TextPatternRange.FindAttribute 方法

定义

命名空间:

System.Windows.Automation.Text

程序集:

UIAutomationClient.dll

返回具有指定特性值的文本范围子集。

public:
 System::Windows::Automation::Text::TextPatternRange ^ FindAttribute(System::Windows::Automation::AutomationTextAttribute ^ attribute, System::Object ^ value, bool backward);

public System.Windows.Automation.Text.TextPatternRange FindAttribute (System.Windows.Automation.AutomationTextAttribute attribute, object value, bool backward);

member this.FindAttribute : System.Windows.Automation.AutomationTextAttribute * obj * bool -> System.Windows.Automation.Text.TextPatternRange

Public Function FindAttribute (attribute As AutomationTextAttribute, value As Object, backward As Boolean) As TextPatternRange

参数

attribute

AutomationTextAttribute

要搜索的特性。

value

Object

要搜索的特性值。 此值必须与为特性指定的类型匹配。

backward

Boolean

如果应该返回最后一个匹配的文本范围而不是第一个，则为 true；否则为 false。

返回

TextPatternRange

具有匹配特性和特性值的文本范围；否则为 null（在 Visual Basic 中为 Nothing）。

示例

 private TextPatternRange RangeFromAttribute(AutomationElement target)
{
    // Specify the control type we're looking for, in this case 'Document'
    PropertyCondition cond = new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Document);

    // target --> The root AutomationElement.
    AutomationElement textProvider = target.FindFirst(TreeScope.Descendants, cond);

    TextPattern textpatternPattern = textProvider.GetCurrentPattern(TextPattern.Pattern) as TextPattern;

    if (textpatternPattern == null)
    {
        Console.WriteLine("Root element does not contain a descendant that supports TextPattern.");
        return null;
    }
    TextPatternRange[] currentSelelction = textpatternPattern.GetSelection();
    // Find 'italic' range
    return currentSelelction[0].FindAttribute(TextPattern.IsItalicAttribute, true, false);
}

Private Function RangeFromAttribute(ByVal target As AutomationElement) As TextPatternRange
    ' Specify the control type we're looking for, in this case 'Document'
    Dim cond As PropertyCondition = New PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Document)

    ' target --> The root AutomationElement.
    Dim textProvider As AutomationElement = target.FindFirst(TreeScope.Descendants, cond)

    Dim textpatternPattern As TextPattern = CType(textProvider.GetCurrentPattern(TextPattern.Pattern), TextPattern)

    If (textpatternPattern Is Nothing) Then
        Console.WriteLine("Root element does not contain a descendant that supports TextPattern.")
        Return Nothing
    End If
    Dim currentSelection As TextPatternRange() = textpatternPattern.GetSelection()
    Return currentSelection(0).FindAttribute(TextPattern.IsItalicAttribute, True, False)
End Function

注解

隐藏文本和可见文本之间没有区别。 UI 自动化客户端可以使用 IsHiddenAttribute 检查文本可见性。

注意

使用 DocumentRange 搜索整个文档。

另请参阅

• TextPattern