根據屬性條件尋找 UI 自動化項目
.gif "注意事項") 注意事項 |
|---|
這份文件適用於想要使用 System.Windows.Automation 命名空間中定義之 Managed UI Automation 類別的 .NET Framework 開發人員。如需 UI Automation 的最新資訊，請參閱 Windows Automation API：使用者介面自動化 (英文)。 |
本主題內含範例程式碼，說明如何根據一個或多個特定屬性尋找 UI Automation樹狀目錄中的項目。
範例
在下列範例中，會指定一組可以識別 AutomationElement 樹狀目錄中一個或多個所需特定項目的屬性條件。 然後使用 FindAll 方法來搜尋所有相符項目，這個方法會加上一連串 AndCondition 布林運算以限制相符項目數目。
| 注意事項 |
|---|
從 RootElement 搜尋時，您應嘗試只取得直接子系。如果搜尋子代，可能會逐一查看數百，甚至數千個項目，因而造成堆疊溢位。如果您嘗試取得較低層級的特定項目，則應該從應用程式視窗或較低層級的容器開始搜尋。 |
'''--------------------------------------------------------------------
''' <summary>
''' Walks the UI Automation tree of the target and reports the control
''' type of each element it finds in the control view to the client.
''' </summary>
''' <param name="targetTreeViewElement">
''' The root of the search on this iteration.
''' </param>
''' <param name="treeviewIndex">
''' The TreeView index for this iteration.
''' </param>
''' <remarks>
''' This is a recursive function that maps out the structure of the
''' subtree beginning at the AutomationElement 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 FindTreeViewDescendants( _
ByVal targetTreeViewElement As AutomationElement, _
ByVal treeviewIndex As Integer)
If (IsNothing(targetTreeViewElement)) Then
Return
End If
Dim elementNode As AutomationElement = _
TreeWalker.ControlViewWalker.GetFirstChild(targetTreeViewElement)
While Not (elementNode Is Nothing)
Dim elementInfo As New Label()
elementInfo.Margin = New Thickness(0)
clientTreeViews(treeviewIndex).Children.Add(elementInfo)
' Compile information about the control.
elementInfoCompile = New StringBuilder()
Dim controlName As String
If (elementNode.Current.Name = "") Then
controlName = "Unnamed control"
Else
controlName = elementNode.Current.Name
End If
Dim autoIdName As String
If (elementNode.Current.AutomationId = "") Then
autoIdName = "No AutomationID"
Else
autoIdName = elementNode.Current.AutomationId
End If
elementInfoCompile.Append(controlName).Append(" (") _
.Append(elementNode.Current.ControlType.LocalizedControlType) _
.Append(" - ").Append(autoIdName).Append(")")
' Test for the control patterns of interest for this sample.
Dim objPattern As Object = Nothing
Dim expcolPattern As ExpandCollapsePattern
If True = elementNode.TryGetCurrentPattern(ExpandCollapsePattern.Pattern, objPattern) Then
expcolPattern = DirectCast(objPattern, ExpandCollapsePattern)
If expcolPattern.Current.ExpandCollapseState <> ExpandCollapseState.LeafNode Then
Dim expcolButton As New Button()
expcolButton.Margin = New Thickness(0, 0, 0, 5)
expcolButton.Height = 20
expcolButton.Width = 100
expcolButton.Content = "ExpandCollapse"
expcolButton.Tag = expcolPattern
AddHandler expcolButton.Click, AddressOf ExpandCollapse_Click
clientTreeViews(treeviewIndex).Children.Add(expcolButton)
End If
End If
Dim togPattern As TogglePattern
If True = elementNode.TryGetCurrentPattern(TogglePattern.Pattern, objPattern) Then
togPattern = DirectCast(objPattern, TogglePattern)
Dim togButton As New Button()
togButton.Margin = New Thickness(0, 0, 0, 5)
togButton.Height = 20
togButton.Width = 100
togButton.Content = "Toggle"
togButton.Tag = togPattern
AddHandler togButton.Click, AddressOf Toggle_Click
clientTreeViews(treeviewIndex).Children.Add(togButton)
End If
Dim invPattern As InvokePattern
If True = elementNode.TryGetCurrentPattern(InvokePattern.Pattern, objPattern) Then
invPattern = DirectCast(objPattern, InvokePattern)
Dim invButton As New Button()
invButton.Margin = New Thickness(0)
invButton.Height = 20
invButton.Width = 100
invButton.Content = "Invoke"
invButton.Tag = invPattern
AddHandler invButton.Click, AddressOf Invoke_Click
clientTreeViews(treeviewIndex).Children.Add(invButton)
End If
' Display compiled information about the control.
elementInfo.Content = elementInfoCompile
Dim sep As New Separator()
clientTreeViews(treeviewIndex).Children.Add(sep)
' Iterate to next element.
