C#操作QQ邮箱发送电子邮件原来这么简单。。。。

　　在贴代码之前，首先需要给QQ邮箱开服务IMAP/SMTP服务，详细开通方法见 "开通方法"(可能需要发送收费短信，所以只要开通这一个服务就好了)。

这边主要就是为了一个服务的授权码，如下图：

                  

服务开好之后，直接上代码了（一个邮件帮助类）：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
using System.Net.Mime;
using System.Text;

namespace Mail
{
    public class SendMail
    {
        private MailMessage mailMessage;
        private SmtpClient smtpClient;
        private string password;//发件人密码  
        /// <summary>  
        /// 设置MailMessage的实例
        /// </summary>  
        /// <param name="To">收件人地址</param>  
        /// <param name="From">发件人地址</param>  
        /// <param name="Body">邮件正文</param>  
        /// <param name="Title">邮件的主题</param>  
        /// <param name="Password">发件人密码</param>  
        public SendMail(string[] To, string From, string Body, string Title, string Password)
        {
            mailMessage = new MailMessage();
            foreach (var item in To)
            {
                mailMessage.To.Add(item);
            }
            mailMessage.From = new System.Net.Mail.MailAddress(From);
            mailMessage.Subject = Title;
            mailMessage.Body = Body;
            mailMessage.IsBodyHtml = true;
            mailMessage.BodyEncoding = System.Text.Encoding.UTF8;
            mailMessage.Priority = System.Net.Mail.MailPriority.Normal;
            this.password = Password;
        }
        /// <summary>  
        /// 添加附件  
        /// </summary>  
        public void Attachments(string Path)
        {
            string[] path = Path.Split(',');
            Attachment data;
            ContentDisposition disposition;
            for (int i = 0; i < path.Length; i++)
            {
                data = new Attachment(path[i], MediaTypeNames.Application.Octet);//实例化附件  
                disposition = data.ContentDisposition;
                disposition.CreationDate = System.IO.File.GetCreationTime(path[i]);//获取附件的创建日期  
                disposition.ModificationDate = System.IO.File.GetLastWriteTime(path[i]);//获取附件的修改日期  
                disposition.ReadDate = System.IO.File.GetLastAccessTime(path[i]);//获取附件的读取日期  
                mailMessage.Attachments.Add(data);//添加到附件中  
            }
        }
        /// <summary>  
        /// 异步发送邮件  
        /// </summary>  
        /// <param name="CompletedMethod"></param>  
        public void SendAsync(SendCompletedEventHandler CompletedMethod)
        {
            if (mailMessage != null)
            {
                smtpClient = new SmtpClient();
                smtpClient.EnableSsl = true;// 指定 System.Net.Mail.SmtpClient 是否使用安全套接字层 (SSL) 加密连接,必须在实例身份前面设置
                smtpClient.UseDefaultCredentials = false;  
                smtpClient.Credentials = new System.Net.NetworkCredential(mailMessage.From.Address, password);//设置发件人身份的票据  
                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                smtpClient.Host = "smtp." + mailMessage.From.Host;
                smtpClient.SendCompleted += new SendCompletedEventHandler(CompletedMethod);//注册异步发送邮件完成时的事件  
                smtpClient.SendAsync(mailMessage, mailMessage.Body);
            }
        }
        /// <summary>  
        /// 发送邮件  
        /// </summary>  
        public void Send()
        {
            if (mailMessage != null)
            {
                using (smtpClient = new SmtpClient())
                {
                    smtpClient.EnableSsl = true;// 指定 System.Net.Mail.SmtpClient 是否使用安全套接字层 (SSL) 加密连接,必须在实例身份前面设置
                    smtpClient.UseDefaultCredentials = false;    
                    smtpClient.Credentials = new System.Net.NetworkCredential(mailMessage.From.Address, password);//设置发件人身份的票据            
                    smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                    smtpClient.Host = "smtp." + mailMessage.From.Host;
                    smtpClient.Send(mailMessage);
                    mailMessage.Attachments.Dispose();
                }
            }
        }
    }
}

　　调用方法如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Mail
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] toArr = { "1234567890@qq.com" };
            var sbSql=new System.Text.StringBuilder();
            sbSql.Append("hauge无敌是多么的寂寞");
            SendMail sendmail = new SendMail(toArr, "0123456789@qq.com", sbSql.ToString(), "测试", "QQ邮箱服务授权码");
            sendmail.Send();           
        }
    }
}

　这边的QQ邮箱服务授权码，就是上面开通的IMAP/SMTP服务的16位授权码。