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TreeWalker.GetNextSibling Method

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Definition

Namespace:
System.Windows.Automation
Assembly:
UIAutomationClient.dll

Retrieves the next sibling element of the specified AutomationElement.

Overloads

GetNextSibling(AutomationElement, CacheRequest)

Retrieves the next sibling element of the specified AutomationElement and caches properties and patterns.
GetNextSibling(AutomationElement)

Retrieves the next sibling element of the specified AutomationElement.

Remarks

An AutomationElement can have additional sibling elements that do not match the current view condition and thus are not returned when navigating the element tree.

The structure of the AutomationElement tree changes as the visible user interface (UI) elements on the desktop change. It is not guaranteed that an element returned as the next sibling element will be returned as the next sibling on subsequent passes.

GetNextSibling(AutomationElement, CacheRequest)

Retrieves the next sibling element of the specified AutomationElement and caches properties and patterns.

public:
 System::Windows::Automation::AutomationElement ^ GetNextSibling(System::Windows::Automation::AutomationElement ^ element, System::Windows::Automation::CacheRequest ^ request);
public System.Windows.Automation.AutomationElement GetNextSibling (System.Windows.Automation.AutomationElement element, System.Windows.Automation.CacheRequest request);
member this.GetNextSibling : System.Windows.Automation.AutomationElement * System.Windows.Automation.CacheRequest -> System.Windows.Automation.AutomationElement
Public Function GetNextSibling (element As AutomationElement, request As CacheRequest) As AutomationElement

Parameters

element
AutomationElement

The element from which to retrieve the next sibling.

request
CacheRequest

A cache request object specifying properties and patterns on the returned AutomationElement to cache.

Returns

AutomationElement

The next sibling element, or a null reference (Nothing in Visual Basic) if there is no such element.

Remarks

An AutomationElement can have additional sibling elements that do not match the current view condition and thus are not returned when navigating the element tree.

The structure of the AutomationElement tree changes as the visible user interface (UI) elements on the desktop change. It is not guaranteed that an element returned as the next sibling element will be returned as the next sibling on subsequent passes.

See also

Applies to

GetNextSibling(AutomationElement)

Retrieves the next sibling element of the specified AutomationElement.

public:
 System::Windows::Automation::AutomationElement ^ GetNextSibling(System::Windows::Automation::AutomationElement ^ element);
public System.Windows.Automation.AutomationElement GetNextSibling (System.Windows.Automation.AutomationElement element);
member this.GetNextSibling : System.Windows.Automation.AutomationElement -> System.Windows.Automation.AutomationElement
Public Function GetNextSibling (element As AutomationElement) As AutomationElement

Parameters

element
AutomationElement

The AutomationElement from which to retrieve the next sibling.

Returns

AutomationElement

The next sibling element, or a null reference (Nothing in Visual Basic) if there is no such element.

Examples

The following example shows GetNextSibling being used to construct a tree view of elements in a subtree.

/// <summary>
/// Walks the UI Automation tree and adds the control type of each element it finds 
/// in the control view to a TreeView.
/// </summary>
/// <param name="rootElement">The root of the search on this iteration.</param>
/// <param name="treeNode">The node in the TreeView for this iteration.</param>
/// <remarks>
/// This is a recursive function that maps out the structure of the subtree beginning at the
/// UI Automation element passed in as rootElement on the first call. This could be, for example,
/// an application window.
/// CAUTION: Do not pass in AutomationElement.RootElement. Attempting to map out the entire subtree of
/// the desktop could take a very long time and even lead to a stack overflow.
/// </remarks>
private void WalkControlElements(AutomationElement rootElement, TreeNode treeNode)
{
    // Conditions for the basic views of the subtree (content, control, and raw) 
    // are available as fields of TreeWalker, and one of these is used in the 
    // following code.
    AutomationElement elementNode = TreeWalker.ControlViewWalker.GetFirstChild(rootElement);

    while (elementNode != null)
    {
        TreeNode childTreeNode = treeNode.Nodes.Add(elementNode.Current.ControlType.LocalizedControlType);
        WalkControlElements(elementNode, childTreeNode);
        elementNode = TreeWalker.ControlViewWalker.GetNextSibling(elementNode);
    }
}

''' <summary>
''' Walks the UI Automation tree and adds the control type of each element it finds 
''' in the control view to a TreeView.
''' </summary>
''' <param name="rootElement">The root of the search on this iteration.</param>
''' <param name="treeNode">The node in the TreeView for this iteration.</param>
''' <remarks>
''' This is a recursive function that maps out the structure of the subtree beginning at the
''' UI Automation element passed in as rootElement on the first call. This could be, for example,
''' an application window.
''' CAUTION: Do not pass in AutomationElement.RootElement. Attempting to map out the entire subtree of
''' the desktop could take a very long time and even lead to a stack overflow.
''' </remarks>
Private Sub WalkControlElements(ByVal rootElement As AutomationElement, ByVal treeNode As TreeNode)
    ' Conditions for the basic views of the subtree (content, control, and raw) 
    ' are available as fields of TreeWalker, and one of these is used in the 
    ' following code.
    Dim elementNode As AutomationElement = TreeWalker.ControlViewWalker.GetFirstChild(rootElement)

    While (elementNode IsNot Nothing)
        Dim childTreeNode As TreeNode = treeNode.Nodes.Add(elementNode.Current.ControlType.LocalizedControlType)
        WalkControlElements(elementNode, childTreeNode)
        elementNode = TreeWalker.ControlViewWalker.GetNextSibling(elementNode)
    End While

End Sub

Remarks

An AutomationElement can have additional sibling elements that do not match the current view condition and thus are not returned when navigating the element tree.

The structure of the AutomationElement tree changes as the visible user interface (UI) elements on the desktop change. It is not guaranteed that an element returned as the next sibling element will be returned as the next sibling on subsequent passes.

See also

Applies to