/// <summary>
/// Cancel pending edits and then execute a refresh on the collection view to prevent any exceptions thrown.
/// </summary>
/// <param name="collectionView">The list collection view that should be refreshed.</param>
public static void SafeRefresh(this ListCollectionView collectionView)
{
if (collectionView.IsEditingItem)
{
collectionView.CancelEdit();
}
collectionView.Refresh();
}
// There is a weird bug in DataGrid that blows if there is a sort in place when items are changed.
//
//System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: 'Sorting' is not allowed during an AddNew or EditItem transaction.
//at System.Windows.Data.ListCollectionView.SortDescriptionsChanged(Object sender, NotifyCollectionChangedEventArgs e)
//at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
//at System.Windows.Controls.ItemCollection.CloneList(IList clone, IList master)
//at System.Windows.Controls.ItemCollection.SynchronizeSortDescriptions(NotifyCollectionChangedEventArgs e, SortDescriptionCollection origin, SortDescriptionCollection clone)
//at System.Windows.Controls.ItemCollection.SortDescriptionsChanged(Object sender, NotifyCollectionChangedEventArgs e)
//at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
//at System.Windows.Controls.DataGrid.ClearSortDescriptionsOnItemsSourceChange()
//at System.Windows.Controls.DataGrid.OnCoerceItemsSourceProperty(DependencyObject d, Object baseValue)
//at System.Windows.DependencyObject.ProcessCoerceValue(DependencyProperty dp, PropertyMetadata metadata, EntryIndex& entryIndex, Int32& targetIndex, EffectiveValueEntry& newEntry, EffectiveValueEntry& oldEntry, Object& oldValue, Object baseValue, Object controlValue, CoerceValueCallback coerceValueCallback, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, Boolean skipBaseValueChecks)
//at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
//at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
//at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
//at Walkabout.Views.Controls.TransactionsView.Display(IList data, TransactionViewName name, String caption, Int64 selectedRowId)
public void SetItemsSource(IEnumerable items)
{
ListCollectionView view = CollectionViewSource.GetDefaultView(this.ItemsSource) as ListCollectionView;
if (view != null)
{
if (view.IsAddingNew || view.IsEditingItem)
{
if (view.IsAddingNew)
{
try
{
view.CancelNew();
}
catch
{
}
}
else if (view.IsEditingItem)
{
try
{
view.CancelEdit();
}
catch
{
// sometimes this throws but also removes IsEditing...
}
}
}
}
var sorted = RemoveSort();
if (sorted != null)
{
this.sorted = sorted;
}
try
{
// sometimes we get a weird exception saying
// 'DeferRefresh' is not allowed during an AddNew or EditItem transaction
this.ItemsSource = items;
}
catch (Exception ex)
{
// I want to see these errors
if (MessageBoxEx.Show(ex.ToString() + "\n\nDo you want to try again?", "Debug Error", MessageBoxButton.OKCancel, MessageBoxImage.Error) == MessageBoxResult.OK)
{
// and try again later...at low priority so that the UI has a chance to settle down...
Dispatcher.BeginInvoke(new Action(() =>
{
SetItemsSource(items);
}), DispatcherPriority.Background);
}
}
}
