我正在 WPF 中构建一个演示应用程序,这对我来说是新的。我当前正在 FlowDocument 中显示文本,并且需要打印它。
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,只是在打印文档后,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?在打印 FlowDocument 之前是否应该复制一份?或者我应该考虑其他方法吗?
是的,在打印 FlowDocument 之前先复制一份。这是因为分页和页边距会有所不同。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);
}
}
您可以使用下面 URL 中的代码,它将流文档包装在固定文档中并打印,最大的优点是您可以使用它来添加边距、页眉和页脚。
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");
}
我还根据 Flow 文档生成 WPF 报告,但我特意使用 Flow 文档作为打印预览屏幕。我希望边距相同。您可以在这里阅读我是如何做到这一点的。
在您的场景中,我在想为什么不只复制您的设置,而不是整个流程文档。如果您希望将文档恢复到原始状态,您可以重新应用设置。