c# - 使用 openxml 合并演示文稿文件时显示空白的图像

Question

我取消使用 OpenXml 将幻灯片从多个演示文稿复制到新演示文稿。下面的代码工作正常，除了复制幻灯片后没有显示图像。创建新的演示文件时图像显示为空白。

        public async Task<bool> Copy(PresentationDetailsModel slides)
        {
            string path = HttpContext.Current.Server.MapPath("~/");   //get server path

            string mergedPresentation = "newlygen.pptx";    //create new ppt
            string presentationTemplate = "present1.pptx";  //copy presentation file
            string[] sourcePresentations = new string[]
            { "present2.pptx" };    //files list for copying slides
            string presentationFolder = path + @"/Data/";

            // Make a copy of the template presentation. This will throw an
            // exception if the template presentation does not exist.
            File.Copy(presentationFolder + presentationTemplate,
              presentationFolder + mergedPresentation, true);

            // Loop through each source presentation and merge the slides 
            // into the merged presentation.
            foreach (string sourcePresentation in sourcePresentations)
                MergeSlides(presentationFolder, sourcePresentation,
                  mergedPresentation);
                  
        }


        static void MergeSlides(string presentationFolder, string sourcePresentation, string destPresentation)
        {
            int id = 0;

            // Open the destination presentation.
            using (PresentationDocument myDestDeck =
              PresentationDocument.Open(presentationFolder + destPresentation,
              true))
            {
                PresentationPart destPresPart = myDestDeck.PresentationPart;

                // If the merged presentation does not have a SlideIdList 
                // element yet, add it.
                if (destPresPart.Presentation.SlideIdList == null)
                    destPresPart.Presentation.SlideIdList = new SlideIdList();

                // Open the source presentation. This will throw an exception if
                // the source presentation does not exist.
                using (PresentationDocument mySourceDeck = PresentationDocument.Open(presentationFolder + sourcePresentation, false))
                {
                    PresentationPart sourcePresPart =
                      mySourceDeck.PresentationPart;

                    // Get unique ids for the slide master and slide lists
                    // for use later.
                    var uniqueId =
                      GetMaxSlideMasterId(
                        destPresPart.Presentation.SlideMasterIdList);

                    uint maxSlideId =
                      GetMaxSlideId(destPresPart.Presentation.SlideIdList);

                    // Copy each slide in the source presentation, in order, to 
                    // the destination presentation.
                    foreach (SlideId slideId in
                      sourcePresPart.Presentation.SlideIdList)
                    {
                        SlidePart sp;
                        SlidePart destSp;
                        SlideMasterPart destMasterPart;
                        string relId;
                        SlideMasterId newSlideMasterId;
                        SlideId newSlideId;

                        // Create a unique relationship id.
                        id++;
                        sp =
                          (SlidePart)sourcePresPart.GetPartById(
                            slideId.RelationshipId);

                        relId =
                          sourcePresentation.Remove(
                            sourcePresentation.IndexOf('.')) + id;

                        // Add the slide part to the destination presentation.
                        destSp = destPresPart.AddPart<SlidePart>(sp, relId);

                        // The slide master part was added. Make sure the
                        // relationship between the main presentation part and
                        // the slide master part is in place.
                        destMasterPart = destSp.SlideLayoutPart.SlideMasterPart;
                        destPresPart.AddPart(destMasterPart);

                        // Add the slide master id to the slide master id list.
                        uniqueId++;
                        newSlideMasterId = new SlideMasterId();
                        newSlideMasterId.RelationshipId =
                          destPresPart.GetIdOfPart(destMasterPart);
                        newSlideMasterId.Id = uniqueId;

                        destPresPart.Presentation.SlideMasterIdList.Append(
                          newSlideMasterId);

                        // Add the slide id to the slide id list.
                        maxSlideId++;
                        newSlideId = new SlideId();
                        newSlideId.RelationshipId = relId;
                        newSlideId.Id = maxSlideId;

                        destPresPart.Presentation.SlideIdList.Append(newSlideId);
                    }

                    // Make sure that all slide layout ids are unique.
                    FixSlideLayoutIds(destPresPart, uniqueId);
                }

                // Save the changes to the destination deck.
                destPresPart.Presentation.Save();
            }
        }

        static void FixSlideLayoutIds(PresentationPart presPart, uint uniqueId)
        {
            // Make sure that all slide layouts have unique ids.
            foreach (SlideMasterPart slideMasterPart in
              presPart.SlideMasterParts)
            {
                foreach (SlideLayoutId slideLayoutId in
                  slideMasterPart.SlideMaster.SlideLayoutIdList)
                {
                    uniqueId++;
                    slideLayoutId.Id = (uint)uniqueId;
                }

                slideMasterPart.SlideMaster.Save();
            }
        }

        static uint GetMaxSlideId(SlideIdList slideIdList)
        {
            // Slide identifiers have a minimum value of greater than or
            // equal to 256 and a maximum value of less than 2147483648. 
            uint max = 256;

            if (slideIdList != null)
                // Get the maximum id value from the current set of children.
                foreach (SlideId child in slideIdList.Elements<SlideId>())
                {
                    uint id = child.Id;

                    if (id > max)
                        max = id;
                }

            return max;
        }

        static uint GetMaxSlideMasterId(SlideMasterIdList slideMasterIdList)
        {
            // Slide master identifiers have a minimum value of greater than
            // or equal to 2147483648. 
            uint max = 2147483648;

            if (slideMasterIdList != null)
                // Get the maximum id value from the current set of children.
                foreach (SlideMasterId child in
                  slideMasterIdList.Elements<SlideMasterId>())
                {
                    uint id = child.Id;

                    if (id > max)
                        max = id;
                }

            return max;
        }

上面的代码适用于将幻灯片从一个演示文稿复制到新创建的演示文稿，但特定幻灯片的图像显示为空白。任何想法？我发现下面的代码。谁能帮我将下面的代码与上面的代码合并。

foreach (sourceSlide.ImageParts 中的 ImagePart 部分) { ImagePart newpart = slidePartClone.AddNewPart(part.ContentType, sourceSlide.GetIdOfPart(part)); newpart.FeedData(part.GetStream()); }

标签： c#asp.netopenxml