using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Net.Mail;

using System.Net;

using System.Threading;

using System.IO;

using System.Security.Cryptography;

namespace ConsoleApp348

{

    class Program

    {

        static string logFullPath = Directory.GetCurrentDirectory() + "\\" + DateTime.Now.ToString("yyyyMMdd") + ".txt";

        static void Main(string[] args)

        {

            Timer emailTimer = new Timer(SendMailCallBack, null, , );

            Console.ReadLine();

        }

        private static void SendMailCallBack(object state)

        {

            string fromMail = "fromMail";

            string fromMailPwd = "fromMailPwd";

            string toMail = "toMail";

            MailExample(fromMail, fromMailPwd, toMail);

        }

        static void MailExample(string fromEmail, string fromEmailPwd, string toEmail)

        {

            try

            {

                using (SmtpClient smtpClient = new SmtpClient())

                {

                    smtpClient.Host = "smtp.163.com";

                    smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;

                    smtpClient.UseDefaultCredentials = false;

                    smtpClient.Credentials = new System.Net.NetworkCredential(fromEmail, fromEmailPwd);

                    using (MailMessage mail = new MailMessage())

                    {

                        mail.BodyEncoding = UTF8Encoding.UTF8;

                        mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

                        mail.From = new MailAddress(fromEmail);

                        mail.To.Add(new MailAddress(toEmail));

                        mail.Subject = $"This is the new test.Now is {DateTime.Now.ToString("mmssffff")}";

                        mail.Body = $"This is the mail body,And now is {DateTime.Now.ToString("yyyyMMddHHmmssffff")}";

                        smtpClient.SendAsync(mail, $"Frommail:{fromEmail},ToMail:{toEmail},send email successfully!");

                        smtpClient.SendCompleted += SmtpClient_SendCompleted;

                    }

                }

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex.StackTrace);

                LogMessage(ex.StackTrace);

            }

        }

        private static void SmtpClient_SendCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)

        {

            Console.WriteLine(e.UserState);

            LogMessage(e.UserState.ToString());

        }

        static void LogMessage(string msg)

        {

            lock(logFullPath)

            {

                using (StreamWriter logWriterStream = new StreamWriter(logFullPath, true, UTF8Encoding.UTF8))

                {

                    logWriterStream.WriteLine($"Log message :{msg},now is {DateTime.Now.ToString("yyyyMMddHHmmssffff")}");

                }

            }

        }

    }

}