iTextSharp upgrade to iText7 .NET

This is my iText5 code that does what I have previously required done with HTML snippets;

//GetFieldPositions returns an array of field positions if you are using 5.0 or greater
rectangle = pdfStamper.AcroFields.GetFieldPositions(field.Key)[0].position;

//tell itextSharp to overlay this content
PdfContentByte contentBtye = pdfStamper.GetOverContent(1);

var elements = XMLWorkerHelper.ParseToElementList(pdfPlaceHolderData[key].ToString(), null);

ColumnText ct = new ColumnText(contentBtye);

ct.SetSimpleColumn(rectangle.Left, rectangle.Bottom, rectangle.Right, rectangle.Top);

ct.Add(elements);

ct.Go(false);

pdfFormFields.SetField(field.Key, string.Empty);


I am struggling to see how to convert this to work in iText7 .NET.

XMLWorkerHelper.ParseToElementList returns 'ElementList' which inherits 'List'. 'IElement' is structured as follows;

The iText7 Html2Pdf call to HtmlConverter.ConvertToElements(html) returns an 'IList'. However 'IElement' is now structured as follows;

I was hoping that I could of just used this result but obviously my call to 'ct.Add(elements);' in the above code chokes because of the different IElement structure.

I know I am trying to cut corners here (I have no choice at the moment); is there a relatively easy way to convert the iText7 IElement to the iTextSharp IElement that will retain my nicely parsed HTML with images?

How can I replace an acro form field content with parsed HTML instead? This would preferably be in iTextSharp 5, but I suppose would be even better using the latest version?

I currently have a solution working happily with iTextSharp 5 that allows PDF templates to populated dynamically. I have hit a problem using the XMLWorkerHelper.ParseToElementList as it does not seem to support parsing inline images.

XMLWorkerHelper.ParseToElementList

I have found that iText7 for .net has an extension called html2pdf that has a method called HtmlConverter.ConvertToElements that does perfectly parse HTML with inline images however the result is not compatible with my iTextSharp 5 implementation and I am struggling in trying to convert it.

html2pdf

HtmlConverter.ConvertToElements

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