Steps to reproduce:
1. Click filter icon in column
2. Enter invalid value in filter input
3. Press Filter, the value gets underlined, suggesting some kind of error.
4. Click the place marked 1 and then 2.
This time, it seems a message appears about the cause of the error, but it doesn’t fit inside the control.
One of the following two exceptions occur when the BindingOperations.EnableCollectionSynchronization() is used with the ItemsSource of RadTreeListView:
- System.InvalidOperationException: 'Collection was modified; enumeration operation may not execute.'
- System.NullReferenceException: 'Object reference not set to an instance of an object.'
When using the EnableCollectionSynchronization, the corresponding items control should allow updates of the ItemsSource collection on different threads. This is valid if the requirements to use the EnableCollectionSynchronization method are met.
The exception stack traces are:
InvalidOperationException
at System.ThrowHelper.ThrowInvalidOperationException_InvalidOperation_EnumFailedVersion() in /_/src/libraries/System.Private.CoreLib/src/System/ThrowHelper.cs:line 432
at System.Collections.Generic.List`1.Enumerator.MoveNext() in /_/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/List.cs:line 1130
at System.Linq.Enumerable.SelectEnumerableIterator`2.MoveNext()
at Telerik.Windows.Data.EnumerableExtensions.<SelectRecursive>d__15`1.MoveNext()
at System.Linq.Enumerable.SelectEnumerableIterator`2.MoveNext()
at Telerik.Windows.Data.HierarchicalCollectionViewBase.PopulateInternalList(IQueryable view)
at Telerik.Windows.Data.QueryableCollectionView.get_InternalList()
at Telerik.Windows.Data.HierarchicalCollectionViewBase.get_InternalCount()
at Telerik.Windows.Data.DataItemCollection.get_Item(Int32 index)
at Telerik.Windows.Controls.GridView.Rows.GetRowItemsAtRange(Int32 startIndex, Int32 endIndex)
at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.RealizeRows(Int32 startIndex, Int32 endIndex, Double& verticalOffset, HashSet`1& realizedRows)
at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.MeasureOverride(Size availableSize)
at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(Size availableSize)NullReferenceException at Telerik.Windows.Data.QueryableCollectionView.InternalGetItemAt(Int32 index) in Telerik.Windows.Data\QueryableCollectionView.cs:line 3081 at Telerik.Windows.Controls.GridView.Rows.GetRowItemsAtRange(Int32 startIndex, Int32 endIndex) at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.RealizeRows(Int32 startIndex, Int32 endIndex, Double& verticalOffset, HashSet`1& realizedRows) at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.MeasureOverride(Size availableSize) at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(Size availableSize)
To work this around dispatch the updates of the ItemsSource collection to the main UI thread.
Dispatcher.BeginInvoke(new Action(() =>
{
// add/remove items from the source collection
}));
The horizontal scrollbar of RadTreeListView is displayed even the setup suggest that it should not be. For example, this happens if you have a single column with its Width set to * which means that the RadGridView should span in the available space without the need of displaying a horizontal scrollbar. To recreate this the RowIndicatorVisibility property should be set to Collapsed. Additional to that there should be a hierarchy and the items should be expanded.
To work this around, you can set a fixed Width for the column. If you want this to be dynamic you can calculate the width on SizeChanged of RadTreeListView
By default the AutoExpandItemsAfterFilter property of RadTreeListView is set to True, which means that when you filter the data, the parents of all found child items will be expanded automatically. However, if you call the CollapseAllHierarchyItems method this functionality stops working.
To work this around, you can reset the ItemsSource property instead of using the CollapseAllHierarchyItems.
To work this around, you can hide the pointer over background completely. To do this, you can edit the ControlTemplate of RadListView item and remove the Setter from the PointerOver Visual State.
Add a mechanism to allow this type of selection. It can be built-in or some events or method overrides can be introduceds in order to be bale to easily interfere and customize the extended selection.
this.RadTreeListView.SelectedCells.Clear();
