Myujth

There is sample code on how to add multiple Pdf documents into one in the docs. But I want to combine multiple MigraDoc documents into one.

The code I have so far is:

 private void GeneratePdfDocument(IEnumerable<Document> parts, string fileName)
 
 using (var outputDocument = new PdfDocument())
 
 foreach (var part in parts)
 
 var renderer = new PdfDocumentRenderer(false, PdfFontEmbedding.Always);

 renderer.Document = part;

 renderer.RenderDocument();

 var pdfPart = renderer.PdfDocument;

 for (var pageIndex = 0; pageIndex < pdfPart.PageCount; pageIndex++)
 
 outputDocument.AddPage(pdfPart.Pages[pageIndex]);
 
 

 // create the PDF
 outputDocument.Save(fileName);
 
 

But on AddPage, I get an System.InvalidOperationException:

A PDF document must be opened with PdfDocumentOpenMode.Import to import pages from it.

A solution would be to create each Document part as separate PDF, then combine all of them into a single PDF file, but not all parts will require a whole page.

EDIT:
I tried also the following approach:

 var combineDocument = new Document();
 foreach (var part in parts)
 
 //for(var styleIndex = 0; styleIndex < part.Styles.Count; styleIndex++)
 //
 // combineDocument.Add(part.Styles[styleIndex]);
 //

 for(var sectionIndex = 0; sectionIndex < part.Sections.Count; sectionIndex++)
 
 var section = part.Sections[sectionIndex].Clone();
 combineDocument.Add(section);
 
 

The idea was to copy the sections of each Document into the combineDocument instance, but I was not able to retrieve the Style instances and the result was not as expected.

Question:
Is it possible to combine MigraDoc Document instances into one document?

To transfer elements of one MigraDoc Document into another, try the Clone() method of the element you want to transfer. This can also be used to re-use elements within the same document.

To do this, you have to iterate through all the document elements you want to copy and call Clone() for each and call Add for the receiving Document passing the cloned object as a parameter.

To work around the PDFsharp exception shown in the original question you could save the PdfDocument into a MemoryStream and open it again using PdfDocumentOpenMode.Import.

The solution I would prefer: Write methods that create MigraDoc Documents or their parts. Call those methods twice - once to create one big document, once to create several small documents. Thus you avoid cloning and saving/reading.