private int ReorderSlides(string fileName, int currentSlidePosition, int newPosition)
{
int returnValue = -1;
if (newPosition == currentSlidePosition)
{
return(returnValue);
}
using (PresentationDocument doc = PresentationDocument.Open(fileName, true))
{
PresentationPart presentationPart = doc.PresentationPart;
if (presentationPart == null)
{
throw new ArgumentException("Presentation part not found.");
}
int slideCount = presentationPart.SlideParts.Count();
if (slideCount == 0)
{
return(returnValue);
}
int maxPosition = slideCount - 1;
CalculatePositions(ref currentSlidePosition, ref newPosition, maxPosition);
if (newPosition != currentSlidePosition)
{
DocumentFormat.OpenXml.Presentation.Presentation presentation = presentationPart.Presentation;
SlideIdList slideIdList = presentation.SlideIdList;
SlideId sourceSlide = (SlideId)(slideIdList.ChildElements[currentSlidePosition]);
SlideId targetSlide = (SlideId)(slideIdList.ChildElements[newPosition]);
sourceSlide.Remove();
if (newPosition > currentSlidePosition)
{
slideIdList.InsertAfter(sourceSlide, targetSlide);
}
else
{
slideIdList.InsertBefore(sourceSlide, targetSlide);
}
returnValue = newPosition;
presentation.Save();
}
}
return(returnValue);
}
public static void DeleteSlide(string presentationFile)
{
if (presentationFile == null)
{
throw new ArgumentNullException("presentationDocument");
}
using (PresentationDocument presentationDocument = PresentationDocument.Open(presentationFile, true))
{
// Get the presentation part from the presentation document.
PresentationPart presentationPart = presentationDocument.PresentationPart;
// Get the presentation from the presentation part.
DocumentFormat.OpenXml.Presentation.Presentation presentation = presentationPart.Presentation;
// Get the list of slide IDs in the presentation.
SlideIdList slideIdList = presentation.SlideIdList;
int slideIdx = -1;
foreach (SlideId _slideId in presentation.SlideIdList)
{
slideIdx++;
// Get the slide ID of the specified slide
SlideId slideId = slideIdList.ChildElements[slideIdx] as SlideId;
// Get the relationship ID of the slide.
string slideRelId = slideId.RelationshipId;
// Get the slide part for the specified slide.
SlidePart slidePart = presentationPart.GetPartById(slideRelId) as SlidePart;
if (slidePart.Slide.Show != null)
{
if (slidePart.Slide.Show.HasValue != null)
{
// Remove the slide from the slide list.
slideIdList.RemoveChild(slideId);
// Remove references to the slide from all custom shows.
if (presentation.CustomShowList != null)
{
// Iterate through the list of custom shows.
foreach (var customShow in presentation.CustomShowList.Elements <CustomShow>())
{
if (customShow.SlideList != null)
{
// Declare a link list of slide list entries.
LinkedList <SlideListEntry> slideListEntries = new LinkedList <SlideListEntry>();
foreach (SlideListEntry slideListEntry in customShow.SlideList.Elements())
{
// Find the slide reference to remove from the custom show.
if (slideListEntry.Id != null && slideListEntry.Id == slideRelId)
{
slideListEntries.AddLast(slideListEntry);
}
}
// Remove all references to the slide from the custom show.
foreach (SlideListEntry slideListEntry in slideListEntries)
{
customShow.SlideList.RemoveChild(slideListEntry);
}
}
}
}
// Save the modified presentation.
presentation.Save();
// Remove the slide part.
presentationPart.DeletePart(slidePart);
break;
}
}
}
}
}