C# - OpenXML SDK 2.5 - 从幻灯片母版插入新幻灯片，布局包含图像

Question

我在 OpenXML 2.5 SDK 的帮助下用它来创建我的新幻灯片。我设计并使用自己的幻灯片母版来创建一张新幻灯片。我的幻灯片母版包括一些带图像的布局和一些不带图像的布局。

如果我从主布局创建没有图像的幻灯片，则一切正常。如果我使用包含图像的布局创建一张幻灯片，我会得到正确的布局，但在每个固定图像之上还有另一个可移动图像与固定图像重叠，因此存在不必要的固定图像重复，我不需要在我新创建的幻灯片中。

我怎么解决这个问题？

我的代码如下：

       public static void InsertNewSlide(string presentationFile, int position, string layoutName)
      {
        using (PresentationDocument presentationDocument = PresentationDocument.Open(presentationFile, true))
        {

            InsertNewSlide(presentationDocument, position, layoutName);
        }
      }

    public static void InsertNewSlide(PresentationDocument presentationDocument, int position, string layoutName)
    {
        PresentationPart presentationPart = presentationDocument.PresentationPart;

        OpenXML.Slide slide = new OpenXML.Slide(new CommonSlideData(new ShapeTree()));

        SlidePart slidePart = presentationPart.AddNewPart<SlidePart>();

        slide.Save(slidePart);

        SlideMasterPart slideMasterPart = presentationPart.SlideMasterParts.First();

        SlideLayoutPart slideLayoutPart = slideMasterPart.SlideLayoutParts.SingleOrDefault(sl => sl.SlideLayout.CommonSlideData.Name.Value.Equals(layoutName, StringComparison.OrdinalIgnoreCase));

        slidePart.AddPart<SlideLayoutPart>(slideLayoutPart);

        slidePart.Slide.CommonSlideData = (CommonSlideData)slideMasterPart.SlideLayoutParts.SingleOrDefault(sl => sl.SlideLayout.CommonSlideData.Name.Value.Equals(layoutName)).SlideLayout.CommonSlideData.Clone();

        using (Stream stream = slideLayoutPart.GetStream())
        {
            slidePart.SlideLayoutPart.FeedData(stream);

        }

        foreach (ImagePart iPart in slideLayoutPart.ImageParts)
        {
             ImagePart newImagePart = slidePart.AddImagePart(iPart.ContentType, slideLayoutPart.GetIdOfPart(iPart));
                                                        newImagePart.FeedData(iPart.GetStream());
        }
        
        uint maxSlideId = 1;
        SlideId prevSlideId = null;
        var slideIdList = presentationPart.Presentation.SlideIdList;
        foreach (SlideId slideId in slideIdList.ChildElements)
        {
            if (slideId.Id > maxSlideId)
            {
                maxSlideId = slideId.Id;
            }

            position--;
            if (position == 0)
            {
                prevSlideId = slideId;
            }

        }
        maxSlideId++;
        SlideId newSlideId = slideIdList.InsertAfter(new SlideId(), prevSlideId);
        newSlideId.Id = maxSlideId;
        newSlideId.RelationshipId = presentationPart.GetIdOfPart(slidePart);

        presentationPart.Presentation.Save();
    }

}

Answer 1

几年后，但为了帮助其他人 - 无需将不提供占位符功能的节点复制到基于主幻灯片模板（包括图像）的新幻灯片。

线路

using (Stream stream = slideLayoutPart.GetStream())
{
    slidePart.SlideLayoutPart.FeedData(stream);

显然假设您没有在 1 个工作流中添加幻灯片（即您有单独的流用于读取和写入），并且等效行

slidePart.Slide.CommonSlideData = (CommonSlideData)layoutPart.SlideLayout.CommonSlideData.Clone();

这两行代码将所有主数据作为覆盖层复制到新幻灯片上。例如，运行上面答案中的代码块之一，在演示管理器中打开生成的 .pptx 文件并删除您看到的任何形状 - 您会注意到每个项目都位于相同副本（主幻灯片）的顶部版本），您无法删除该版本。因此，此方法会不必要地使文件膨胀，并使 .pptx 的处理变得混乱，并且不符合最终用户的预期。

下面的代码可以工作，包括图像

public static SlidePart AppendNewSlide(PresentationPart presentationPart, SlideLayoutPart masterLayoutPart, out IEnumerable<Shape> placeholderShapes)
{
    Slide clonedSlide = new Slide() {
        ColorMapOverride = new ColorMapOverride {
            MasterColorMapping = new Draw.MasterColorMapping()
        }
    };

    SlidePart clonedSlidePart = presentationPart.AddNewPart<SlidePart>();
    clonedSlidePart.Slide = clonedSlide;
    clonedSlidePart.AddPart(masterLayoutPart);
    clonedSlide.Save(clonedSlidePart);

    var masterShapeTree = masterLayoutPart.SlideLayout.CommonSlideData.ShapeTree;

    placeholderShapes = (from s in masterShapeTree.ChildElements<Shape>()
                           where s.NonVisualShapeProperties.OfType<ApplicationNonVisualDrawingProperties>().Any(anvdp=>anvdp.PlaceholderShape != null)
                           select new Shape()
                           {
                               NonVisualShapeProperties = (NonVisualShapeProperties)s.NonVisualShapeProperties.CloneNode(true),
                               TextBody = new TextBody(s.TextBody.ChildElements<Draw.Paragraph>().Select(p => p.CloneNode(true))) {
                                   BodyProperties = new Draw.BodyProperties(),
                                   ListStyle = new Draw.ListStyle()
                               },
                               ShapeProperties = new ShapeProperties()
                           }).ToList();

    clonedSlide.CommonSlideData = new CommonSlideData
    {
        ShapeTree = new ShapeTree(placeholderShapes) {
            GroupShapeProperties = (GroupShapeProperties)masterShapeTree.GroupShapeProperties.CloneNode(true),
            NonVisualGroupShapeProperties = (NonVisualGroupShapeProperties)masterShapeTree.NonVisualGroupShapeProperties.CloneNode(true)
        }
    };

    SlideIdList slideIdList = presentationPart.Presentation.SlideIdList;

    // Find the highest slide ID in the current list.
    uint maxSlideId = slideIdList.Max(c=>(uint?)((SlideId)c).Id) ?? 256;

    // Insert the new slide into the slide list after the previous slide.
    slideIdList.Append(new SlideId() {
        Id = ++maxSlideId,
        RelationshipId = presentationPart.GetIdOfPart(clonedSlidePart)
    });
    //presentationPart.Presentation.Save();

    return clonedSlidePart;
}

//helper method used above in separate static class
public static IEnumerable<T> ChildElements<T>(this OpenXmlElement el) where T: OpenXmlElement
{
    if (el.HasChildren)
    {
        var child = el.GetFirstChild<T>();
        while (child != null)
        {
            yield return child;
            child = child.NextSibling<T>();
        }
    }
}

假设输出参数 placeholderShapes 在基于主模板创建新幻灯片后开发人员希望更改一些占位符内容