WPF DocumentViewer - Print with no confirmation

I have a WPF application where I use a document viewer. I also start printing p开发者_运维问答rogrammatically with documentviewer.Print(); However, when that is pressed it brings up the screen with the Windows printers and makes the user have to click "OK" again on that screen to start. Is there a way to avoid the confirmation and make documentviewer.Print(); immediately start the print job on the default Windows printer?

All you need is the default print queue, which you can get via

var pq = LocalPrintServer.GetDefaultPrintQueue()

From this, you can create an XpsDocumentWriter:

var writer = PrintQueue.CreateXpsDocumentWriter(pq);

Now, you can get the DocumentPaginator from your DocumentViewer via the Document property, which returns an IDocumentPaginatorSource that has a DocumentPaginator property:

var paginator = documentviewer.Document.DocumentPaginator;

and you can send that right to the XpsDocumentWriter's Write method:

writer.Write(paginator);

Simple, isn't it?