Getting a repair error when copy slide from one presentation to another using open xml sdk

private static uint CreateId(SlideIdList slideIdList)
{
uint currentId = 0;
foreach (SlideId slideId in slideIdList)
{
if (slideId.Id > currentId)
{
currentId = slideId.Id;
}
}

        return ++currentId;
    }

    private static uint CreateId(SlideMasterIdList slideMasterIdList)
    {
        uint currentId = 0;
        foreach (SlideMasterId masterId in slideMasterIdList)
        {
            if (masterId.Id > currentId)
            {
                currentId = masterId.Id;
            }
        }

        return ++currentId;
    }

    public static void Copy(string sourcePresentationStream, uint copiedSlidePosition, string destPresentationStream)
    {
        using (var destDoc = PresentationDocument.Open(destPresentationStream, true))
        {
            var sourceDoc = PresentationDocument.Open(sourcePresentationStream, false);
            var destPresentationPart = destDoc.PresentationPart;
            var destPresentation = destPresentationPart.Presentation;

            var sourcePresentationPart = sourceDoc.PresentationPart;
            var sourcePresentation = sourcePresentationPart.Presentation;

            int copiedSlideIndex = (int)--copiedSlidePosition;

            int countSlidesInSourcePresentation = sourcePresentation.SlideIdList.Count();
            if (copiedSlideIndex < 0 || copiedSlideIndex >= countSlidesInSourcePresentation)
                throw new ArgumentOutOfRangeException(nameof(copiedSlidePosition));

            SlideId copiedSlideId = sourcePresentationPart.Presentation.SlideIdList.ChildElements[copiedSlideIndex] as SlideId;
            SlidePart copiedSlidePart = sourcePresentationPart.GetPartById(copiedSlideId.RelationshipId) as SlidePart;

            SlidePart addedSlidePart = destPresentationPart.AddPart<SlidePart>(copiedSlidePart);

            NotesSlidePart noticePart = addedSlidePart.GetPartsOfType<NotesSlidePart>().FirstOrDefault();
            if (noticePart != null)
            {
                addedSlidePart.DeletePart(noticePart);
            }

            SlideMasterPart addedSlideMasterPart = destPresentationPart.AddPart(addedSlidePart.SlideLayoutPart.SlideMasterPart);

            // Create new slide ID
            SlideId slideId = new SlideId
            {
                Id = CreateId(destPresentation.SlideIdList),
                RelationshipId = destDoc.PresentationPart.GetIdOfPart(addedSlidePart)
            };
            destPresentation.SlideIdList.Append(slideId);

            // Create new master slide ID
            uint masterId = CreateId(destPresentation.SlideMasterIdList);
            SlideMasterId slideMaterId = new SlideMasterId
            {
                Id = masterId,
                RelationshipId = destDoc.PresentationPart.GetIdOfPart(addedSlideMasterPart)
            };
            destDoc.PresentationPart.Presentation.SlideMasterIdList.Append(slideMaterId);

            destDoc.PresentationPart.Presentation.Save();

            // Make sure that all slide layouts have unique ids.
            foreach (SlideMasterPart slideMasterPart in destDoc.PresentationPart.SlideMasterParts)
            {
                foreach (SlideLayoutId slideLayoutId in slideMasterPart.SlideMaster.SlideLayoutIdList)
                {
                    masterId++;
                    slideLayoutId.Id = masterId;
                }

                slideMasterPart.SlideMaster.Save();
            }

            destDoc.PresentationPart.Presentation.Save();
            destDoc.Close();
            sourceDoc.Close();
        }
        //sourcePresentationStream.Close();
        // destPresentationStream.Close();
    }

@Swapnil Sharma , based on my test, I reproduced the same error with you. And based on my further research, I find it is hard for me to solve the issue.

However, I find an alternative simple way to use Microsoft.Office.Interop.PowerPoint to copy a slide from one presentation to another.

First, Please try to install nuget-package Microsoft.Office.Interop.PowerPoint.

Second, Please try the following code to do it.

using PowerPoint = Microsoft.Office.Interop.PowerPoint;  
  
namespace ConsoleApp1  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            PowerPoint.Application app = new PowerPoint.Application();  
            PowerPoint.Presentation p1= app.Presentations.Open("D:\\1.pptx",WithWindow:MsoTriState.msoFalse);  
            PowerPoint.Presentation p2 = app.Presentations.Open("D:\\3.pptx", WithWindow: MsoTriState.msoFalse);  
            PowerPoint.Slide s = p1.Slides[2];  
            s.Copy();  
            p2.Slides.Paste();  
            p2.Save();  
            p1.Close();  
            p2.Close();  
  
  
        }  
    }  
}  

Best Regards,

Jack

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