Преобразование MailMessage в MemoryStream в ядре.net

Question

Я использую.Net Core 1.2 с Amazon SES(SimpleEmail) для отправки электронных писем (Raw Emails).

Ниже приведена рабочая версия кода, которую мы использовали в.net Framework 4.5:

   public MemoryStream ConvertMailMessageToMemoryStream(MailMessage message)
    {
        Assembly assembly = typeof(SmtpClient).Assembly;

        Type mailWriterType = assembly.GetType("System.Net.Mail.MailWriter");

        MemoryStream fileStream = new MemoryStream();

        ConstructorInfo mailWriterContructor = mailWriterType.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(Stream) }, null);

        object mailWriter = mailWriterContructor.Invoke(new object[] { fileStream });

        MethodInfo sendMethod = typeof(MailMessage).GetMethod("Send", BindingFlags.Instance | BindingFlags.NonPublic);

        sendMethod.Invoke(message, BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { mailWriter, true, true }, null);

        MethodInfo closeMethod = mailWriter.GetType().GetMethod("Close", BindingFlags.Instance | BindingFlags.NonPublic);

        closeMethod.Invoke(mailWriter, BindingFlags.Instance | BindingFlags.NonPublic, null, new object[] { }, null);

        return fileStream;

    }

Но в.Net Core 1.2 мы не можем получить ссылку на класс Assembly SmtpClient и System.Net.Mail.MailWriter. Ниже работает в обычном.net Framework:

Assembly assembly = typeof(SmtpClient).Assembly;

В.Net Core, поскольку SmtpClient доступен в MailKit, мы ссылаемся на него и выдаем следующую ошибку:

'Type' does not contain a definition for 'Assembly' and no extension method 'Assembly' accepting a first argument of type 'Type' could be found (are you missing a using directive or an assembly reference?)

Есть ли способ в.Net Core для преобразования MailMessage в MemoryStream?

Answer 1

Похоже, что в dotnet core 5.0 нет конструктора, принимающего только один аргумент, попробуйте это.

      ConstructorInfo mailWriterContructor = mailWriterType.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(Stream), typeof(bool) }, null);

    object mailWriter = mailWriterContructor.Invoke(new object[] { fileStream,true });

Answer 2

** попробуй это**

 private static string ConvertMailMessageToMemoryStream(MailMessage message)
    {
        BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
        Assembly assembly = typeof(SmtpClient).Assembly;
        Type mailWriterType = assembly.GetType("System.Net.Mail.MailWriter");
        MemoryStream stream = new MemoryStream();
        ConstructorInfo mailWriterConstructor = mailWriterType.GetConstructor(flags, null, new[] { typeof(Stream) }, null);
        object mailWriter = mailWriterConstructor.Invoke(new object[] { stream });
        MethodInfo sendMethod = typeof(MailMessage).GetMethod("Send", flags);
        sendMethod.Invoke(message, flags, null, new[] { mailWriter, true, true }, null);
        var sr = new StreamReader(stream);
        var str = sr.ReadToEnd();
        MethodInfo closeMethod = mailWriter.GetType().GetMethod("Close", flags);
        closeMethod.Invoke(mailWriter, flags, null, new object[] { }, null);
        return str;
    }