TextRange.ApplyPropertyValue(DependencyProperty, Object) Metoda

Definicja

Przestrzeń nazw:

System.Windows.Documents

Zestaw:

PresentationFramework.dll

Stosuje określoną właściwość formatowania i wartość do bieżącego zaznaczenia.

public:
 void ApplyPropertyValue(System::Windows::DependencyProperty ^ formattingProperty, System::Object ^ value);

public void ApplyPropertyValue (System.Windows.DependencyProperty formattingProperty, object value);

member this.ApplyPropertyValue : System.Windows.DependencyProperty * obj -> unit

Public Sub ApplyPropertyValue (formattingProperty As DependencyProperty, value As Object)

Parametry

formattingProperty

DependencyProperty

Właściwość formatowania do zastosowania.

value

Object

Wartość właściwości formatowania.

Wyjątki

ArgumentException

Występuje, gdy formattingProperty nie określa prawidłowej właściwości formatowania lub value określa nieprawidłową wartość dla formattingPropertyelementu .

ArgumentNullException

Występuje, gdy formattingProperty ma wartość null.

Przykłady

W poniższym przykładzie pokazano użycie ApplyPropertyValue metody .

// This method accepts an input stream and a corresponding data format.  The method
// will attempt to load the input stream into a TextRange selection, apply Bold formatting
// to the selection, save the reformatted selection to an alternat stream, and return 
// the reformatted stream.  
Stream BoldFormatStream(Stream inputStream, string dataFormat)
{
    // A text container to read the stream into.
    FlowDocument workDoc = new FlowDocument();
    TextRange selection = new TextRange(workDoc.ContentStart, workDoc.ContentEnd);
    Stream outputStream = new MemoryStream();

    try
    {
        // Check for a valid data format, and then attempt to load the input stream
        // into the current selection.  Note that CanLoad ONLY checks whether dataFormat
        // is a currently supported data format for loading a TextRange.  It does not 
        // verify that the stream actually contains the specified format.  An exception 
        // may be raised when there is a mismatch between the specified data format and 
        // the data in the stream. 
        if (selection.CanLoad(dataFormat))
            selection.Load(inputStream, dataFormat);
    }
    catch (Exception e) { return outputStream; /* Load failure; return a null stream. */ }

    // Apply Bold formatting to the selection, if it is not empty.
    if (!selection.IsEmpty)
        selection.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold);

    // Save the formatted selection to a stream, and return the stream.
    if (selection.CanSave(dataFormat))
        selection.Save(outputStream, dataFormat);

    return outputStream;
}

' This method accepts an input stream and a corresponding data format.  The method
' will attempt to load the input stream into a TextRange selection, apply Bold formatting
' to the selection, save the reformatted selection to an alternat stream, and return 
' the reformatted stream.  
Private Function BoldFormatStream(ByVal inputStream As Stream, ByVal dataFormat As String) As Stream
    ' A text container to read the stream into.
    Dim workDoc As New FlowDocument()
    Dim selection As New TextRange(workDoc.ContentStart, workDoc.ContentEnd)
    Dim outputStream As Stream = New MemoryStream()

    Try
        ' Check for a valid data format, and then attempt to load the input stream
        ' into the current selection.  Note that CanLoad ONLY checks whether dataFormat
        ' is a currently supported data format for loading a TextRange.  It does not 
        ' verify that the stream actually contains the specified format.  An exception 
        ' may be raised when there is a mismatch between the specified data format and 
        ' the data in the stream. 
        If selection.CanLoad(dataFormat) Then
            selection.Load(inputStream, dataFormat)
        End If
    Catch e As Exception ' Load failure return a null stream. 
        Return outputStream
    End Try

    ' Apply Bold formatting to the selection, if it is not empty.
    If Not selection.IsEmpty Then
        selection.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold)
    End If

    ' Save the formatted selection to a stream, and return the stream.
    If selection.CanSave(dataFormat) Then
        selection.Save(outputStream, dataFormat)
    End If

    Return outputStream
End Function

Uwagi

Ta metoda stosuje formatowanie, wstawiając odpowiednie Inline elementy, takie jak Bold i Italic, do zaznaczenia wskazanego przez ten TextRangeelement .

Zobacz też

• ClearAllProperties()
• GetPropertyValue(DependencyProperty)