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GroupDocs.Signature for .NET 24.5 (MSI) introduces a significant enhancement in the form of the ability to securely add incremental digital signatures to PDF documents using PFX certificates on Windows.
This version of the .NET Digital Signatures API enables developers to securely add digital signatures to existing PDFs without overwriting previous signatures. Please check out the following code example, which showcases how to sign PDFs incrementally in C#.
// The path to the documents directory. string filePath = Constants.SAMPLE_PDF; string fileName = Path.GetFileName(filePath); string [] certificatePaths = new string[] { Constants.CertificatePfx, Constants.CertificatePfx }; string outputFilePath = Path.Combine(Constants.OutputPath, "SignWithDigitalIncrementalSaving", fileName); int iteration = 1; string documentFile = filePath; foreach (var certificatePath in certificatePaths) { using (Signature signature = new Signature(documentFile)) { DigitalSignOptions options = new DigitalSignOptions(certificatePath) { // certificate password Password = "1234567890", // digital certificate details Reason = $"Approved-{iteration}", Contact = $"John{iteration} Smith{iteration}", Location = $"Location-{iteration}", // no image AllPages = true, // TODO ? Left = 10 + 100*(iteration-1), Top = 10 + 100 * (iteration - 1), Width = 160, Height = 80, Margin = new Padding() { Bottom = 10, Right = 10 } }; SignResult signResult = signature.Sign(outputFilePath, options); documentFile = outputFilePath; Console.WriteLine($"\nSource document signed successfully {iteration++}-time with {signResult.Succeeded.Count} signature(s).\nFile saved at {outputFilePath}."); } }
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You can view the list of all new features, enhancements, and bug fixes introduced in this release by visiting GroupDocs.Signature for .NET 24.5 Release Notes.
