Class TreeViewExtensions

Provides useful extensions to TreeView and TreeViewItem instances.

Inheritance

System.Object

TreeViewExtensions

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

public static class TreeViewExtensions

Fields

IsCheckedProperty

Identifies the IsChecked dependency property.

Declaration

public static readonly DependencyProperty IsCheckedProperty

Field Value

Type	Description
DependencyProperty

Methods

ClearSelection(TreeView)

Clear the selection of the TreeView.

Declaration

public static void ClearSelection(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

CollapseAll(TreeView)

Collapse all of the items in a TreeView.

Declaration

public static void CollapseAll(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

CollapseAllButSelectedPath(TreeView)

Collapse all TreeViewItems except those along the path from the TreeView's SelectedItem to the root of the TreeView.

Declaration

public static void CollapseAllButSelectedPath(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

ExpandAll(TreeView)

Expand all of the items in a TreeView.

Declaration

public static void ExpandAll(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

ExpandPath(TreeView, Object[])

Expand the given path of items starting from the TreeView's root.

Declaration

public static void ExpandPath(this TreeView view, params object[] items)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Object[]	items	The sequence of items corresponding to the path to expand.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.
System.ArgumentNullException	items is null.

ExpandPath(TreeViewItem)

Expand a path from the TreeViewItem to the root of the TreeView.

Declaration

public static void ExpandPath(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

ExpandPath<T>(TreeView, IEnumerable<T>)

Expand the given path of items starting from the TreeView's root.

Declaration

public static void ExpandPath<T>(this TreeView view, IEnumerable<T> items)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Collections.Generic.IEnumerable<T>	items	The sequence of items corresponding to the path to expand.

Type Parameters

Name	Description
T	The type of items provided in items.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.
System.ArgumentNullException	items is null.

ExpandPath<T>(TreeView, Func<Object, T>, T[])

Expand the given path of items starting from the TreeView's root.

Declaration

public static void ExpandPath<T>(this TreeView view, Func<object, T> comparisonSelector, params T[] items)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Func<System.Object, T>	comparisonSelector	A function that takes a TreeViewItem's item and returns a value to compare against elements of the given items. The item itself will be used if comparisonSelector is null.
T[]	items	The sequence of items corresponding to the path to expand.

Type Parameters

Name	Description
T	The type of items provided in items.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.
System.ArgumentNullException	items is null.

ExpandPath<T>(TreeView, Func<Object, T>, IEnumerable<T>)

Expand the given path of items starting from the TreeView's root.

Declaration

public static void ExpandPath<T>(this TreeView view, Func<object, T> comparisonSelector, IEnumerable<T> items)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Func<System.Object, T>	comparisonSelector	A function that takes a TreeViewItem's item and returns a value to compare against elements of the given items. The item itself will be used if comparisonSelector is null.
System.Collections.Generic.IEnumerable<T>	items	The sequence of items corresponding to the path to expand.

Type Parameters

Name	Description
T	The type of items provided in items.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.
System.ArgumentNullException	items is null.

ExpandSelectedPath(TreeView)

Expand the path from the SelectedItem to the root of the TreeView.

Declaration

public static void ExpandSelectedPath(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

ExpandToDepth(TreeView, Int32)

Expand a specified number of layers in a TreeView.

Declaration

public static void ExpandToDepth(this TreeView view, int depth)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Int32	depth	The number of layers to expand.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetCheckedItemsAndContainers(TreeView)

Get the sequence of items and containers with their IsChecked property set to True.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetCheckedItemsAndContainers(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	The sequence of items and containers with their IsChecked property set to True.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetCheckedItemsAndContainers(TreeView, Boolean)

Get the sequence of items and containers with their IsChecked property set to True.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetCheckedItemsAndContainers(this TreeView view, bool includeIndeterminate)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Boolean	includeIndeterminate	A value indicating whether to include TreeViewItems with an indeterminate IsChecked value.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	The sequence of items and containers with their IsChecked property set to True or also set to null if indeterminate values are included.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetContainerFromItem(TreeView, Object)

Get the TreeViewItem already created that is used to represent the given item.

Declaration

public static TreeViewItem GetContainerFromItem(this TreeView view, object item)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Object	item	The item being represented.

Returns

Type	Description
TreeViewItem	The TreeViewItems that represents the given item, or null if no container was found.

Remarks

If multiple TreeViewItems represent the same item, the first item found via a breadth-first search will be used.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetContainers(TreeView)

Get the TreeViewItem containers of a TreeView.

Declaration

public static IEnumerable<TreeViewItem> GetContainers(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Returns

Type	Description
System.Collections.Generic.IEnumerable<TreeViewItem>	The TreeViewItem containers of a TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetContainers(TreeViewItem)

Get the child TreeViewItem containers of a TreeViewItem.

Declaration

public static IEnumerable<TreeViewItem> GetContainers(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Collections.Generic.IEnumerable<TreeViewItem>	The child TreeViewItem containers of a TreeViewItem.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetContainersFromItem(TreeView, Object)

Get the TreeViewItems already created that are used to represent the given item.

Declaration

public static IEnumerable<TreeViewItem> GetContainersFromItem(this TreeView view, object item)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Object	item	The item being represented.

Returns

Type	Description
System.Collections.Generic.IEnumerable<TreeViewItem>	A sequence of TreeViewItems that represent the given item, or an empty sequence if none were found.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetDepth(TreeViewItem)

Gets the depth of a TreeViewItem in its TreeView (using a zero-based index).

Declaration

public static int GetDepth(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Int32	The depth of a TreeViewItem in its TreeView (using a zero-based index).

