Also, this program shows how to create a TreeNode and specify that it has children nodes. It uses an array creation expression to create a two-element array of TreeNode references. Then: It creates another node and specifies that array reference as the second parameter. The nodes in the array are children nodes. Next in this tutorial, we look at how you can add a double-click event handler to your TreeView program. This means that when the user double-clicks on an item, you can execute code based on that node.

Then, select "MouseDoubleClick" and click twice on that entry. Using SelectedNode property. This returns the selected node if a node is selected. And: After a double-click, a node is selected so this returns a reference to that node in the object model. Using Text property. This returns a reference to the string that represents the text in the TreeNode. Add nod ; treeView1. The After Select event handler is used to populate the text boxes used to display information from the selected node its Name, Text, Tag, and Parent text properties.

The find functions described later highlight all found nodes in response to a search by setting the background color of each matching node to Yellow; the click event handler for the TreeView is used to remove all such highlighting. ToString ; txtText. ToString ; txtTag. ToString ; txtParentName. The method of finding a node by its name is the only find function directly supported by the TreeView; if you want to find a node by something other than its name, you will have to write your own methods to do so.

This click event handler populates an array of nodes with matching names. The find method accepts two arguments; the first argument is the search term and the second is a Boolean value used to determine whether or not child nodes should also be included in the search; in this case, the search term is collected from a text box on the form and the option of searching child nodes is enabled by setting the second argument to true.

Once the collection of nodes is created, each matching node has its background color set to yellow so as to highlight the node in the TreeView. Prior to setting the background color of the matching nodes, all of the other nodes in the TreeView are set back to having white backgrounds by calling the Clear Back Color method. Find txtNodeSearch. This process relies on two separate methods. The first method creates an instance of a tree node collection containing all of the nodes in the form's TreeView control.

Each of the nodes in the collection is passed to a second method Clear Recursive ; this second method is passed the current node.

The Clear Recursive method loops through all of the nodes contained within the passed in nodes node collection and sets the background color of each of those nodes to the color white. Each node is then passed recursively back to the same Clear Recursive method where each node's node collection is processed until there are no more nodes remaining to process. In this way, each node and child node in the entire tree is processed.

While this process is used merely to set each node's background color to white, the same approach may be used whenever the entire tree must be processed; in fact, the remaining search methods will do just that. The form contains a group box used to set a text search term and evoke the method from a button click event handler.

The button click first clears all highlighted nodes by calling the Clear Back Color method. After the nodes are all restored to white backgrounds, the handler calls the Find By Text method; this method works much like the method described for clearing the background color.

The method assembles a collection of the tree view nodes and then passes each node to the recursive method. The find recursive method looks for nodes with text properties matching the search expression, and when a match is found, sets the background color to yellow. Each processed node is passed back to the find recursive method that will continue to examine each node until all of the nodes in the tree have been evaluated. Text tn. These methods work much like the last method with the exception that the matches are determined by their tag values rather than their text values.

The Code: Form 2 - New Node Form The code supplied in the New Node form is used merely to capture the user-supplied values used to populate a newly created node's name, text, and tag properties. The form is displayed as a dialog and appears in response to the user requesting the addition of a new node from the main form of the application.

Invoked when an unhandled DragEnter attached event reaches an element in its route that is derived from this class. Invoked when an unhandled DragLeave attached event reaches an element in its route that is derived from this class. Invoked when an unhandled DragOver attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled GiveFeedback attached event reaches an element in its route that is derived from this class. Raises the GotFocus routed event. Invoked whenever an unhandled GotFocus event reaches this element in its route.

Invoked when an unhandled GotKeyboardFocus attached event reaches an element in its route that is derived from this class. Invoked when an unhandled GotMouseCapture attached event reaches an element in its route that is derived from this class. Invoked when an unhandled GotStylusCapture attached event reaches an element in its route that is derived from this class. Provides class handling for the GotTouchCapture routed event that occurs when a touch is captured to this element.

Invoked when the GroupStyleSelector property changes. Raises the Initialized event. This method is invoked whenever IsInitialized is set to true internally. Invoked when an unhandled IsKeyboardFocusedChanged event is raised on this element. Invoked when an unhandled IsMouseCapturedChanged event is raised on this element. Invoked when an unhandled IsStylusCapturedChanged event is raised on this element. Invoked when the ItemBindingGroup property changes.

Invoked when the ItemContainerStyle property changes. Invoked when the ItemContainerStyleSelector property changes. Provides class handling for an ItemsChanged event that occurs when there is a change in the Items collection. Invoked when the ItemsPanel property changes. Called when the ItemsSource property changes. Invoked when the ItemStringFormat property changes. Invoked when the ItemTemplate property changes. Invoked when the ItemTemplateSelector property changes. Provides class handling for the KeyDown event for a TreeView.

Invoked when an unhandled KeyUp attached event reaches an element in its route that is derived from this class. Raises the LostFocus routed event by using the event data that is provided.

