通过

如何通过编程更改内容的 FlowDirection

此示例演示如何以编程方式更改 FlowDirection a FlowDocumentReader. 的属性。

创建按钮元素

将创建两 Button 个元素，每个元素表示其中一个可能的值 FlowDirection。 单击按钮时，关联的属性值将应用于名为FlowDocumentReader的内容tf1。 属性值也写入到名为txt1的TextBlock。

<StackPanel DockPanel.Dock="Top" Orientation="Horizontal" Margin="0,0,0,10">
  <Button Click="LR">LeftToRight</Button>
  <Button Click="RL">RightToLeft</Button>
</StackPanel>

<TextBlock Name="txt1" DockPanel.Dock="Bottom" Margin="0,50,0,0"/>

<FlowDocumentReader>
  <FlowDocument FontFamily="Arial" Name="tf1">
    <Paragraph>
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, 
    sed diam nonummy nibh euismod tincidunt ut laoreet dolore 
    magna aliquam erat volutpat.  Ut wisi enim ad minim veniam, 
    quis nostrud exerci tation ullamcorper suscipit lobortis nisl 
    ut aliquip ex ea commodo consequat. Duis autem vel eum iriure.
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    uliquip ex ea commodo consequat. Duis autem vel eum iriure. 
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    aliquip ex ea commodo consequat. Duis autem vel eum iriure.
    </Paragraph>
    <Paragraph>
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    aliquip ex ea commodo consequat. Duis autem vel eum iriure. 
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    aliquip ex ea commodo consequat. Duis autem vel eum iriure. 
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    aliquip ex ea commodo consequat. Duis autem vel eum iriure.
    </Paragraph>
  </FlowDocument>
</FlowDocumentReader>

C# 代码示例

与上面定义的按钮单击关联的事件在 C# 代码隐藏文件中进行处理。

private void LR(object sender, RoutedEventArgs e)
{
    tf1.FlowDirection = FlowDirection.LeftToRight;
    txt1.Text = "FlowDirection is now " + tf1.FlowDirection;
}
private void RL(object sender, RoutedEventArgs e)
{
    tf1.FlowDirection = FlowDirection.RightToLeft;
    txt1.Text = "FlowDirection is now " + tf1.FlowDirection;
}

Private Sub LR(ByVal sender As Object, ByVal e As RoutedEventArgs)
    tf1.FlowDirection = FlowDirection.LeftToRight
    txt1.Text = "FlowDirection is now " & tf1.FlowDirection
End Sub
Private Sub RL(ByVal sender As Object, ByVal e As RoutedEventArgs)
    tf1.FlowDirection = FlowDirection.RightToLeft
    txt1.Text = "FlowDirection is now " & tf1.FlowDirection
End Sub