internal override void ForceRefresh(bool sendResetNotification, bool initialLoad, bool setCurrentToFirstOnInitialLoad)
{
if (this.Refreshing)
{
throw new InvalidOperationException("An attempt was made to refresh the DataGridVirtualizingCollectionView while it is already in the process of refreshing.");
}
if (this.IsRefreshingDistinctValues)
{
throw new InvalidOperationException("An attempt was made to refresh the DataGridVirtualizingCollectionView while it is already in the process of refreshing distinct values.");
}
this.SetCurrentEditItem(null);
int oldCurrentPosition = -1;
if (!initialLoad)
{
this.SaveCurrentBeforeReset(out oldCurrentPosition);
}
using (this.DeferCurrencyEvent())
{
this.Refreshing = true;
try
{
lock (this.SyncRoot)
{
lock (this.DeferredOperationManager)
{
this.DeferredOperationManager.ClearDeferredOperations();
// We explicitly go through base so we do not end-up creating a RootGroup if there is none existing at the moment.
DataGridVirtualizingCollectionViewGroupBase rootGroup = base.RootGroup as DataGridVirtualizingCollectionViewGroupBase;
if (rootGroup != null)
{
DataGridPageManagerBase pageManager = rootGroup.GetVirtualPageManager();
// The pageManager can be null when no queryable source was set yet.
if (pageManager != null)
{
// Disconnect the PageManager so that subsequent Items/Count interrogations are not processed.
pageManager.Disconnect();
// Restart all virtual lists. The DataGridPageManagerBase will make a call to ForceRefresh once everything has been restarted if
// commit operations had to be made.
pageManager.Restart();
}
}
// Ensure to clear the DistinctValues cache when refreshing
// since the source could have changed
this.ResetDistinctValues();
base.RootGroup = this.CreateNewRootGroup();
// We set the current item to -1 to prevent the developper to get an invalid position.
// We will replace the current item to the correct one later.
this.SetCurrentItem(-1, null, false, false);
}
}
}
finally
{
this.Refreshing = false;
}
if (initialLoad)
{
this.Loaded = true;
}
else
{
this.AdjustCurrencyAfterReset(oldCurrentPosition);
}
if (sendResetNotification)
{
this.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
this.OnPropertyChanged(new PropertyChangedEventArgs("Groups"));
}
}
