Delete Signatures of the certain type

GroupDocs.Signature providesΒ overloaded DeleteΒ method that accepts one SignatureType or list of them. Please be aware that thisΒ methodΒ modifies the same document that was passed to constructor ofΒ the SignatureΒ class.

Here are the steps to delete signature by specific type from the document with GroupDocs.Signature:

  • Create new instance ofΒ SignatureΒ class and pass source document path or its stream as a constructor parameter;
  • CallΒ SignatureΒ objectΒ DeleteΒ methodΒ and pass certain SignatureType enumeration to it.

This example shows how to delete QR-Code signatures from the document.

using (Signature signature = new Signature("signed.pdf"))
{
    // deleting QR-Code signatures from the document
    DeleteResult result = signature.Delete(SignatureType.QrCode);
    if (result.Succeeded.Count > 0)
    {
        Console.WriteLine("Following QR-Code signatures were deleted:");                    
        int number = 1;
        foreach (QrCodeSignature temp in result.Succeeded)
        {
            Console.WriteLine($"Signature #{number++}: Type: {temp.SignatureType} Id:{temp.SignatureId}, Text: {temp.Text}");
        }
    }
    else
    {
        Helper.WriteError("No one QR-Code signature was deleted.");
    }
}

Advanced Usage Topics

To learn more about document eSign features, please refer to theΒ Advanced usage section.

More resources

GitHub Examples

You may easily run the code above and see the feature in action in ourΒ GitHub examples:

Free Online Apps

Along with the full-featured .NET library, we provide simple but powerful free online apps.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.