TreeWalker.GetNextSibling 方法

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

参数

返回

下一个同级元素；如果不存在此类元素，则为空引用（在 Visual Basic 中为 Nothing）。

注解

可以 AutomationElement 具有与当前视图条件不匹配的其他同级元素，因此在导航元素树时不会返回 。

树的结构 AutomationElement 会随着桌面上可见用户界面 (UI) 元素的更改而更改。 不能保证作为下一个同级元素返回的元素将在后续传递中作为下一个同级元素返回。

另请参阅

• UI 自动化树概述
• 使用 TreeWalker 在 UI 自动化元素之间导航
• 获取 UI 自动化元素

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

参数

返回

下一个同级元素；如果不存在此类元素，则为空引用（在 Visual Basic 中为 Nothing）。

示例

以下示例演示如何 GetNextSibling 用于构造子树中元素的树视图。

/// <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

注解

可以 AutomationElement 具有与当前视图条件不匹配的其他同级元素，因此在导航元素树时不会返回 。

树的结构 AutomationElement 会随着桌面上可见用户界面 (UI) 元素的更改而更改。 不能保证作为下一个同级元素返回的元素将在后续传递中作为下一个同级元素返回。

另请参阅

• UI 自动化树概述
• 使用 TreeWalker 在 UI 自动化元素之间导航
• 获取 UI 自动化元素