Invoked when an unhandled LostKeyboardFocus attached event reaches an element in its route that is derived from this class. Invoked when an unhandled LostMouseCapture attached event reaches an element in its route that is derived from this class. Invoked when an unhandled LostStylusCapture attached event reaches an element in its route that is derived from this class. Provides class handling for the LostTouchCapture routed event that occurs when this element loses a touch capture.

Called when the ManipulationBoundaryFeedback event occurs. Called when the ManipulationCompleted event occurs. Called when the ManipulationDelta event occurs. Called when the ManipulationInertiaStarting event occurs. Called when the ManipulationStarted event occurs.

Provides class handling for the ManipulationStarting routed event that occurs when the manipulation processor is first created. Raises the MouseDoubleClick routed event. Invoked when an unhandled MouseDown attached event reaches an element in its route that is derived from this class. Invoked when an unhandled MouseEnter attached event is raised on this element. Invoked when an unhandled MouseLeave attached event is raised on this element. Invoked when an unhandled MouseLeftButtonDown routed event is raised on this element.

Invoked when an unhandled MouseLeftButtonUp routed event reaches an element in its route that is derived from this class. Invoked when an unhandled MouseMove attached event reaches an element in its route that is derived from this class. Invoked when an unhandled MouseRightButtonDown routed event reaches an element in its route that is derived from this class. Invoked when an unhandled MouseRightButtonUp routed event reaches an element in its route that is derived from this class.

Invoked when an unhandled MouseUp routed event reaches an element in its route that is derived from this class. Invoked when an unhandled MouseWheel attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewDragEnter attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewDragLeave attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewDragOver attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewDrop attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewGiveFeedback attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewGotKeyboardFocus attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewKeyDown attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewKeyUp attached event reaches an element in its route that is derived from this class.

Raises the PreviewMouseDoubleClick routed event. Invoked when an unhandled PreviewMouseDown attached routed event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewMouseLeftButtonDown routed event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewMouseLeftButtonUp routed event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewMouseMove attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewMouseRightButtonDown routed event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewMouseRightButtonUp routed event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewMouseUp attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewMouseWheel attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewQueryContinueDrag attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewStylusButtonDown attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewStylusButtonUp attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewStylusDown attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewStylusInAirMove attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewStylusInRange attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewStylusMove attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewStylusOutOfRange attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled PreviewStylusSystemGesture attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewStylusUp attached event reaches an element in its route that is derived from this class. Invoked when an unhandled PreviewTextInput attached event reaches an element in its route that is derived from this class. Provides class handling for the PreviewTouchDown routed event that occurs when a touch presses this element.

Provides class handling for the PreviewTouchMove routed event that occurs when a touch moves while inside this element. Provides class handling for the PreviewTouchUp routed event that occurs when a touch is released inside this element. Invoked whenever the effective value of any dependency property on this FrameworkElement has been updated. The specific dependency property that changed is reported in the arguments parameter.

Invoked when an unhandled QueryContinueDrag attached event reaches an element in its route that is derived from this class. Invoked when an unhandled QueryCursor attached event reaches an element in its route that is derived from this class. When overridden in a derived class, participates in rendering operations that are directed by the layout system.

The rendering instructions for this element are not used directly when this method is invoked, and are instead preserved for later asynchronous use by layout and drawing. Raises the SizeChanged event, using the specified information as part of the eventual event data.

Invoked when an unhandled StylusButtonDown attached event reaches an element in its route that is derived from this class. Invoked when an unhandled StylusButtonUp attached event reaches an element in its route that is derived from this class. Invoked when an unhandled StylusDown attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled StylusEnter attached event is raised by this element. Invoked when an unhandled StylusInAirMove attached event reaches an element in its route that is derived from this class. Invoked when an unhandled StylusInRange attached event reaches an element in its route that is derived from this class. Invoked when an unhandled StylusLeave attached event is raised by this element. Invoked when an unhandled StylusMove attached event reaches an element in its route that is derived from this class.

Invoked when an unhandled StylusOutOfRange attached event reaches an element in its route that is derived from this class. Invoked when an unhandled StylusSystemGesture attached event reaches an element in its route that is derived from this class. Invoked when an unhandled StylusUp attached event reaches an element in its route that is derived from this class. Invoked when the TextInput event is received.

Invoked whenever an unhandled ToolTipClosing routed event reaches this class in its route. Invoked whenever the ToolTipOpening routed event reaches this class in its route.

Provides class handling for the TouchDown routed event that occurs when a touch presses inside this element. Provides class handling for the TouchEnter routed event that occurs when a touch moves from outside to inside the bounds of this element. Provides class handling for the TouchLeave routed event that occurs when a touch moves from inside to outside the bounds of this UIElement. Provides class handling for the TouchMove routed event that occurs when a touch moves while inside this element.

Provides class handling for the TouchUp routed event that occurs when a touch is released inside this element. Called when the VisualCollection of the visual object is modified. Invoked when the parent of this element in the visual tree is changed. Supports incremental layout implementations in specialized subclasses of FrameworkElement. ParentLayoutInvalidated UIElement is invoked when a child element has invalidated a property that is marked in metadata as affecting the parent's measure or arrange passes during layout.

