打印WPF FlowDocument

Question

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

我正在使用的代码如下：

        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，现在我使用的是默认打印机，而不是允许用户指定打印选项。它工作正常，除了在文档打印后，屏幕上显示的FlowDocument已更改为使用我指定的设置进行打印。

我可以通过在打印后手动重置所有内容来解决这个问题，但这是最好的方法吗？我打印之前是否应该复制FlowDocument？或者我应该考虑另一种方法吗？

Answer 1

是的，在打印之前制作FlowDocument的副本。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 2

您可以使用以下URL中的代码，它将流文档包装在固定文档中并打印出来，最大的好处是您可以使用它来添加页边距，页眉和页脚。

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

Answer 3

以下适用于文字和非文字视觉效果：

//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");
}

Answer 4

我也在Flow文档中生成WPF报告，但我故意将流文档用作打印预览屏幕。我希望边距是一样的。您可以阅读how I did this here。

在您的场景中，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为原始状态，则可以重新应用设置。