C# WPF打印画布以适合页面

我正试图在

PrintDialog

的帮助下将画布打印到打印机和文件上。我希望画布适合这一页。我能够使用以下代码实现它

private void Print(Visual v)
{

    System.Windows.FrameworkElement e = v as System.Windows.FrameworkElement ;
    if (e == null)
        return;

    PrintDialog pd = new PrintDialog();
    if (pd.ShowDialog() == true)
    {
        //store original scale
        Transform originalScale = e.LayoutTransform;
        //get selected printer capabilities
        System.Printing.PrintCapabilities capabilities = pd.PrintQueue.GetPrintCapabilities(pd.PrintTicket);

        //get scale of the print wrt to screen of WPF visual
        double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / e.ActualWidth, capabilities.PageImageableArea.ExtentHeight /
                       e.ActualHeight);

        //Transform the Visual to scale
        e.LayoutTransform = new ScaleTransform(scale, scale);

        //get the size of the printer page
        System.Windows.Size sz = new System.Windows.Size(capabilities.PageImageableArea.ExtentWidth, capabilities.PageImageableArea.ExtentHeight);

        //update the layout of the visual to the printer page size.
        e.Measure(sz);
        e.Arrange(new System.Windows.Rect(new System.Windows.Point(capabilities.PageImageableArea.OriginWidth, capabilities.PageImageableArea.OriginHeight), sz));

        //now print the visual to printer to fit on the one page.
        pd.PrintVisual(v, "My Print");

        //apply the original transform.
        e.LayoutTransform = originalScale;
    }
}

上面的代码似乎按预期工作，但当我使用PDF writer将其写入PDF文件时，画布将在显示“保存”对话框时调整大小，并将其设置回正常状态。因此，UI中也出现了调整大小的情况

此画布已经是克隆的画布，如果不在UI中显示，则无法打印此画布，因为会发生一些后台操作来填充画布中的元素，只有在加载后才能启动这些操作。因此，克隆的画布显示为打印预览

是否有人知道一个好的解决方案，或者在现有解决方案的基础上进行改进以解决UI大小调整问题