ExpandCollapsePattern.ExpandCollapseStateProperty 字段

定义

命名空间:

System.Windows.Automation

程序集:

UIAutomationClient.dll

标识 ExpandCollapseState 属性。

public: static initonly System::Windows::Automation::AutomationProperty ^ ExpandCollapseStateProperty;

public static readonly System.Windows.Automation.AutomationProperty ExpandCollapseStateProperty;

 staticval mutable ExpandCollapseStateProperty : System.Windows.Automation.AutomationProperty

Public Shared ReadOnly ExpandCollapseStateProperty As AutomationProperty 

字段值

AutomationProperty

示例

在以下示例中，根元素传递给一个函数，该函数返回 UI 自动化元素的集合，这些元素是根的子代并满足一组属性条件。

///--------------------------------------------------------------------
/// <summary>
/// Finds all automation elements that satisfy 
/// the specified condition(s).
/// </summary>
/// <param name="targetApp">
/// The automation element from which to start searching.
/// </param>
/// <returns>
/// A collection of automation elements satisfying 
/// the specified condition(s).
/// </returns>
///--------------------------------------------------------------------
private AutomationElementCollection FindAutomationElement(
    AutomationElement targetApp)
{
    if (targetApp == null)
    {
        throw new ArgumentException("Root element cannot be null.");
    }

    PropertyCondition conditionLeafNode =
        new PropertyCondition(
        ExpandCollapsePattern.ExpandCollapseStateProperty, 
        ExpandCollapseState.LeafNode);

    return targetApp.FindAll(
        TreeScope.Descendants, conditionLeafNode);
}

'''--------------------------------------------------------------------
''' <summary>
''' Finds all automation elements that satisfy 
''' the specified condition(s).
''' </summary>
''' <param name="targetApp">
''' The automation element from which to start searching.
''' </param>
''' <returns>
''' A collection of automation elements satisfying 
''' the specified condition(s).
''' </returns>
'''--------------------------------------------------------------------
Private Function FindAutomationElement( _
ByVal targetApp As AutomationElement) As AutomationElementCollection
    If targetApp Is Nothing Then
        Throw New ArgumentException("Root element cannot be null.")
    End If

    Dim conditionLeafNode As New PropertyCondition( _
    ExpandCollapsePattern.ExpandCollapseStateProperty, _
    ExpandCollapseState.LeafNode)

    Return targetApp.FindAll(TreeScope.Descendants, conditionLeafNode)

End Function 'FindAutomationElement

注解

UI 自动化客户端应用程序使用此标识符。 UI 自动化提供程序应使用 中的 ExpandCollapsePatternIdentifiers等效字段。

ExpandCollapseState 仅表示直接子对象的可见性，而不表示所有后代对象的可见性。

默认值是 Expanded。

另请参阅

• InvokePattern 和 ExpandCollapsePattern 菜单项示例