Delete Signatures of the certain types

GroupDocs.Signature providesΒ overloaded DeleteΒ method that accepts list of the SignatureType enumeration values. 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 certain types 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 list of the required SignatureType enumerations to it.

This example shows how to delete various signatures types from the document at once.

using (Signature signature = new Signature("signed.pdf"))
{
    // compose the list of signature types to delete
    var signedTypes = new List<SignatureType>
    {
        SignatureType.Text, 
        SignatureType.Image,
        SignatureType.Barcode,
        SignatureType.QrCode,
        SignatureType.Digital
    };
    // deleting QR-Code signatures from the document by signature types
    DeleteResult result = signature.Delete(signedTypes);
    if (result.Succeeded.Count > 0)
    {
        Console.WriteLine("Following signatures were removed:");
        int number = 1;
        foreach (BaseSignature temp in result.Succeeded)
        {
            Console.WriteLine($"Signature #{number++}: Type: {temp.SignatureType} Id:{temp.SignatureId}. Created: {temp.CreatedOn.ToShortDateString()}");
        }
    }
    else
    {
        Helper.WriteError("No one signature was deleted.");
    }
}

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.