C# 从 MemoryStream 打开 Office 文档和 Xps 文件

Question

I have an application for viewing Word and Excel Files via Xps Viewer. I convert office files to xps files and show it in WPF XPS Document Viewer.

But here is a little problem; I don't want the users see the files, i delete the files after closing.

I am wondering is there any solution to convert xps in to memory stream and view it in Xps Viewer

Edit:

I don't want create any xps file on disk. The convert process must done inside to MemoryStream.

Answer 1

Following lines of code worked fine for me on a poc project and can give you a starting point. For the document conversion part (word/excel -> xps) you could just print them via automation using XPS Document Writer.

System.IO.Stream docStream = ...any xps as stream;
Package package = Package.Open(docStream);

//Create URI for Xps Package
//Any Uri will actually be fine here. It acts as a place holder for the
//Uri of the package inside of the PackageStore
string inMemoryPackageName = string.Format("memorystream://{0}.xps", Guid.NewGuid());
Uri packageUri = new Uri(inMemoryPackageName);

//Add package to PackageStore
PackageStore.AddPackage(packageUri, package);

XpsDocument xpsDoc = new XpsDocument(package, CompressionOption.Maximum, inMemoryPackageName);
FixedDocumentSequence fixedDocumentSequence = xpsDoc.GetFixedDocumentSequence();

// Do operations on xpsDoc here
DocViewer.Document = fixedDocumentSequence;

//Note: Please note that you must keep the Package object in PackageStore until you
//are completely done with it since certain operations on XpsDocument can trigger
//delayed resource loading from the package.

//PackageStore.RemovePackage(packageUri);
//xpsDoc.Close();

Answer 2

please show some code...

If your XPS document is written into a stream you could pass that stream to Package.Open then the Package to XpsDocument then the Xpsdocument to DocumentViewer ... this way the xps stays in memory all the time.

For example Aspose.Words/.Cells can generate XPS from word and Excel into a stream - so no files involved...