C# SmtpClient 发邮件

最新推荐文章于 2025-10-23 09:26:51 发布

转载最新推荐文章于 2025-10-23 09:26:51 发布 · 1.1k 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/Fred1987/p/10903419.html

本文介绍了一个使用C#实现的异步邮件发送功能，通过定时任务定期发送邮件，并在本地记录详细的日志信息。示例代码展示了如何配置SMTP服务器，设置邮件内容，以及使用UTF8编码和异步发送方法。

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, 0, 1);
            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")}");
                }
            }           
        }
    }
}

异步：public void SendAsync(MailMessage message, object userToken);

Sends the specified e-mail message to an SMTP server for delivery. This method does not block the calling thread and allows the caller to pass an object to the method that is invoked when the operation completes.

转载于:https://www.cnblogs.com/Fred1987/p/10903419.html