打印 WPF FlowDocument

Question

我正在 WPF 中构建一个演示应用程序，这对我来说是新的。我目前正在 FlowDocument 中显示文本，需要打印它。

我使用的代码如下所示：

        PrintDialog pd = new PrintDialog();
        fd.PageHeight = pd.PrintableAreaHeight;
        fd.PageWidth = pd.PrintableAreaWidth;
        fd.PagePadding = new Thickness(50);
        fd.ColumnGap = 0;
        fd.ColumnWidth = pd.PrintableAreaWidth;

        IDocumentPaginatorSource dps = fd;
        pd.PrintDocument(dps.DocumentPaginator, "flow doc");

fd 是我的 FlowDocument，现在我使用默认打印机而不是允许用户指定打印选项。它工作正常，除了文档打印后，屏幕上显示的 FlowDocument 已更改为使用我指定的打印设置。

我可以通过在打印后手动重置所有内容来解决此问题，但这是最好的方法吗？我应该在打印之前复制 FlowDocument 吗？还是我应该考虑另一种方法？

Answer 1

您可以使用下面 URL 中的代码，它将流文档包装在一个固定文档中并打印出来，最大的优点是您可以使用它来添加边距、页眉和页脚。

https://web.archive.org/web/20150502085246/http://blogs.msdn.com:80/b/fyuan/archive/2007/03/10/convert-xaml-flow-document-to-xps-with-style-multiple-page-page-size-header-margin.aspx

Answer 2

是的，在打印之前复制 FlowDocument。这是因为分页和边距会有所不同。这对我有用。

    private void DoThePrint(System.Windows.Documents.FlowDocument document)
    {
        // Clone the source document's content into a new FlowDocument.
        // This is because the pagination for the printer needs to be
        // done differently than the pagination for the displayed page.
        // We print the copy, rather that the original FlowDocument.
        System.IO.MemoryStream s = new System.IO.MemoryStream();
        TextRange source = new TextRange(document.ContentStart, document.ContentEnd);
        source.Save(s, DataFormats.Xaml);
        FlowDocument copy = new FlowDocument();
        TextRange dest = new TextRange(copy.ContentStart, copy.ContentEnd);
        dest.Load(s, DataFormats.Xaml);

        // Create a XpsDocumentWriter object, implicitly opening a Windows common print dialog,
        // and allowing the user to select a printer.

        // get information about the dimensions of the seleted printer+media.
        System.Printing.PrintDocumentImageableArea ia = null;
        System.Windows.Xps.XpsDocumentWriter docWriter = System.Printing.PrintQueue.CreateXpsDocumentWriter(ref ia);

        if (docWriter != null && ia != null)
        {
            DocumentPaginator paginator = ((IDocumentPaginatorSource)copy).DocumentPaginator;

            // Change the PageSize and PagePadding for the document to match the CanvasSize for the printer device.
            paginator.PageSize = new Size(ia.MediaSizeWidth, ia.MediaSizeHeight);
            Thickness t = new Thickness(72);  // copy.PagePadding;
            copy.PagePadding = new Thickness(
                             Math.Max(ia.OriginWidth, t.Left),
                               Math.Max(ia.OriginHeight, t.Top),
                               Math.Max(ia.MediaSizeWidth - (ia.OriginWidth + ia.ExtentWidth), t.Right),
                               Math.Max(ia.MediaSizeHeight - (ia.OriginHeight + ia.ExtentHeight), t.Bottom));

            copy.ColumnWidth = double.PositiveInfinity;
            //copy.PageWidth = 528; // allow the page to be the natural with of the output device

            // Send content to the printer.
            docWriter.Write(paginator);
        }

    }

Answer 3

我还从 Flow 文档中生成 WPF 报告，但我特意将 Flow 文档用作打印预览屏幕。我在那里希望边距相同。你可以阅读how I did this here。

在您的情况下，我在想为什么不只是复制您的设置，而不是整个流程文档。如果您希望将文档恢复到原始状态，则可以重新应用设置。

Answer 4

以下内容适用于文本和非文本视觉效果：

//Clone the source document
var str = XamlWriter.Save(FlowDoc);
var stringReader = new System.IO.StringReader(str);
var xmlReader = XmlReader.Create(stringReader);
var CloneDoc = XamlReader.Load(xmlReader) as FlowDocument;

//Now print using PrintDialog
var pd = new PrintDialog();

if (pd.ShowDialog().Value)
{
  CloneDoc.PageHeight = pd.PrintableAreaHeight;
  CloneDoc.PageWidth = pd.PrintableAreaWidth;
  IDocumentPaginatorSource idocument = CloneDoc as IDocumentPaginatorSource;

  pd.PrintDocument(idocument.DocumentPaginator, "Printing FlowDocument");
}