How to get index of parent node and child node in treeview?

Question

Hi All I need help from wpf experts since i am new to WPF. I need Index of parent Node and Child Node in the WPF Treeview. Please help me on this . Thanks Avnish

Avnish Kumar · Answer

Hi Mukesh Your code works perfactlly. Thanks a ton :) Approch :- XAML File Code Behind:- private void OnItemSelected(object sender RoutedEventArgs e) { TreeViewItem SelectedNode = e.OriginalSource as TreeViewItem; int ParentIndex = -1; int ChildIndex = -1; TreeViewItem ChildNode = ItemsControl.ItemsControlFromItemContainer(SelectedNode) as TreeViewItem; TreeView ParentNode = ItemsControl.ItemsControlFromItemContainer(SelectedNode) as TreeView; //get index if (ChildNode == null) { ParentIndex = ParentNode.ItemContainerGenerator.IndexFromContainer(SelectedNode); } else { ChildIndex = ChildNode.ItemContainerGenerator.IndexFromContainer(SelectedNode); ParentNode = ItemsControl.ItemsControlFromItemContainer(ChildNode) as TreeView; ParentIndex = ParentNode.ItemContainerGenerator.IndexFromContainer(ChildNode); dgData.ItemsSource = clsMCB.dsXml.ElementAt(0).Tables[ChildIndex].DefaultView; } }

Avnish Kumar · Answer

Adding Corresponding Method private void treeView_SelectedItemChanged(object sender RoutedPropertyChangedEventArgs e) { //int a = treeViewitem.Items.Count; //int index = 0; //if (treeViewitem .Items.Count >= 0) //{ // var tree = sender as TreeView; // if (tree.SelectedValue != null) // { // index++; // TreeViewItem item = tree.SelectedItem as TreeViewItem; // ItemsControl parent = ItemsControl.ItemsControlFromItemContainer(item); // while (parent != null && parent.GetType() == typeof(TreeViewItem)) // { // index++; // parent = ItemsControl.ItemsControlFromItemContainer(parent); // } // indexOfSelectedNode = index; // } //} //MessageBox.Show(indexOfSelectedNode.ToString()); TreeViewItem SelectedNode = e.OriginalSource as TreeViewItem; int ParentIndex = -1; int ChildIndex = -1; TreeViewItem ChildNode = ItemsControl.ItemsControlFromItemContainer(SelectedNode) as TreeViewItem; TreeView ParentNode = ItemsControl.ItemsControlFromItemContainer(SelectedNode) as TreeView; //get index if (ChildNode == null) { ParentIndex = ParentNode.ItemContainerGenerator.IndexFromContainer(SelectedNode); } else { ChildIndex = ChildNode.ItemContainerGenerator.IndexFromContainer(SelectedNode); // Resets parent node to check child node ParentNode = ItemsControl.ItemsControlFromItemContainer(ChildNode) as TreeView; ParentIndex = ParentNode.ItemContainerGenerator.IndexFromContainer(ChildNode); }

Avnish Kumar · Answer

Hi Mukesh Thanks for Quick Reply .... When i am debugging your code i am finding that when below line is executing TreeViewItem SelectedNode = e.OriginalSource as TreeViewItem; SelectedNode value is coming null for your reference i am pating the XAML Code and TreeViewItems i am loading runtime. --> --> .Cs File Code private void treeView_SelectedItemChanged(object sender RoutedPropertyChangedEventArgs e) { //int a = treeViewitem.Items.Count; //int index = 0; //if (treeViewitem .Items.Count >= 0) //{ // var tree = sender as TreeView; // if (tree.SelectedValue != null) // { // index++; // TreeViewItem item = tree.SelectedItem as TreeViewItem; // ItemsControl parent = ItemsControl.ItemsControlFromItemContainer(item); // while (parent != null && parent.GetType() == typeof(TreeViewItem)) // { // index++; // parent = ItemsControl.ItemsControlFromItemContainer(parent); // } // indexOfSelectedNode = index; // } //} //MessageBox.Show(indexOfSelectedNode.ToString()); TreeViewItem SelectedNode = e.OriginalSource as TreeViewItem; int ParentIndex = -1; int ChildIndex = -1; TreeViewItem ChildNode = ItemsControl.ItemsControlFromItemContainer(SelectedNode) as TreeViewItem; TreeView ParentNode = ItemsControl.ItemsControlFromItemContainer(SelectedNode) as TreeView; //get index if (ChildNode == null) { ParentIndex = ParentNode.ItemContainerGenerator.IndexFromContainer(SelectedNode); } else { ChildIndex = ChildNode.ItemContainerGenerator.IndexFromContainer(SelectedNode); // Resets parent node to check child node ParentNode = ItemsControl.ItemsControlFromItemContainer(ChildNode) as TreeView; ParentIndex = ParentNode.ItemContainerGenerator.IndexFromContainer(ChildNode); }

Mukesh Kumar · Answer

Hi You can get the index of parent and child node like this.. http://www.codeproject.com/Articles/20645/WPF-TreeView-Selection private void OnItemSelected(System.Object sender System.Windows.RoutedEventArgs e) { TreeViewItem SelectedNode = e.OriginalSource as TreeViewItem; int ParentIndex = -1; int ChildIndex = -1; TreeViewItem ChildNode = ItemsControl.ItemsControlFromItemContainer(SelectedNode) as TreeViewItem; TreeView ParentNode = ItemsControl.ItemsControlFromItemContainer(SelectedNode) as TreeView; //get index if (ChildNode == null) { ParentIndex = ParentNode.ItemContainerGenerator.IndexFromContainer(SelectedNode); } else { ChildIndex = ChildNode.ItemContainerGenerator.IndexFromContainer(SelectedNode); // Resets parent node to check child node ParentNode = ItemsControl.ItemsControlFromItemContainer(ChildNode) as TreeView; ParentIndex = ParentNode.ItemContainerGenerator.IndexFromContainer(ChildNode); } } Hope this will help you. thanks