.Stop();
            this.FilterTimer.Start();
        }

        void FilterTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            FiltersChangedInvoke();
        }

        /// <summary>
        /// Raise FiltersChanged event if anything is hooked up to it
        /// </summary>
        private void FiltersChangedInvoke()
        {
            if (FiltersChanged != null)
            {
                Dispatcher.Invoke(FiltersChanged, null);
            }
        }

        private void GridViewSource_Filter(object sender, FilterEventArgs e)
        {
            // [Re]start the timer
            this.StartFilterTimer();
        }