1+ using Syncfusion . Drawing ;
2+ using Syncfusion . HtmlConverter ;
3+ using Syncfusion . Pdf ;
4+ using Syncfusion . Pdf . Parsing ;
5+ using Syncfusion . Pdf . Interactive ;
6+
7+ internal class Program
8+ {
9+ static void Main ( string [ ] args )
10+ {
11+ // Initialize the HTML to PDF converter using the Blink rendering engine
12+ HtmlToPdfConverter htmlConverter = new HtmlToPdfConverter ( ) ;
13+
14+ // Configure the converter to preserve form fields in the PDF
15+ BlinkConverterSettings settings = new BlinkConverterSettings
16+ {
17+ EnableForm = true // Ensures form elements like <input>, <textarea> are converted to PDF fields
18+ } ;
19+ htmlConverter . ConverterSettings = settings ;
20+
21+ // Convert the HTML file to a PDF document
22+ PdfDocument document = htmlConverter . Convert ( Path . GetFullPath ( @"Data/Test.html" ) ) ;
23+
24+ // Optional: Remove default appearances for form fields to match the page style
25+ document . Form . SetDefaultAppearance ( false ) ;
26+
27+ // Save the PDF to a memory stream for further processing
28+ using ( MemoryStream stream = new MemoryStream ( ) )
29+ {
30+ document . Save ( stream ) ; // Save converted PDF to memory
31+ stream . Position = 0 ; // Reset stream position
32+ document . Close ( true ) ; // Close the original document
33+
34+ // Replace the "signature" textarea with an actual signature field
35+ AddPdfSignatureField ( stream ) ;
36+ }
37+ }
38+
39+ /// <summary>
40+ /// Finds the "signature" field in the form, removes it, and replaces it with a true PDF signature field.
41+ /// </summary>
42+ /// <param name="stream">MemoryStream containing the PDF document</param>
43+ static void AddPdfSignatureField ( MemoryStream stream )
44+ {
45+ // Load the PDF document from memory stream
46+ using ( PdfLoadedDocument loadedDocument = new PdfLoadedDocument ( stream ) )
47+ {
48+ PdfLoadedForm loadedForm = loadedDocument . Form ;
49+
50+ // Check for a field named "signature"
51+ if ( loadedForm . Fields [ "signature" ] is PdfLoadedTextBoxField signatureTextBox )
52+ {
53+ // Get the original field's position and page
54+ RectangleF bounds = signatureTextBox . Bounds ;
55+ PdfPageBase page = signatureTextBox . Page ;
56+
57+ // Remove the original textbox field
58+ loadedForm . Fields . Remove ( signatureTextBox ) ;
59+
60+ // Create a new signature field at the same location
61+ PdfSignatureField signatureField = new PdfSignatureField ( page , "ClientSignature" )
62+ {
63+ Bounds = bounds
64+ } ;
65+
66+ // Add the new signature field to the form
67+ loadedForm . Fields . Add ( signatureField ) ;
68+ }
69+
70+ // Save the modified document to disk
71+ using ( FileStream outputStream = new FileStream ( Path . GetFullPath ( @"Output/Output.pdf" ) , FileMode . Create , FileAccess . Write ) )
72+ {
73+ loadedDocument . Save ( outputStream ) ;
74+ }
75+ // Close the document and release resources
76+ loadedDocument . Close ( true ) ;
77+ }
78+ }
79+ }
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