序列化FileStream进行传输 [英] Serialize a FileStream for transport

问题描述

另请参阅以下问题:我可以将System.Net.MailMessage传递给WCF服务?

我想在正在发送的邮件中添加附件.附件可以是本地磁盘上的文件，也可以是动态创建的流. WCF合同可以包含一个Stream，但仅当所有参数均为Stream类型时才可以.那么，将一个或多个附件传递给WCF服务的最佳方法是什么?

I'd like to add attachments to the mail being sent. Attachments are either files on the local disc, or dynamically created Streams. A WCF contract can contain a Stream, but only when all arguments are of type Stream. So, what is the best way to pass one or more Attachments to a WCF service?

推荐答案

好的，我已经自己解决了.这里的技巧是将附件转换为Base64编码的字符串，与电子邮件系统执行此操作的方式几乎相同.我创建了一个类来处理这个问题.为其他人张贴在这里:

Alright I've solved this myself. The trick here is to convert the attachment to a Base64 encodes string, much the same way email systems do this. I've created a class to handle this. Posted here for others:

 [DataContract]
    public class EncodedAttachment
    {
        [DataMember(IsRequired=true)]
        public string Base64Attachment;

        [DataMember(IsRequired = true)]
        public string Name;

        /// <summary>
        /// One of the System.Net.Mime.MediaTypeNames
        /// </summary>
        [DataMember(IsRequired = true)]
        public string MediaType;
    }

 public EncodedAttachment CreateAttachment(string fileName)
        {
            EncodedAttachment att = new EncodedAttachment();
            if (!File.Exists(fileName))
                throw new FileNotFoundException("Cannot create attachment because the file was not found", fileName);

            FileInfo fi = new FileInfo(fileName);
            att.Name = fi.Name;
            att.MediaType = System.Net.Mime.MediaTypeNames.Text.Plain;

            using (FileStream reader = new FileStream(fileName, FileMode.Open))
            {
                byte[] buffer = new byte[reader.Length];
                reader.Read(buffer, 0, (int)reader.Length);
                att.Base64Attachment = Convert.ToBase64String(buffer);
            }
            return att;
        }

在客户端:

public void SendEmail(SmallMessage msg)
        {
            using (MailMessage message = new MailMessage())
            {
                message.Body = msg.Body;
                message.Subject = msg.Subject;
                message.To.Add(new MailAddress(msg.To));
                message.From = new MailAddress(msg.From);
                foreach (EncodedAttachment att in msg.Attachments)
                {
                    message.Attachments.Add(CreateAttachment(att));
                }

                SmtpClient client = new SmtpClient();
                client.Send(message);
            }
        }


Attachment CreateAttachment(EncodedAttachment encodedAtt)
{
    MemoryStream reader = new MemoryStream(Convert.FromBase64String(encodedAtt.Base64Attachment));
    Attachment att = new Attachment(reader, encodedAtt.Name, encodedAtt.MediaType);
    return att;            
}

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