Gmail api with .Net CLient library: Missing draft message [400]

Question

I\'m trying to create drafts in Gmail using the .Net Client Library. I can successfully login and retrieve a list of drafts so the authentication and api are working. Now I

Answer 1

I was struggling with this until today.

What I did was adapting the solution on this link for drafts. http://jason.pettys.name/2014/10/27/sending-email-with-the-gmail-api-in-net-c/

Jason uses a nuget called AE.Net.Mail to serialize an mail object to RFC 2822.

what I did was I installed both nugets

Install-Package Google.Apis.Gmail.v1
Install-Package AE.Net.Mail

And after that I created two methods

static GmailService Service;
    public static void CriaService(string emailaConectar)
    {
        var certificate = new X509Certificate2(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, ClientCredentials.CertificatePath), ClientCredentials.ClientSecret, X509KeyStorageFlags.Exportable);

        var credential = new ServiceAccountCredential(
            new ServiceAccountCredential.Initializer(ClientCredentials.ServiceAccountEmail)
            {
                Scopes = new[] { GmailService.Scope.GmailCompose },
                User = emailaConectar
            }.FromCertificate(certificate)) { };

        Service = new GmailService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = ClientCredentials.ApplicationName,
        });
    }

    private static string Base64UrlEncode(string input)
    {
        var inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
        // Special "url-safe" base64 encode.
        return Convert.ToBase64String(inputBytes)
          .Replace('+', '-')
          .Replace('/', '_')
          .Replace("=", "");
    }

And on my Main method I designed like this

        CriaService("xpto@gmail.com");

        var msg = new AE.Net.Mail.MailMessage
        {
            Subject = "Your Subject",
            Body = "Hello, World, from Gmail API!",
            From = new MailAddress("xpto@gmail.com")
        };
        msg.To.Add(new MailAddress("someone@gmail.com"));
        msg.ReplyTo.Add(msg.From); 
        var msgStr = new StringWriter();
        msg.Save(msgStr);

        Message m = new Message();
        m.Raw = Base64UrlEncode(msgStr.ToString());

        var draft = new Draft();
        draft.Message = m;

        try
        {
            Service.Users.Drafts.Create(draft, "xpto@opportunity.com.br").Execute();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }