GroupDocs.Signature for .NET 21.3 Release Notes

    public class Signature
    {
        /// <summary>
        /// Deletes signatures of the certain type SignatureType from the document.
        /// Only signatures that were added by Sign method and marked as Signatures (BaseSignature.IsSignature property) will be removed.
        /// Following signature types are supported: Text, Image, Barcode, QR-Code, Digital
        /// </summary>
        public DeleteResult Delete(SignatureType signatureType);

        public DeleteResult Delete(List<SignatureType> signatureTypes);
   }

using (Signature signature = new Signature("signed.pdfx"))
{                
    // deleting Digital signatures from the document
    DeleteResult result = signature.Delete(SignatureType.Digital);
    if (result.Succeeded.Count > 0)
    {
        Console.WriteLine("Following Digital signatures were deleted:");                    
        int number = 1;
        foreach (DigitalSignature temp in result.Succeeded)
        {
            Console.WriteLine($"Signature #{number++}: Type: {temp.SignatureType} Id:{temp.SignatureId}");
        }
    }
}

    /// <summary>
    /// Represents signature preview options.
    /// </summary>
    public class PreviewSignatureOptions
    {
        /// <summary>
        /// Unique value to distinct the signature.
        /// Use SignatureId to identify the preview options.
        /// </summary>
        public string SignatureId { get; set; }

        /// <summary>
        /// Signature Options for generate preview.
        /// </summary>
        public SignOptions SignOptions { get; set; }

        /// <summary>
        /// Gets or sets preview images format.
        /// Default value is PNG
        /// </summary>
        public PreviewFormats PreviewFormat { get; set; } = PreviewFormats.PNG;

        /// <summary>
        /// Initializes PreviewSignatureOptions object.
        /// </summary>
        public PreviewSignatureOptions(SignOptions signOptions, CreateSignatureStream createSignatureStream);

        /// <summary>
        /// Initializes PreviewSignatureOptions object.
        /// </summary>
        public PreviewSignatureOptions(SignOptions signOptions, CreateSignatureStream createSignatureStream, ReleaseSignatureStream releaseSignatureStream);

        /// <summary>
        /// Signature preview supported formats
        /// </summary>
        public enum PreviewFormats
        {
            /// <summary>
            /// PNG
            /// </summary>
            PNG,
            /// <summary>
            /// JPEG
            /// </summary>
            JPEG,
            /// <summary>
            /// BMP
            /// </summary>
            BMP
        }        
    }

    /// <summary>
    /// Delegate that defines method to create output signature preview stream.
    /// </summary>
    public delegate Stream CreateSignatureStream(PreviewSignatureOptions previewOptions);

    /// <summary>
    /// Delegate that defines method to release output signature preview stream.
    /// </summary>
    public delegate void ReleaseSignatureStream(PreviewSignatureOptions previewOptions, Stream signatureStream);
}

    public class Signature
    {
        /// <summary>
        /// Generates Signature preview based on given SignOptions
        /// </summary>
        public static void GenerateSignaturePreview(PreviewSignatureOptions previewOptions);
   }

public static void Run()
{    
    // no need Siganture object since method is static

    // create options
    QrCodeSignOptions signOptions = new QrCodeSignOptions
    {
        EncodeType = QrCodeTypes.QR,
        // setup Data property with Address object
        Data = new GroupDocs.Signature.Domain.Extensions.Address()
        {
            Street = "221B Baker Street",
            City = "London",
            State = "NW",
            ZIP = "NW16XE",
            Country = "England"
        },
        // set right bottom corner
        HorizontalAlignment = HorizontalAlignment.Left,
        VerticalAlignment = VerticalAlignment.Center,
        Width = 100,
        Height = 100,
        Margin = new Padding(10)
    };

    // create signature preview options object
    PreviewSignatureOptions previewOption = new PreviewSignatureOptions(signOptions, CreateSignatureStream, ReleaseSignatureStream)
    {
        SignatureId = Guid.NewGuid().ToString(),
        PreviewFormat = PreviewSignatureOptions.PreviewFormats.JPEG,
    };
    // generate preview
    Signature.GenerateSignaturePreview(previewOption);
}

private static Stream CreateSignatureStream(PreviewSignatureOptions previewOptions)
{
    SignOptions signOptions = previewOptions.SignOptions;
    string imageFilePath = $"signature-{previewOptions.SignatureId}-{previewOptions.SignOptions.GetType().Name}.jpg";
    return new FileStream(imageFilePath, FileMode.Create);
}

private static void ReleaseSignatureStream(PreviewSignatureOptions previewOptions, Stream signatureStream)
{
    signatureStream.Dispose();
    Console.WriteLine($"Signature {previewOptions.SignatureId}-{previewOptions.SignOptions.GetType().Name} is ready for preview");
}