#Wpf treeview example how to#
#Wpf treeview example code#

then restore selection change notifications Var treeViewItem = treeView.SelectedItem as TreeViewItem TreeView.SelectedItemChanged += (a, b) => If (IsSelectionChangeActiveProperty=null) Public static void AllowMultiSelection(TreeView treeView) Private static readonly PropertyInfo IsSelectionChangeActivePropertyīindingFlags.NonPublic | BindingFlags.Instance) However the draw back is the use of the non public property, IsSelectionChangeActive, of the treeview class.

#Wpf treeview example code#

The code below works fine and is much simpler. The top level code is located in MyTreeView_SelectedItemChanged function and called when SelectedItemChanged event is fired on the TreeView. If LeftCtrl key is pressed, the previous selections are not cleaned. If LeftCtrl key is not pressed, then, before selecting an item, we clean all the previous selections. The selected items change their Background and Foreground properties to Brushes.Black and Brushes.White correspondingly. The set is simulated by a Dictionary with null values. We explore this with a practical application on searching and filtering the content of a large WPF. This article is about visiting nodes in a tree view, which is required to perform operations, such as: load, save, and filtering of tree view nodes. Simulating the Multi-SelectionĪs stated above, we disable the WPF selection and, instead use our own selection mechanism, according to which, all TreeViewItem elements that have been selected are stored in selectedItems set. We are investigating advanced WPF tree view implementations building on 1 and 2. The shift key and ctrl-A multi-select functions were not added (again for the lack of time), but can be added in exactly the same manner. To multi-select, you should use the left ctrl key on your keyboard together with the mouse.

#Wpf treeview example how to#

Ideally another user control called, say MultiSelectTreeView, should be created and packed in a separate DLL, but since I do not have much time to spend on it, I simply showed how to do it by modifying the code in the main Window class. I say 'simulate' because it discards the WPF select mechanism and replaces it with its own. This article shows a very simple example that simulates multi-select capability for a WPF TreeView control. WPF TreeView control does not give developers an ability to multi-select the nodes of the tree. I plan to write another article that will incorporate the samples from my earliest articles making them work. Note - this is one of my earliest articles and I cannot guarantee that the sample is working and the presentation is clear.