Converts a Point in screen coordinates into a Point that represents the current coordinate system of the Visual. Converts a Point that represents the current coordinate system of the Visual into a Point in screen coordinates.

Determines the next element that would receive focus relative to this element for a provided focus movement direction, but does not actually move the focus. Raises a specific routed event. The RoutedEvent to be raised is identified within the RoutedEventArgs instance that is provided as the RoutedEvent property of that event data. Provides an accessor that simplifies access to the NameScope registration method. Removes the provided object from this element's logical tree.

FrameworkElement updates the affected logical tree parent pointers to keep in sync with this deletion. Attaches a binding to this element, based on the provided source property name as a path qualification to the data source.

Searches for a resource with the specified name and sets up a resource reference to it for the specified property. Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. Returns a value that indicates whether to apply the style from the ItemContainerStyle or ItemContainerStyleSelector property to the container element of the specified item.

Returns whether serialization processes should serialize the contents of the CommandBindings property on instances of this class. Returns a value that indicates whether serialization processes should serialize the effective value of the GroupStyle property. Returns whether serialization processes should serialize the contents of the InputBindings property on instances of this class. Returns a value that indicates whether serialization processes should serialize the effective value of the Items property.

Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property. Returns whether serialization processes should serialize the contents of the Resources property. Returns whether serialization processes should serialize the contents of the Style property. Returns whether serialization processes should serialize the contents of the Triggers property.

Provides a string representation of the ItemsControl object. Returns a transform that can be used to transform coordinates from the Visual to the specified Visual ancestor of the visual object.

Returns a transform that can be used to transform coordinates from the Visual to the specified Visual3D ancestor of the visual object. Returns a transform that can be used to transform coordinates from the Visual to the specified visual object descendant.

Returns a transform that can be used to transform coordinates from the Visual to the specified visual object. Translates a point relative to this element to coordinates that are relative to the specified element. Simplifies access to the NameScope de-registration method. Reapplies the default style to the current FrameworkElement. Enforces that the calling thread has access to this DispatcherObject. Occurs when the input system reports an underlying drag event with this element as the drag target.

Occurs when the input system reports an underlying drag event with this element as the drag origin. Occurs when the input system reports an underlying drag event with this element as the potential drop target. Occurs when the input system reports an underlying drop event with this element as the drop target. Occurs when the value of the Focusable property changes. Occurs when the input system reports an underlying drag-and-drop event that involves this element. Occurs when this FrameworkElement is initialized.

This event coincides with cases where the value of the IsInitialized property changes from false or undefined to true. Occurs when the value of the IsEnabled property on this element changes. Occurs when the value of the IsHitTestVisible dependency property changes on this element.

Occurs when the value of the IsKeyboardFocused property changes on this element. Occurs when the value of the IsKeyboardFocusWithin property changes on this element. Occurs when the value of the IsMouseCaptured property changes on this element. Occurs when the value of the IsMouseDirectlyOver property changes on this element. Occurs when the value of the IsStylusCaptured property changes on this element. Occurs when the value of the IsStylusCaptureWithin property changes on this element.

Occurs when the value of the IsStylusDirectlyOver property changes on this element. Occurs when the value of the IsVisible property changes on this element. Occurs when the layout of the various visual elements associated with the current Dispatcher changes.

Occurs when a manipulation and inertia on the UIElement object is complete. Occurs when the input device loses contact with the UIElement object during a manipulation and inertia begins. Occurs when an input device begins a manipulation on the UIElement object. Occurs when there is a change in the keyboard or mouse button state during a drag-and-drop operation. Occurs when the stylus moves while over the element.

The stylus must move while being detected by the digitizer to raise this event, otherwise, PreviewStylusInAirMove is raised instead. Occurs when the cursor is requested to display. This event is raised on an element each time that the mouse pointer moves to a new location, which means the cursor object might need to be changed based on its new position. Occurs when BringIntoView Rect is called on this element. Occurs when the SelectedItem changes.

Occurs when either the ActualHeight or the ActualWidth properties change value on this element. Occurs when the stylus moves over this element. The stylus must move while on the digitizer to raise this event.

Otherwise, StylusInAirMove is raised instead. This member supports the Windows Presentation Foundation WPF infrastructure and is not intended to be used directly from your code. Skip to main content. This browser is no longer supported.

Download Microsoft Edge More info. Contents Exit focus mode. Tree View Class Reference Is this page helpful? Please rate your experience Yes No. Any additional feedback? Namespace: System. Controls Assembly: PresentationFramework. Note Setting a visual property only has an effect if that property is both present in the control's default template and is set by using a TemplateBinding. In this article. Gets the rendered height of this element. Inherited from FrameworkElement.

Gets the rendered width of this element. Inherited from UIElement. Inherited from ItemsControl. Gets a value that indicates whether at least one touch is captured to this element.

Gets a value that indicates whether at least one touch is pressed over this element.

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