如何使用OpenXML将幻灯片插入另一张PowerPoint幻灯片？

using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Presentation;

using (PresentationDocument sourcePresentation = PresentationDocument.Open("源文件路径", true))
using (PresentationDocument targetPresentation = PresentationDocument.Open("目标文件路径", true))
{
    // 获取源文件和目标文件的幻灯片集合
    PresentationPart sourcePresentationPart = sourcePresentation.PresentationPart;
    PresentationPart targetPresentationPart = targetPresentation.PresentationPart;
    SlideIdList sourceSlideIdList = sourcePresentationPart.Presentation.SlideIdList;
    SlideIdList targetSlideIdList = targetPresentationPart.Presentation.SlideIdList;

    // 获取源文件中要插入的幻灯片
    SlidePart sourceSlidePart = (SlidePart)sourcePresentationPart.GetPartById("要插入的幻灯片的关联ID");

    // 创建一个新的幻灯片关联ID
    string slideRelId = "新的幻灯片关联ID";

    // 在目标文件中创建一个新的幻灯片
    SlidePart newSlidePart = targetPresentationPart.AddNewPart<SlidePart>(slideRelId);

    // 复制源幻灯片的内容到新的幻灯片
    sourceSlidePart.Slide.Save(newSlidePart);

    // 在目标文件的幻灯片集合中插入新的幻灯片
    SlideId newSlideId = targetPresentationPart.Presentation.SlideIdList.AppendChild<SlideId>(new SlideId());
    newSlideId.Id = targetSlideIdList.ChildElements.Count;
    newSlideId.RelationshipId = slideRelId;

    // 保存目标文件的更改
    targetPresentationPart.Presentation.Save();
}