PdfDocumentSigner.GetSignatureFieldNames(Boolean) Method
Retrieves names of signature fields.
Namespace: DevExpress.Pdf
Assembly: DevExpress.Docs.v20.1.dll
NuGet Package: DevExpress.Document.Processor
Declaration
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;
//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", PdfHashAlgorithm.SHA256);
//Retrieve all signed form fields:
var signedFields = signer.GetSignatureNames(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";
//Sign and save the document
signer.SaveDocument("SignedDocument.pdf", santuzzaSignature);
}
See Also