Adding Multiple Signatures to PDF Files using C# and .NET
In the modern world of digital technology, the ability to add electronic signatures to PDF documents is becoming increasingly important. This not only simplifies the document approval process, but also significantly speeds up the workflow. In this article, we will look at how you can add multiple signatures to PDF files using the C# programming language and platform.NET using SautinSoft.Pdf components.
This allows you not only to insert signatures, but also to customize their appearance, as well as add additional data such as location, reason for the signature and date.
The following example shows how you can add multiple signatures to a PDF document by following a few steps:
- Add SautinSoft.Pdf from NuGet.
- Load the PDF document.
- Add a signature field. Create and customize a signature: author, reason, location, date.
- Add an additional signature field. Create and configure a new signature: author, reason, location, date.
- Save the PDF document.
Output result:
Полный код
GitHubusing System;
using System.IO;
using SautinSoft;
using SautinSoft.Pdf;
using SautinSoft.Pdf.Annotations;
using SautinSoft.Pdf.Content;
using SautinSoft.Pdf.Forms;
using SautinSoft.Pdf.Security;
namespace Sample
{
class Sample
{
/// <summary>
/// Fill in PDF interactive forms.
/// </summary>
/// <remarks>
/// Details: https://sautinsoft.com/products/pdf/help/net/developer-guide/add-multi-signature.php
/// </remarks>
static void Main(string[] args)
{
// Before starting this example, please get a free 30-day trial key:
// https://sautinsoft.com/start-for-free/
// Apply the key here:
// PdfDocument.SetLicense("...");
string pdfFile = Path.GetFullPath(@"..\..\..\simple text.pdf");
var document = PdfDocument.Load(pdfFile);
{
// Add a signature field.
var sig = document.Form.Fields.AddSignature(document.Pages[0], 10, 10, 250, 50);
// Create new Signer.
PdfSigner pdfSigner = new PdfSigner(@"..\..\..\Oliver Ekman.pfx", "1234567890");
// Configure signer.
pdfSigner.Timestamper = new PdfTimestamper(@"https://freetsa.org/tsr");
pdfSigner.SignatureFormat = PdfSignatureFormat.CAdES;
pdfSigner.SignatureLevel = PdfSignatureLevel.PAdES_B_LTA;
pdfSigner.HashAlgorithm = PdfHashAlgorithm.SHA256;
pdfSigner.AuthorPermission = PdfUserAccessPermissions.CommentAndFillForm;
pdfSigner.Location = "Test workplace";
pdfSigner.Reason = "Test";
var im = PdfImage.Load(@"..\..\..\IPEG1.jpg");
sig.Appearance.Icon = im;
sig.Appearance.TextPlacement = PdfTextPlacement.TextRightOfIcon;
// Sign PDF Document.
sig.Sign(pdfSigner);
// Save the PDF document. Saving is required to add the next signature.
document.Save();
// Add a new signature field.
sig = document.Form.Fields.AddSignature(document.Pages[1], 10, 10, 100, 50);
// Create new Signer.
pdfSigner = new PdfSigner(@"..\..\..\sautinsoft.pfx", "123456789");
// Configure signer.
pdfSigner.Timestamper = new PdfTimestamper(@"https://freetsa.org/tsr");
pdfSigner.SignatureFormat = PdfSignatureFormat.CAdES;
pdfSigner.SignatureLevel = PdfSignatureLevel.PAdES_B_LTA;
pdfSigner.HashAlgorithm = PdfHashAlgorithm.SHA256;
pdfSigner.Location = "Test workplace";
pdfSigner.Reason = "Test";
im = PdfImage.Load(@"..\..\..\JPEG2.jpg");
sig.Appearance.Icon = im;
sig.Appearance.TextPlacement = PdfTextPlacement.IconOnly;
// Sign the PDF document with another signature.
sig.Sign(pdfSigner);
// Save the PDF document.
document.Save();
}
System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(pdfFile) { UseShellExecute = true });
}
}
}
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