' elementNode - Current element.
' treeviewIndex - Index of parent TreeView.
FindTreeViewDescendants(elementNode, treeviewIndex)
elementNode = TreeWalker.ControlViewWalker.GetNextSibling(elementNode)
End While
End Sub 'FindTreeViewDescendants
///--------------------------------------------------------------------
/// <summary>
/// Walks the UI Automation tree of the target and reports the control
/// type of each element it finds in the control view to the client.
/// </summary>
/// <param name="targetTreeViewElement">
/// The root of the search on this iteration.
/// </param>
/// <param name="elementIndex">
/// The TreeView index for this iteration.
/// </param>
/// <remarks>
/// This is a recursive function that maps out the structure of the
/// subtree of the target beginning at the AutomationElement passed in
/// as the 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 FindTreeViewDescendants(
AutomationElement targetTreeViewElement, int treeviewIndex)
{
if (targetTreeViewElement == null)
return;
AutomationElement elementNode =
TreeWalker.ControlViewWalker.GetFirstChild(targetTreeViewElement);
while (elementNode != null)
{
Label elementInfo = new Label();
elementInfo.Margin = new Thickness(0);
clientTreeViews[treeviewIndex].Children.Add(elementInfo);
// Compile information about the control.
elementInfoCompile = new StringBuilder();
string controlName =
(elementNode.Current.Name == "") ?
"Unnamed control" : elementNode.Current.Name;
string autoIdName =
(elementNode.Current.AutomationId == "") ?
"No AutomationID" : elementNode.Current.AutomationId;
elementInfoCompile.Append(controlName)
.Append(" (")
.Append(elementNode.Current.ControlType.LocalizedControlType)
.Append(" - ")
.Append(autoIdName)
.Append(")");
// Test for the control patterns of interest for this sample.
object objPattern;
ExpandCollapsePattern expcolPattern;
if (true == elementNode.TryGetCurrentPattern(ExpandCollapsePattern.Pattern, out objPattern))
{
expcolPattern = objPattern as ExpandCollapsePattern;
if (expcolPattern.Current.ExpandCollapseState != ExpandCollapseState.LeafNode)
{
Button expcolButton = new Button();
expcolButton.Margin = new Thickness(0, 0, 0, 5);
expcolButton.Height = 20;
expcolButton.Width = 100;
expcolButton.Content = "ExpandCollapse";
expcolButton.Tag = expcolPattern;
expcolButton.Click +=
new RoutedEventHandler(ExpandCollapse_Click);
clientTreeViews[treeviewIndex].Children.Add(expcolButton);
}
}
TogglePattern togPattern;
if (true == elementNode.TryGetCurrentPattern(TogglePattern.Pattern, out objPattern))
{
togPattern = objPattern as TogglePattern;
Button togButton = new Button();
togButton.Margin = new Thickness(0, 0, 0, 5);
togButton.Height = 20;
togButton.Width = 100;
togButton.Content = "Toggle";
togButton.Tag = togPattern;
togButton.Click += new RoutedEventHandler(Toggle_Click);
clientTreeViews[treeviewIndex].Children.Add(togButton);
}
InvokePattern invPattern;
if (true == elementNode.TryGetCurrentPattern(InvokePattern.Pattern, out objPattern))
{
invPattern = objPattern as InvokePattern;
Button invButton = new Button();
invButton.Margin = new Thickness(0);
invButton.Height = 20;
invButton.Width = 100;
invButton.Content = "Invoke";
invButton.Tag = invPattern;
invButton.Click += new RoutedEventHandler(Invoke_Click);
clientTreeViews[treeviewIndex].Children.Add(invButton);
}
// Display compiled information about the control.
elementInfo.Content = elementInfoCompile;
Separator sep = new Separator();
clientTreeViews[treeviewIndex].Children.Add(sep);
// Iterate to next element.
// elementNode - Current element.
// treeviewIndex - Index of parent TreeView.
FindTreeViewDescendants(elementNode, treeviewIndex);
elementNode =
TreeWalker.ControlViewWalker.GetNextSibling(elementNode);
}
}
請參閱
工作
InvokePattern, ExpandCollapsePattern, and TogglePattern Sample