Converting FlowDocument to XPS messes up page contents-CodePudding

I am trying to convert a FlowDocument to XPS. Here is how the FlowDocument is defined:

<FlowDocument PageHeight="29.7cm" PageWidth="21cm" PagePadding="2cm,2cm,2cm,2cm">
                    
</FlowDocument>

It is inside a RichTextBox and is populated by a user. It is saved as a .rtf file (.xamlgave me the same results). Here is the method I am using to save the doc:

public void UploadTemplate(TextRange content, string filename)
{
   string destPath = Path.Combine(default_template_path, filename   ".rtf");

   if (content.CanSave(DataFormats.Rtf))
   {
      using (var stream = new FileStream(destPath, FileMode.Create))
      {
         content.Save(stream, DataFormats.Rtf);
         stream.Close();
      }
   }    
}

And here is how I load the doc:

public void LoadTemplate(string template_path, TextRange content)
{
   if (content.CanLoad(DataFormats.Rtf))
   {
      using (var stream = new FileStream(template_path, FileMode.Open))
      {
         content.Load(stream, DataFormats.Rtf);
         stream.Close();
      }
   }
}

Finally this is the code I use for converting the FlowDocument to XPS:

public static MemoryStream FlowDocumentToXPS(FlowDocument flowDocument)
{
   MemoryStream stream = new MemoryStream();
   using (Package package = Package.Open(stream, FileMode.Create, FileAccess.ReadWrite))
   {
      using (XpsDocument xpsDoc = new XpsDocument(package, CompressionOption.Maximum))
      {
         XpsSerializationManager rsm = new XpsSerializationManager(new XpsPackagingPolicy(xpsDoc), false);
         DocumentPaginator paginator = ((IDocumentPaginatorSource)flowDocument).DocumentPaginator;
         paginator.PageSize = new Size(flowDocument.PageWidth, flowDocument.PageHeight);
         rsm.SaveAsXaml(paginator);
         rsm.Commit();
       }
   }
   stream.Position = 0;
   Console.WriteLine(stream.Length);
   Console.WriteLine(stream.Position);
   return stream;
}

After saving this stream to a .xps file the document pages seem like they are divided in 2 columns. This is what I get from that export. Can someone help me figure this out ?

CodePudding user response：

For anyone that might stumble upon this. You must set the FlowDocument.ColumnWidth property when converting to XPS. In this case it would need to be something like this:

public static MemoryStream FlowDocumentToXPS(FlowDocument flowDocument)
{
   flowDocument.ColumnWidth = (int)YourColumnWidth; // THIS IS THE KEY LINE

   MemoryStream stream = new MemoryStream();
   using (Package package = Package.Open(stream, FileMode.Create, FileAccess.ReadWrite))
   {
      using (XpsDocument xpsDoc = new XpsDocument(package, CompressionOption.Maximum))
      {
         XpsSerializationManager rsm = new XpsSerializationManager(new XpsPackagingPolicy(xpsDoc), false);
         DocumentPaginator paginator = ((IDocumentPaginatorSource)flowDocument).DocumentPaginator;
         paginator.PageSize = new Size(flowDocument.PageWidth, flowDocument.PageHeight);
         rsm.SaveAsXaml(paginator);
         rsm.Commit();
       }
   }
   stream.Position = 0;
   Console.WriteLine(stream.Length);
   Console.WriteLine(stream.Position);
   return stream;
}