No Form to add fields to on a Syncfusion PDF

I'm using some Syncfusion PDF tools in a couple of my programs. One program reads the fields (and does some record keeping based on some property values) from the PdfLoadedDocument's Form property via a foreach loop. This works fine.

I have another program that takes PDF documents that don't always seem to have a Form property (doc.Form is null). Obviously this is a problem when trying to add a field like this:

PdfLoadedDocument PDF = new PdfLoadedDocument(@"C:\Me\Desktop\test.pdf");
PdfLoadedForm Form = PDF.Form; //Form is null
PdfLoadedPage Page = (PdfLoadedPage)PDF.Pages[0];

//Problem is, form is null for this line
PDF.Form.Fields.Add(new TextField(Page, "TEST_NAME"));

There doesn't seem to be any way to set/create a new Form to add to the document from what I can find in the Syncfusion docs. This makes whatever comes out of this program to not function as expected from the program I mentioned earlier (no Form to read fields from). Am I missing something here or going about this the wrong way?

Solution

We have to create the form before add the fields when an existing PDF document has empty form fields.

Please refer to the following code snippet :

//Load the existing PDF document.
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputfile);

//Create the form if the form does not exist in the loaded document
if (loadedDocument.Form == null)
    loadedDocument.CreateForm();

Please let us know if you have any concern.