Id

SignatureLine.Id property

获取或设置此签名行的标识符。

当使用签名文档时,此标识符可以与数字签名相关联DigitalSignatureUtil. 这个值必须是唯一的,默认是随机生成的新Guid(NewGuid)。

public Guid Id { get; set; }

例子

演示如何将签名行添加到文档,然后使用数字证书对其进行签名。

public static void Sign()
        {
            string signeeName = "Ron Williams";
            string srcDocumentPath = MyDir + "Document.docx";
            string dstDocumentPath = ArtifactsDir + "SignDocumentCustom.Sign.docx";
            string certificatePath = MyDir + "morzal.pfx";
            string certificatePassword = "aw";

            CreateSignees();

            Signee signeeInfo = mSignees.Find(c => c.Name == signeeName);

            if (signeeInfo != null)
                SignDocument(srcDocumentPath, dstDocumentPath, signeeInfo, certificatePath, certificatePassword);
            else
                Assert.Fail("Signee does not exist.");
        }

        /// <summary>
        /// 创建使用提供的签名者信息和 X509 证书签名的源文档的副本。
        /// </summary>
        private static void SignDocument(string srcDocumentPath, string dstDocumentPath,
            Signee signeeInfo, string certificatePath, string certificatePassword)
        {
            Document document = new Document(srcDocumentPath);
            DocumentBuilder builder = new DocumentBuilder(document);

            // 配置并插入一个签名行,文档中的一个对象,它将显示我们用来签名的签名。
            SignatureLineOptions signatureLineOptions = new SignatureLineOptions
            {
                Signer = signeeInfo.Name, 
                SignerTitle = signeeInfo.Position
            };

            SignatureLine signatureLine = builder.InsertSignatureLine(signatureLineOptions).SignatureLine;
            signatureLine.Id = signeeInfo.PersonId;

            // 首先,我们将保存文档的未签名版本。
            builder.Document.Save(dstDocumentPath);

            CertificateHolder certificateHolder = CertificateHolder.Create(certificatePath, certificatePassword);

            SignOptions signOptions = new SignOptions
            {
                SignatureLineId = signeeInfo.PersonId,
                SignatureLineImage = signeeInfo.Image
            };

            // 用使用证书签名的版本覆盖我们上面保存的未签名文档。
            DigitalSignatureUtil.Sign(dstDocumentPath, dstDocumentPath, certificateHolder, signOptions);
        }

#if NET48 || JAVA
        /// <summary>
        /// 将图像转换为字节数组。
        /// </summary>
        private static byte[] ImageToByteArray(Image imageIn)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                imageIn.Save(ms, ImageFormat.Png);
                return ms.ToArray();
            }
        }
#endif

        public class Signee
        {
            public Guid PersonId { get; set; }
            public string Name { get; set; }
            public string Position { get; set; }
            public byte[] Image { get; set; }

            public Signee(Guid guid, string name, string position, byte[] image)
            {
                PersonId = guid;
                Name = name;
                Position = position;
                Image = image;
            }
        }

        private static void CreateSignees()
        {
            mSignees = new List<Signee>
            {
                #if NET48 || JAVA
                new Signee(Guid.NewGuid(), "Ron Williams", "Chief Executive Officer",
                    ImageToByteArray(Image.FromFile(ImageDir + "Logo.jpg"))),
                #elif NET5_0_OR_GREATER || __MOBILE__
                new Signee(Guid.NewGuid(), "Ron Williams", "Chief Executive Officer", 
                    SkiaSharp.SKBitmap.Decode(ImageDir + "Logo.jpg").Bytes),
                #endif

                #if NET48 || JAVA
                new Signee(Guid.NewGuid(), "Stephen Morse", "Head of Compliance",
                    ImageToByteArray(Image.FromFile(ImageDir + "Logo.jpg")))
                #elif NET5_0_OR_GREATER || __MOBILE__
                new Signee(Guid.NewGuid(), "Stephen Morse", "Head of Compliance", 
                    SkiaSharp.SKBitmap.Decode(ImageDir + "Logo.jpg").Bytes)
                #endif
            };
        }

        private static List<Signee> mSignees;

也可以看看