Hi,

We have a heterogeneous hierarchical wintree representation, the tree is constructed by binding each to node, the code used for binding is as below,

this.winTree.Nodes.SetDataBinding(dataView, null); - For root binding

treeNode.Nodes.SetDataBinding(dataView, null); - While binding each node in a tree

The binding works perfectly fine, however deleting few nodes and then calling the Clear() method of the datatable results in an "Object reference... " error.

One way to resolve this issue is to the set the deleted treenodes binding to null (this should be done for each deleted node which is tricky because sometimes a delete could happen directly on the datatable) as show below,

ultraTreeNode.Nodes.SetDataBinding(null, null);

We are not sure why the tree should behave in this manner, is this a known issue or is there a generic solution (other than setting the binding to null).  Please provide your views on the same.

The stack trace is as below,

1) Exception Information

*********************************************

Exception Type: System.NullReferenceException

Message: Object reference not set to an instance of an object.

Data: System.Collections.ListDictionaryInternal

TargetSite: Infragistics.Win.UltraWinTree.UltraTreeColumnSet GetColumnSet(Infragistics.Win.UltraWinTree.NodeColumnRelationship)

HelpLink: NULL

Source: Infragistics2.Win.UltraWinTree.v10.2

StackTrace Information

*********************************************

   at Infragistics.Win.UltraWinTree.UltraTreeNode.GetColumnSet(NodeColumnRelationship relationship)

   at Infragistics.Win.UltraWinTree.UltraTreeNode.get_DisplayColumnSetResolved()

   at Infragistics.Win.UltraWinTree.UltraTreeNode.GetDataColumnFromDisplayColumn(UltraTreeNodeColumn displayColumn, Boolean allowNull)

   at Infragistics.Win.UltraWinTree.UltraTreeNode.GetDataColumnFromDisplayColumn(UltraTreeNodeColumn displayColumn)

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.TreeNodesCollectionComparer.CompareHelper(Object x, Object y, UltraTreeColumnSet columnSet, IComparer sortComparer, SortType sort)

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.TreeNodesCollectionComparer.System.Collections.IComparer.Compare(Object x, Object y)

   at Infragistics.Win.Utilities.ComparerWrapper`1.Compare(T x, T y)

   at Infragistics.Win.Utilities.SortMergeHelper[T](T[] arr, T[] tmpArr, IComparer`1 comparer, Int32 si, Int32 ei)

   at Infragistics.Win.Utilities.SortMerge(Object[] arr, Object[] tmpArr, IComparer comparer, Int32 si, Int32 ei)

   at Infragistics.Win.Utilities.SortMerge(Object[] arr, Object[] tmpArr, IComparer comparer)

   at Infragistics.Win.Utilities.SortMerge(ArrayList arrayList, IComparer comparer)

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.Sort(Boolean checkVersion, Boolean checkSortResolved)

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.SortByColumns(Boolean checkVersion)

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.VerifySortVersion()

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.GetEnumerator()

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.CacheBoundNodes(Boolean recursive)

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.ResetDataBinding()

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.dataList_Reset(ListChangedEventArgs e)

   at Infragistics.Win.UltraWinTree.TreeNodesCollection.dataList_ListChanged(Object sender, ListChangedEventArgs e)

   at System.ComponentModel.ListChangedEventHandler.Invoke(Object sender, ListChangedEventArgs e)

   at System.Data.DataView.OnListChanged(ListChangedEventArgs e)

   at System.Data.DataView.IndexListChanged(Object sender, ListChangedEventArgs e)

   at System.Data.DataView.IndexListChangedInternal(ListChangedEventArgs e)

   at System.Data.DataViewListener.IndexListChanged(ListChangedEventArgs e)

   at System.Data.Index.<OnListChanged>b__2(DataViewListener listener, ListChangedEventArgs args, Boolean arg2, Boolean arg3)

   at System.Data.Listeners`1.Notify[T1,T2,T3](T1 arg1, T2 arg2, T3 arg3, Action`4 action)

   at System.Data.Index.OnListChanged(ListChangedEventArgs e)

   at System.Data.Index.FireResetEvent()

   at System.Data.Index.Reset()

   at System.Data.DataTable.ResetInternalIndexes(DataColumn column)

   at System.Data.DataTable.Clear(Boolean clearAll)

   at System.Data.DataTable.Clear()

...

...

Thanks,

spm