Exceptions

Type	Condition
System.ArgumentNullException	item is null.
System.ArgumentException	item is not in a TreeView.

GetDescendantContainers(TreeView)

Get the TreeViewItem containers of a TreeView.

Declaration

public static IEnumerable<TreeViewItem> GetDescendantContainers(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Returns

Type	Description
System.Collections.Generic.IEnumerable<TreeViewItem>	The TreeViewItem containers of a TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetDescendantContainers(TreeViewItem)

Get the descendant TreeViewItem containers of a TreeViewItem.

Declaration

public static IEnumerable<TreeViewItem> GetDescendantContainers(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Collections.Generic.IEnumerable<TreeViewItem>	The descendant TreeViewItem containers of a TreeViewItem.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetDescendantItemsAndContainers(TreeView)

Get the descendant items and TreeViewItem containers of a TreeView.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetDescendantItemsAndContainers(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	The descendant items and TreeViewItem containers of a TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetDescendantItemsAndContainers(TreeViewItem)

Get the descendant items and TreeViewItem containers of a TreeViewItem.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetDescendantItemsAndContainers(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	The descendant items and TreeViewItem containers of a TreeViewItem.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetIsChecked(TreeViewItem)

Gets the value of the IsChecked attached property for a specified TreeViewItem.

Declaration

public static bool? GetIsChecked(this TreeViewItem element)

Parameters

Type	Name	Description
TreeViewItem	element	The TreeViewItem from which the property value is read.

Returns

Type	Description
System.Nullable<System.Boolean>	The IsChecked property value for the TreeViewItem.

GetIsLeaf(TreeViewItem)

Gets a value indicating whether the TreeViewItem is a leaf in its TreeView.

Declaration

public static bool GetIsLeaf(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Boolean	A value indicating whether the TreeViewItem is a leaf in its TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetIsRoot(TreeViewItem)

Gets a value indicating whether the TreeViewItem is a root of its TreeView.

Declaration

public static bool GetIsRoot(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Boolean	A value indicating whether the TreeViewItem is a root of its TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetItem(TreeViewItem)

Get the item wrapped by this container.

Declaration

public static object GetItem(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Object	The item wrapped by the container, or null if not found.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetItemsAndContainers(TreeView)

Get the items and TreeViewItem containers of a TreeView.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetItemsAndContainers(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	The items and TreeViewItem containers of a TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetItemsAndContainers(TreeViewItem)

Get the items and TreeViewItem containers of a TreeViewItem.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetItemsAndContainers(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	The items and TreeViewItem containers of a TreeViewItem.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetParentItem(TreeView, Object)

Get the item of the parent container for a specified item.

Declaration

public static object GetParentItem(this TreeView view, object item)

Parameters

Type	Name	Description
TreeView	view	The TreeView containing the item.
System.Object	item	The child item.

Returns

Type	Description
System.Object	The item of the parent container for the specified item, or null if not found.

GetParentTreeView(TreeViewItem)

Get the parent TreeView of a TreeViewItem.

Declaration

public static TreeView GetParentTreeView(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
TreeView	The parent TreeView if found, otherwise null.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetParentTreeViewItem(TreeViewItem)

Get the parent TreeViewItem of a TreeViewItem.

Declaration

public static TreeViewItem GetParentTreeViewItem(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
TreeViewItem	The parent TreeViewItem if found, otherwise null.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetPath(TreeViewItem)

Gets a path of items and TreeViewItem containers from the TreeViewItem to the root of the TreeView.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetPath(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	A path of items and TreeViewItem containers from the TreeViewItem to the root of the TreeView.

Exceptions

Type	Condition
System.ArgumentNullException	item is null.

GetSelectedContainer(TreeView)

Get the selected TreeViewItem in a TreeView.

Declaration

public static TreeViewItem GetSelectedContainer(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Returns

Type	Description
TreeViewItem	The selected TreeViewItem, or null if no selected item found.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetSelectedPath(TreeView)

Gets the path to the TreeView's selected item.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetSelectedPath(this TreeView view)

Parameters

Type	Name	Description
TreeView	view	The TreeView.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	The path to the TreeView's selected item.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

GetSiblingItemsAndContainers(TreeViewItem)

Get the sibling items and containers of the item.

Declaration

public static IEnumerable<KeyValuePair<object, TreeViewItem>> GetSiblingItemsAndContainers(this TreeViewItem item)

Parameters

Type	Name	Description
TreeViewItem	item	The TreeViewItem.

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.Object, TreeViewItem>>	The sibling items and containers of the item.

SelectItem(TreeView, Object)

Select an item in the TreeView.

Declaration

public static bool SelectItem(this TreeView view, object item)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
System.Object	item	The item to select.

Returns

Type	Description
System.Boolean	A value indicating whether the item was successfully set as the TreeView's SelectedItem.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.

SetIsChecked(TreeViewItem, Nullable<Boolean>)

Sets the value of the IsChecked attached property to a specified TreeViewItem.

Declaration

public static void SetIsChecked(this TreeViewItem element, bool? value)

Parameters

Type	Name	Description
TreeViewItem	element	The TreeViewItem to which the attached property is written.
System.Nullable<System.Boolean>	value	The needed IsChecked value.

SetSelectedContainer(TreeView, TreeViewItem)

Sets the selected TreeViewItem of a TreeView.

Declaration

public static void SetSelectedContainer(this TreeView view, TreeViewItem item)

Parameters

Type	Name	Description
TreeView	view	The TreeView.
TreeViewItem	item	The TreeViewItem to select.

Exceptions

Type	Condition
System.ArgumentNullException	view is null.