MailMessage to EML

時間 2019-12-07

標籤 mailmessage eml 简体版

原文原文鏈接

EML格式是微軟公司在Outlook中所使用的一種遵循RFC822及其後續擴展的文件格式,併成爲各種電子郵件軟件的通用格式。html

作個筆記，C# 郵件處理保存爲eml格式；dom

1、網上好多這樣的寫法，能夠在.net formwork4.5裏面百試不爽…………this

  /// <summary>
        /// 2.0能夠容許  4.5不能夠
        /// </summary>
        /// <param name="msg"></param>
        /// <returns></returns>
        public static byte[] MailMessageToArray(MailMessage msg)
        {
            const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy;
            using (var ms = new MemoryStream())
            {
                var assembly = typeof(SmtpClient).Assembly;
                var writerType = assembly.GetType("System.Net.Mail.MailWriter");
                var writer = Activator.CreateInstance(writerType, flags, null, new object[] { ms }, CultureInfo.InvariantCulture);
                msg.GetType().GetMethod("Send", flags).Invoke(msg, new[] { writer, true });
                return ms.ToArray();
            }
        }

.netformwork 4.5 運行報錯---「用戶代碼未處理TargetParameterCountException 參數不匹配」編碼

2、柳暗花明spa

不得不說仍是老外的技術牛逼些…….net

      /// <summary>
        /// MailMessage 轉換成eml
        /// </summary>
        /// <param name="msg">MailMessage</param>
        /// <returns>eml字符串</returns> 
        static string MailMessageToEml(MailMessage msg)
        {
            Assembly assembly = typeof(SmtpClient).Assembly;
            Type mailWriterType = assembly.GetType("System.Net.Mail.MailWriter");
            using (MemoryStream stream = new MemoryStream())
            {
                ConstructorInfo mailWriterContructor = mailWriterType.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(Stream) }, null);
                object mailWriter = mailWriterContructor.Invoke(new object[] { stream });
                MethodInfo sendMethod = typeof(MailMessage).GetMethod("Send", BindingFlags.Instance | BindingFlags.NonPublic);
                sendMethod.Invoke(msg, BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { mailWriter, true, true }, null); 
                return System.Text.Encoding.UTF8.GetString(stream.ToArray());
                //return Encoding.Default.GetString( stream.ToArray());
            } 
        }

效果槓桿的code

國外的大牛就是同樣，發現和他的差距太TM的不小。。。。還有一種解決方案orm

public static class MailMessageExtensions
{
    public static string RawMessage(this MailMessage m)
    {
        var smtpClient = new SmtpClient { DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory };

        using (var tempDir = new TemporaryDirectory())
        {
            smtpClient.PickupDirectoryLocation = tempDir.DirectoryPath;
            smtpClient.Send(m);
            var emlFile = Directory.GetFiles(smtpClient.PickupDirectoryLocation).FirstOrDefault();
            if (emlFile != null)
            {
                return File.ReadAllText(emlFile);
            }
            else
                return null;
        }
        return null;
    }

}

class TemporaryDirectory : IDisposable
{
    public TemporaryDirectory()
    {
        DirectoryPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
        Directory.CreateDirectory(DirectoryPath);
    }

    public string DirectoryPath { get; private set; }

    public void Dispose()
    {
        if (Directory.Exists(DirectoryPath))
            Directory.Delete(DirectoryPath, true);
    }
}

調用方法htm

        public void Mime(string mailFrom, string subject, string body, string mailTo)
        { 
            MailMessage message = new MailMessage();
            message.From = new MailAddress(mailFrom, "", Encoding.UTF8);
            message.To.Add(new MailAddress(mailTo));
            message.Subject = subject;
            message.SubjectEncoding = Encoding.UTF8;////主題編碼
            message.Body = body;// "<html><body><h1>Welcome</h1><br>This is an HTML message for outofmemory.cn.</body></html>";
            message.IsBodyHtml = true;
            message.BodyEncoding = Encoding.UTF8;//郵件內容編碼
            message.Priority = MailPriority.High;//優先級
             
            //string str=MailMessageToEml(message);
            string ems = MailMessageExtensions.RawMessage(message);
        }

結果真是使人興奮，對比而言選擇方案一，至於爲何……看看代碼就曉得了！blog

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