Add Image Failing

[ogmiosnetworks]

Adding an image to a slide fails with the error:

System.ArgumentException: 
'Invalid name character in 'creationId xmlns:a16="http://schemas.microsoft.com/office/drawing/2014/main" 
id="{4C9EFE4F-2DDB-7B29-01C3-5A94A8DA92D4}" />'. 
The ' ' character, hexadecimal value 0x20, cannot be included in a name.'

I cloned the repository and compiled my code against it. I was able to fix the issue by commenting out 2 lines in FileFormat.Slides.Facade.ImageFacade.cs in the GeneratePicture method:

          ------------------  8< ---- snip ---- >8  ------------------
D.NonVisualDrawingPropertiesExtension nonVisualDrawingPropertiesExtension1 = new D.NonVisualDrawingPropertiesExtension() { Uri = "{FF2B5EF4-FFF2-40B4-BE49-F238E27FC236}" };

//
// Removing these two lines made the error go away and PowerPoint did not complain about anything in the resulting presentation
//
//OpenXmlUnknownElement openXmlUnknownElement1 = new OpenXmlUnknownElement("<a16:creationId xmlns:a16=\"http://schemas.microsoft.com/office/drawing/2014/main\" id=\"{4C9EFE4F-2DDB-7B29-01C3-5A94A8DA92D4}\" />");
 //nonVisualDrawingPropertiesExtension1.Append(openXmlUnknownElement1);

nonVisualDrawingPropertiesExtensionList1.Append(nonVisualDrawingPropertiesExtension1);

          ------------------  8< ---- snip ---- >8  ------------------

I don't know enough to know if that was a good idea or a bad idea, but it worked for me.

Minimal reproduction case:

using DocumentFormat.OpenXml.Spreadsheet;
using FileFormat.Slides;

Presentation presentation = Presentation.Create(@"C:\temp\test_add_image.pptx");

Slide slide = new();

var image = new Image(@"C:\Temp\test_img.jpg")
{
    X = 0,
    Y = 0,
    Width = 200.0,
    Height = 200.0
};

slide.AddImage(image);

presentation.AppendSlide(slide);

presentation.Save();

Windows 10
.Net 8.0
FileFormat.Slides version 25.1.0 from nuget and repeatable from source

-Cam