Merge pull request #243 from SyncfusionExamples/1006681

1006681: How to Sign All Pages Using a Group Signature

Author: chinnumuniyappan

Digital Signature/Group-signature-for-all-pages/.NET/Group-signature-for-all-pages.slnx

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+<Solution>
+  <Project Path="Group-signature-for-all-pages/Group-signature-for-all-pages.csproj" />
+</Solution>

Digital Signature/Group-signature-for-all-pages/.NET/Group-signature-for-all-pages/Data/Input.pdf

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Group_signature_for_all_pages</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="*" />
+  </ItemGroup>
+
+</Project>

Digital Signature/Group-signature-for-all-pages/.NET/Group-signature-for-all-pages/Data/PDF.pfx

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+using Syncfusion.Drawing;
+using Syncfusion.Pdf;
+using Syncfusion.Pdf.Graphics;
+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Security;
+
+// Load the PDF document
+using (PdfLoadedDocument document = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
+{
+    // Ensure the form (AcroForm) exists before adding signature fields
+    if (document.Form == null)
+        document.CreateForm();
+    // Turn off automatic field naming if you want full control over field names
+    document.Form.FieldAutoNaming = false;
+    // Create certificate from PFX file
+    PdfCertificate pdfCert = new PdfCertificate(Path.GetFullPath(@"Data/PDF.pfx"), "syncfusion");
+    // Load the signature image once 
+    using FileStream imageStream = new FileStream(Path.GetFullPath(@"Data/Signature.png"), FileMode.Open, FileAccess.Read);
+    PdfBitmap signatureImage = new PdfBitmap(imageStream);
+    // Iterate pages and add a signature field to each page
+    for (int i = 0; i < document.Pages.Count; i++)
+    {
+        // Get current page
+        PdfPageBase page = document.Pages[i];
+        // Create a signature field on the page using the certificate
+        PdfSignature signature = new PdfSignature(document, page, pdfCert, "Signature");
+        // Position & size of the signature field
+        signature.Bounds = new RectangleF(new PointF(350, 200), new SizeF(100, 60));
+        // Draw the signature image into the signature appearance once
+        signature.Appearance.Normal.Graphics.DrawImage(
+            signatureImage,
+            0, 0,
+            signature.Bounds.Width,
+            signature.Bounds.Height
+        );
+    }
+    // Save the PDF document
+    document.Save(Path.GetFullPath(@"Output/Output.pdf"));
+}