// Adds a comment to the first slide of the presentation document.
// The presentation document must contain at least one slide.
private static void AddCommentToPresentation(string file, string initials, string name, string text)
{
using (PresentationDocument doc = PresentationDocument.Open(file, true))
{
// Declare a CommentAuthorsPart object.
CommentAuthorsPart authorsPart;
// Verify that there is an existing comment authors part.
if (doc.PresentationPart.CommentAuthorsPart == null)
{
// If not, add a new one.
authorsPart = doc.PresentationPart.AddNewPart <CommentAuthorsPart>();
}
else
{
authorsPart = doc.PresentationPart.CommentAuthorsPart;
}
// Verify that there is a comment author list in the comment authors part.
if (authorsPart.CommentAuthorList == null)
{
// If not, add a new one.
authorsPart.CommentAuthorList = new CommentAuthorList();
}
// Declare a new author ID.
uint authorId = 0;
CommentAuthor author = null;
// If there are existing child elements in the comment authors list...
if (authorsPart.CommentAuthorList.HasChildren)
{
// Verify that the author passed in is on the list.
var authors = authorsPart.CommentAuthorList.Elements <CommentAuthor>().Where(a => a.Name == name && a.Initials == initials);
// If so...
if (authors.Any())
{
// Assign the new comment author the existing author ID.
author = authors.First();
authorId = author.Id;
}
// If not...
if (author == null)
{
// Assign the author passed in a new ID
authorId = authorsPart.CommentAuthorList.Elements <CommentAuthor>().Select(a => a.Id.Value).Max();
}
}
// If there are no existing child elements in the comment authors list.
if (author == null)
{
authorId++;
// Add a new child element(comment author) to the comment author list.
author = authorsPart.CommentAuthorList.AppendChild <CommentAuthor>
(new CommentAuthor()
{
Id = authorId,
Name = name,
Initials = initials,
ColorIndex = 0
});
}
// Get the first slide, using the GetFirstSlide method.
SlidePart slidePart1 = GetFirstSlide(doc);
// Declare a comments part.
SlideCommentsPart commentsPart;
// Verify that there is a comments part in the first slide part.
if (slidePart1.GetPartsOfType <SlideCommentsPart>().Count() == 0)
{
// If not, add a new comments part.
commentsPart = slidePart1.AddNewPart <SlideCommentsPart>();
}
else
{
// Else, use the first comments part in the slide part.
commentsPart = slidePart1.GetPartsOfType <SlideCommentsPart>().First();
}
// If the comment list does not exist.
if (commentsPart.CommentList == null)
{
// Add a new comments list.
commentsPart.CommentList = new CommentList();
}
// Get the new comment ID.
uint commentIdx = author.LastIndex == null ? 1 : author.LastIndex + 1;
author.LastIndex = commentIdx;
// Add a new comment.
Comment comment = commentsPart.CommentList.AppendChild <Comment>(
new Comment()
{
AuthorId = authorId,
Index = commentIdx,
DateTime = DateTime.Now
});
// Add the position child node to the comment element.
comment.Append(
new Position()
{
X = 100, Y = 200
},
new Text()
{
Text = text
});
// Save the comment authors part.
authorsPart.CommentAuthorList.Save();
// Save the comments part.
commentsPart.CommentList.Save();
}
}