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.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+

PdfDocumentSigner.GetSignatureFieldNames(Boolean) Method

Retrieves names of signature fields.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Docs.v21.1.dll

Declaration

public IList<string> GetSignatureFieldNames(
    bool emptyFieldsOnly
)

Parameters

Name Type Description
emptyFieldsOnly Boolean

true to retrieve names of not signed fields only; otherwise, false.

Returns

Type Description
IList<String>

A list of form fields’ names.

Remarks

Use the GetSignatureNames method to get names of signed form fields. You can use the PdfDocumentSigner.ClearSignatureField to clear the signed field.

The code sample below shows how to retrieve signed form field names and apply a new signature to the first field:

using DevExpress.Pdf;
using System.Diagnostics;
using System.IO;
using DevExpress.Office.DigitalSignatures;

// Load a document to sign:
using (var signer = new PdfDocumentSigner("Document.pdf"))
{
    // Create a PKCS#7 signature:
    Pkcs7Signer pkcs7Signature = new Pkcs7Signer("Signing Documents//certificate.pfx", "123", 
        HashAlgorithmType.SHA256);

    // Retrieve all signed form fields:
    var signedFields = signer.GetSignatureFieldNames(false);

    // Clear the first signature field:
    signer.ClearSignatureField(signedFields[0]);

    // Apply a new signature to this form field:
    var santuzzaSignature = new PdfSignatureBuilder(pkcs7Signature, signedFields[0]);

    // Specify image and signer information:
    santuzzaSignature.SetImageData(File.ReadAllBytes("Signing Documents//SantuzzaValentina.jpg"));
    santuzzaSignature.Location = "Australia";
    santuzzaSignature.Name = "Santuzza Valentina";
    santuzzaSignature.Reason = "I Agree";
    santuzzaSignature.CertificationLevel = PdfCertificationLevel.FillFormsAndAnnotate;

    // Sign and save the document:
    signer.SaveDocument("SignedDocument.pdf", santuzzaSignature);
}
See Also