TextPatternRange.GetAttributeValue(AutomationTextAttribute) Metode

Definisi

Ruang nama:

System.Windows.Automation.Text

Rakitan:

UIAutomationClient.dll

Mengembalikan nilai atribut yang ditentukan di seluruh rentang teks.

public:
 System::Object ^ GetAttributeValue(System::Windows::Automation::AutomationTextAttribute ^ attribute);

public object GetAttributeValue (System.Windows.Automation.AutomationTextAttribute attribute);

member this.GetAttributeValue : System.Windows.Automation.AutomationTextAttribute -> obj

Public Function GetAttributeValue (attribute As AutomationTextAttribute) As Object

Parameter

attribute

AutomationTextAttribute

Atribut teks.

Mengembalikan

Object

Mengembalikan nilai atribut yang ditentukan. Misalnya, GetAttributeValue(TextPattern.FontNameAttribute) akan mengembalikan string yang mewakili nama font, jika unik, dari rentang teks sementara GetAttributeValue(TextPattern.IsItalicAttribute) akan mengembalikan boolean.

Mengembalikan MixedAttributeValue jika nilai atribut yang ditentukan bervariasi di atas rentang teks.

Mengembalikan NotSupported jika atribut yang ditentukan tidak didukung oleh penyedia atau kontrol.

Pengecualian

ArgumentException

Jika atribut yang ditentukan tidak valid.

Contoh

 private Object AttributeValueFromSelection(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[] currentSelection = textpatternPattern.GetSelection();
    // Is 'italic'?
    return currentSelection[0].GetAttributeValue(TextPattern.IsItalicAttribute);
}

Private Function AttributeValueFromSelection(ByVal target As AutomationElement) As Object
    ' 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()
    ' Is 'italic'?
    Return currentSelection(0).GetAttributeValue(TextPattern.IsItalicAttribute)
End Function

Keterangan

Tidak ada diferensiasi antara teks tersembunyi dan terlihat. Klien Automation UI dapat menggunakan IsHiddenAttribute untuk memeriksa visibilitas teks.