Creating a Message for Gmail API in C#

Question

I\'m looking at using the Gmail API in an application I\'m working on. However, I\'m not sure how to change their Java or Python examples over to C#. How exactly does the ex

Answer 1

This was a tricky problem to solve, but I did end up getting it. I used the NuGet package AE.Net.Mail to get the RFC 2822 bit.

using System.IO;
using System.Net.Mail;
using Google.Apis.Gmail.v1;
using Google.Apis.Gmail.v1.Data;

public class TestEmail {

  public void SendIt() {
    var msg = new AE.Net.Mail.MailMessage {
      Subject = "Your Subject",
      Body = "Hello, World, from Gmail API!",
      From = new MailAddress("[you]@gmail.com")
    };
    msg.To.Add(new MailAddress("yourbuddy@gmail.com"));
    msg.ReplyTo.Add(msg.From); // Bounces without this!!
    var msgStr = new StringWriter();
    msg.Save(msgStr);

    var gmail = new GmailService(MyOwnGoogleOAuthInitializer);
    var result = gmail.Users.Messages.Send(new Message {
      Raw = Base64UrlEncode(msgStr.ToString())
    }, "me").Execute();
    Console.WriteLine("Message ID {0} sent.", result.Id);
  }

  private static string Base64UrlEncode(string input) {
    var inputBytes = System.Text.Encoding.UTF8.GetBytes(input);
    // Special "url-safe" base64 encode.
    return Convert.ToBase64String(inputBytes)
      .Replace('+', '-')
      .Replace('/', '_')
      .Replace("=", "");
  }
}

Same code with a little further analysis and reasons are posted here: http://jason.pettys.name/2014/10/27/sending-email-with-the-gmail-api-in-net-c/