MailAttachment序列化和反序列化无法正常工作

时间:2011-02-26 10:44:53

标签: .net-3.5 xml-serialization email-attachments

我正在尝试使用IXmlSerializable接口的实现来序列化MailMessage对象。然后使用Image DataType将序列化对象存储在数据库(即使用SQL Server CE 3.5)中。除了附件集合之外,反序列化的一切正常。在deserilzing图像附加但没有在电子邮件中正确显示,文本文件是空的。

这是反序列化的代码(仅限附件列表部分)

 // Attachments
            XmlNode attachmentsNode = GetConfigSection(xml, "SerializableMailMessage/MailMessage/Attachments");
            if (attachmentsNode != null)
            {
                foreach (XmlNode node in attachmentsNode.ChildNodes)
                {
                    string contentTypeString = string.Empty;
                    if (node.Attributes["ContentType"] != null)
                        contentTypeString = node.Attributes["ContentType"].Value;

                    ContentType contentType = new ContentType(contentTypeString);

                    MemoryStream stream = new MemoryStream();
                    byte[] data = Encoding.UTF8.GetBytes(node.InnerText);
                    stream.Write(data, 0, data.Length);

                    Attachment attachment = new Attachment(stream, contentType);
                    this.Email.Attachments.Add(attachment);
                }
            }

        private XmlNode GetConfigSection(XmlDocument xml, string nodePath)
        {
            return xml.SelectSingleNode(nodePath);
        }

这是序列化的代码

// Attachments
                if (this.AttachmentList!=null)
                {
                    writer.WriteStartElement("Attachments");

                    foreach (Attachment attachment in this.AttachmentList)
                    {
                        writer.WriteStartElement("Attachment");

                        if (!string.IsNullOrEmpty(attachment.Name))
                            writer.WriteAttributeString("ContentType", attachment.ContentType.ToString());

                        using (BinaryReader reader = new BinaryReader(attachment.ContentStream))
                        {
                            byte[] data = reader.ReadBytes((int)attachment.ContentStream.Length);

                            writer.WriteBase64(data, 0, data.Length);
                        }

                        writer.WriteEndElement();
                    }

                    writer.WriteEndElement();
                }

我从CodePlex上的GOPI C#邮件发送库中获取了此代码 http://gopi.codeplex.com/

即使在问题跟踪器中,这也是一个问题。请告知可能出现的问题。

编辑1 :很抱歉,我发布了我的试用代码。现在显示了正确的代码。(在writer.WriteBase64的序列化代码中(data,0,data.Length);

1 个答案:

答案 0 :(得分:2)

您在序列化上转换为Base64,但在反序列化

上不这样做
byte[] data = Convert.FromBase64String (node.InnerText);