Class TreeView

Represents a control that displays hierarchical data in a tree structure that has items that can expand and collapse.

Inheritance
System.Object
DependencyObject
UIElement
FrameworkElement
Control
ItemsControl
TreeView
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: System.Windows.Controls
Assembly: OpenSilver.dll
Syntax
[StyleTypedProperty(Property = "ItemContainerStyle", StyleTargetType = typeof(TreeViewItem))]
public class TreeView : ItemsControl, IControl, IFrameworkElement, IUIElement, IDependencyObject

Constructors

| Improve this Doc View Source

TreeView()

Initializes a new instance of the TreeView class.

Declaration
public TreeView()

Fields

| Improve this Doc View Source

ItemContainerStyleProperty

Identifies the ItemContainerStyle dependency property.

Declaration
public static readonly DependencyProperty ItemContainerStyleProperty
Field Value
Type Description
DependencyProperty

The identifier for the ItemContainerStyle dependency property.
| Improve this Doc View Source

SelectedItemProperty

Identifies the SelectedItem dependency property.

Declaration
public static readonly DependencyProperty SelectedItemProperty
Field Value
Type Description
DependencyProperty

The identifier for the SelectedItem property.
| Improve this Doc View Source

SelectedValuePathProperty

Identifies the SelectedValuePath dependency property.

Declaration
public static readonly DependencyProperty SelectedValuePathProperty
Field Value
Type Description
DependencyProperty

The identifier for the SelectedValuePath dependency property.
| Improve this Doc View Source

SelectedValueProperty

Identifies the SelectedValue dependency property.

Declaration
public static readonly DependencyProperty SelectedValueProperty
Field Value
Type Description
DependencyProperty

The identifier for the SelectedValue dependency property.

Properties

| Improve this Doc View Source

ItemContainerStyle

Gets or sets the Style that is applied to the container element generated for each item.

Declaration
public Style ItemContainerStyle { get; set; }
Property Value
Type Description
Style

The Style applied to the container element that contains each item.
| Improve this Doc View Source

SelectedItem

Gets the selected item in a TreeView.

Declaration
public object SelectedItem { get; }
Property Value
Type Description
System.Object

The currently selected item or null if no item is selected. The default value is null.
| Improve this Doc View Source

SelectedValue

Gets the value of the SelectedItem property that is specified by the SelectedValuePath property.

Declaration
public object SelectedValue { get; }
Property Value
Type Description
System.Object

The value of the SelectedItem property that is specified by the SelectedValuePath property, or null if no item is selected. The default value is null.
| Improve this Doc View Source

SelectedValuePath

Gets or sets the property path that is used to get the SelectedValue property of the SelectedItem property in a TreeView.

Declaration
public string SelectedValuePath { get; set; }
Property Value
Type Description
System.String

The property path that is used to get the SelectedValue property of the SelectedItem property in a TreeView. The default value is System.String.Empty.

Methods

| Improve this Doc View Source

ClearContainerForItemOverride(DependencyObject, Object)

Removes all templates, styles, and bindings for the object displayed as a TreeViewItem.

Declaration
protected override void ClearContainerForItemOverride(DependencyObject element, object item)
Parameters
Type Name Description
DependencyObject element

The TreeViewItem element to clear.
System.Object item

The item that is contained in the TreeViewItem.
Overrides
| Improve this Doc View Source

GetContainerForItemOverride()

Creates a TreeViewItem to display content.

Declaration
protected override DependencyObject GetContainerForItemOverride()
Returns
Type Description
DependencyObject

A TreeViewItem to use as a container for content.
Overrides
| Improve this Doc View Source

IsItemItsOwnContainerOverride(Object)

Determines whether the specified item is a TreeViewItem, which is the default container for items in the TreeView control.

Declaration
protected override bool IsItemItsOwnContainerOverride(object item)
Parameters
Type Name Description
System.Object item

The object to evaluate.
Returns
Type Description
System.Boolean

True if the item is a TreeViewItem; otherwise, false.
Overrides
| Improve this Doc View Source

OnApplyTemplate()

Builds the visual tree for the TreeView control when a new control template is applied.

Declaration
public override void OnApplyTemplate()
Overrides
| Improve this Doc View Source

OnCreateAutomationPeer()

Returns a TreeViewAutomationPeer for use by the Silverlight automation infrastructure.

