Question 134779 in Visual Studio Code Question posted in
View the official documentation.

Visual Studio Code – OpenXML SDK: How to get "Tag" (p:tag) val of a PowerPoint shape?

I need to check all tags on all shapes on all slides. I can select each shape, however I can’t see how to get the shape’s tags.

For the given DocumentFormat.OpenXml.Presentation.Shape, how can I get the "val" of the tag with name="MOUNTAIN"
In my shape, the tag rId is in this structure: p:sp > p:nvSpPr > p:cNvPr > p:nvPr > p:custDataList > p:tags

I’m guessing my code needs to do these steps:

• Get the rId of the p:custDataLst p:tags
• Look up the "Target" file name in the slideX.xml.rels file, based on the rId
• Look in the root/tags folder for the "Target" file
• Get the p:tagLst p:tags and look for the p:tag with name="MOUNTAIN"
   <p:tagLst
       <p:tag name="MOUNTAIN" val="Denali"/>
   </p:tagLst>

Here is how my code iterates through shapes on each slide:

for (int x = 0; x < doc.PresentationPart.SlideParts.Count(); x++)
{
   SlidePart slide = doc.PresentationPart.SlideParts.ElementAt(x);
   ShapeTree tree = slide.Slide.CommonSlideData.ShapeTree;                        
   IEnumerable<DocumentFormat.OpenXml.Presentation.Shape> slShapes = slide.Slide.Descendants<DocumentFormat.OpenXml.Presentation.Shape>();
   foreach (DocumentFormat.OpenXml.Presentation.Shape shape in slShapes)
   {
      //get the specified tag, if it exists
   }
}

I see an example of how to add tags: How to add custom tags to powerpoint slides using OpenXml in c#
But I can’t figure out how to read the existing tags.

So, how do I get the shape’s tags with c#?

I was hoping to do something like this:

IEnumerable<UserDefinedTagsPart> userDefinedTagsParts = shape.NonVisualShapeProperties.ApplicationNonVisualDrawingProperties.CustomerDataList.CustomerDataTags<UserDefinedTagsPart>();
foreach (UserDefinedTagsPart userDefinedTagsPart in userDefinedTagsParts)
{}

but Visual Studio says "ApplicationNonVisualDrawingProperties does not contain a definition for CustomerDataList".

From the OpenXML Productivity Tool, here is the element tree:

TagsElementTree

Tags:

2

Answers


  1. 0

    I’ve spent a lot of time with OpenXML .docx and .xlsx files … but not so much with .pptx.

    Nevertheless, here are a couple of suggestions that might help:

    1. If you haven’t already done so, please downoad the OpenXML SDK Productivity Tool to analyze your file’s contents. It’s currently available on GitHub:

      https://github.com/dotnet/Open-XML-SDK/releases/tag/v2.5

    2. You might simply be able to "grep" for items you’re looking for.

      EXAMPLE (Word, not PowerPoint… but the same principle should apply):

          using (doc = WordprocessingDocument.Open(stream, true))
     {
         // Init OpenXML members
         mainPart = doc.MainDocumentPart;
         body = mainPart.Document.Body;
         ...
         foreach (var text in body.Descendants<Text>())
         {
             if (text.Text.Contains(target))
                 ...
    Login or Signup to reply.
  2. 0

    You and I seem to be working on similar problems. I’m struggling with learning the file format. The following code is working for me, I’m sure it can be optimized.

            public void ReadTags(Shape shape, SlidePart slidePart)
        {
            NonVisualShapeProperties nvsp = shape.NonVisualShapeProperties;
            ApplicationNonVisualDrawingProperties nvdp = nvsp.ApplicationNonVisualDrawingProperties;
            IEnumerable<CustomerDataTags> data_tags = nvdp.Descendants<CustomerDataTags>();

            foreach (var data_tag in data_tags)
            {
                UserDefinedTagsPart shape_tags = slidePart.GetPartById(data_tag.Id) as UserDefinedTagsPart;

                if (shape_tags != null)
                {
                    foreach (Tag tag in shape_tags.TagList)
                    {
                        Debug.Print($"t{nvsp.NonVisualDrawingProperties.Name} tag {tag.Name} = '{tag.Val}");
                    }
                }                
            }
        }
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search