Insert PDF into OneNote using C# | PDF in OneNote C#

PDF-in-OneNote-CSharp.md

Learn how to insert PDF into a OneNote as an attachment using C# : https://blog.aspose.com/note/insert-pdf-into-onenote-using-csharp/

The following topics are covered in this article:

1. C# API to Insert PDF into OneNote
2. Insert PDF into New OneNote Document
3. Insert PDF into Existing OneNote Document

PDF-in-OneNote-CSharp_InsertInExisting.cs

// Load an existing OneNote document
Document doc = new Document("C:\\Files\\Sample1.one");

// Initialize Page class object
Page page = new Page();

// Initialize Outline class object
Outline outline = new Outline();

// Initialize OutlineElement class object
OutlineElement outlineElem = new OutlineElement();

// Input PDF file to insert
var stream = File.OpenRead("C:\\Files\\companies.pdf");

// PDF file icon to insert
var iconStream = File.OpenRead("C:\\Files\\PDF_Icon.png");

// Initialize AttachedFile class object and also pass its icon path
//AttachedFile attachedFile = new AttachedFile("companies.pdf", stream);
AttachedFile attachedFile = new AttachedFile("companies.pdf", stream, iconStream, ImageFormat.Png);

// Add attached file
outlineElem.AppendChildLast(attachedFile);

// Add outline element node
outline.AppendChildLast(outlineElem);

// Add outline node
page.AppendChildLast(outline);

// Add page node
doc.AppendChildLast(page);

// Save the Document
doc.Save("C:\\Files\\Sample1_out.one");

PDF-in-OneNote-CSharp_InsertInNew.cs

// Create an object of the Document class
Document doc = new Document();

// Initialize Page class object
Page page = new Page();

// Initialize Outline class object
Outline outline = new Outline();

// Initialize OutlineElement class object
OutlineElement outlineElem = new OutlineElement();

// Input PDF file to insert
var stream = File.OpenRead("C:\\Files\\companies.pdf");

// PDF file icon to insert
var iconStream = File.OpenRead("C:\\Files\\PDF_Icon.png");

// Initialize AttachedFile class object and also pass its icon path
//AttachedFile attachedFile = new AttachedFile("companies.pdf", stream);
AttachedFile attachedFile = new AttachedFile("companies.pdf", stream, iconStream, ImageFormat.Png);

// Add attached file
outlineElem.AppendChildLast(attachedFile);

// Add outline element node
outline.AppendChildLast(outlineElem);

// Add outline node
page.AppendChildLast(outline);

// Add page node
doc.AppendChildLast(page);

// Save the Document
doc.Save("C:\\Files\\AttachFileAndSetIcon_out.one");