Declaration
protected override AutomationPeer OnCreateAutomationPeer()
Returns
Type Description
AutomationPeer

A TreeViewAutomationPeer for the TreeView control.
Overrides
| Improve this Doc View Source

OnGotFocus(RoutedEventArgs)

Provides handling for the GotFocus event.

Declaration
protected override void OnGotFocus(RoutedEventArgs e)
Parameters
Type Name Description
RoutedEventArgs e

Event arguments.
Overrides
| Improve this Doc View Source

OnItemsChanged(NotifyCollectionChangedEventArgs)

Makes adjustments to the TreeView control when the value of the Items property changes.

Declaration
protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e)
Parameters
Type Name Description
System.Collections.Specialized.NotifyCollectionChangedEventArgs e

A System.Collections.Specialized.NotifyCollectionChangedEventArgs that contains data about the change.
Overrides
| Improve this Doc View Source

OnKeyDown(KeyEventArgs)

Provides handling for the KeyDown event when a key is pressed while the control has focus.

Declaration
protected override void OnKeyDown(KeyEventArgs e)
Parameters
Type Name Description
KeyEventArgs e

A KeyEventArgs that contains the event data.
Overrides
Exceptions
Type Condition
System.ArgumentNullException

e is null.
| Improve this Doc View Source

OnKeyUp(KeyEventArgs)

Provides handling for the KeyUp event.

Declaration
protected override void OnKeyUp(KeyEventArgs e)
Parameters
Type Name Description
KeyEventArgs e

Event arguments.
Overrides
| Improve this Doc View Source

OnLostFocus(RoutedEventArgs)

Provides handling for the LostFocus event.

Declaration
protected override void OnLostFocus(RoutedEventArgs e)
Parameters
Type Name Description
RoutedEventArgs e

Event arguments.
Overrides
| Improve this Doc View Source

OnMouseEnter(MouseEventArgs)

Provides handling for the MouseEnter event.

Declaration
protected override void OnMouseEnter(MouseEventArgs e)
Parameters
Type Name Description
MouseEventArgs e

Event arguments.
Overrides
| Improve this Doc View Source

OnMouseLeave(MouseEventArgs)

Provides handling for the MouseLeave event.

Declaration
protected override void OnMouseLeave(MouseEventArgs e)
Parameters
Type Name Description
MouseEventArgs e

Event arguments.
Overrides
| Improve this Doc View Source

OnMouseLeftButtonDown(MouseButtonEventArgs)

Provides handling for the MouseLeftButtonDown event.

Declaration
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
Parameters
Type Name Description
MouseButtonEventArgs e

A MouseButtonEventArgs that contains the event data.
Overrides
| Improve this Doc View Source

OnMouseLeftButtonUp(MouseButtonEventArgs)

Provides handling for the MouseLeftButtonUp event.

Declaration
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
Parameters
Type Name Description
MouseButtonEventArgs e

Event arguments.
Overrides
| Improve this Doc View Source

OnMouseMove(MouseEventArgs)

Provides handling for the MouseMove event.

Declaration
protected override void OnMouseMove(MouseEventArgs e)
Parameters
Type Name Description
MouseEventArgs e

Event arguments.
Overrides
| Improve this Doc View Source

OnSelectedItemChanged(RoutedPropertyChangedEventArgs<Object>)

Raises the SelectedItemChanged event when the SelectedItem property value changes.

Declaration
protected virtual void OnSelectedItemChanged(RoutedPropertyChangedEventArgs<object> e)
Parameters
Type Name Description
RoutedPropertyChangedEventArgs<System.Object> e

A RoutedPropertyChangedEventArgs<T> that contains the event data.
| Improve this Doc View Source

PrepareContainerForItemOverride(DependencyObject, Object)

Prepares the container element to display the specified item.

Declaration
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
Parameters
Type Name Description
DependencyObject element

The container element used to display the specified item.
System.Object item

The item to display.
Overrides

Events

| Improve this Doc View Source

SelectedItemChanged

Occurs when the value of the SelectedItem property changes.

Declaration
public event RoutedPropertyChangedEventHandler<object> SelectedItemChanged
Event Type
Type Description
RoutedPropertyChangedEventHandler<System.Object>

Extension Methods