C#操作QQ郵箱發送電子郵件原來這么簡單。。。。

　　在貼代碼之前，首先需要給QQ郵箱開服務IMAP/SMTP服務，詳細開通方法見 "開通方法"(可能需要發送收費短信，所以只要開通這一個服務就好了)。

這邊主要就是為了一個服務的授權碼，如下圖：

                  

服務開好之后，直接上代碼了（一個郵件幫助類）：

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;//發件人密碼  
        /// <summary>  
        /// 設置MailMessage的實例
        /// </summary>  
        /// <param name="To">收件人地址</param>  
        /// <param name="From">發件人地址</param>  
        /// <param name="Body">郵件正文</param>  
        /// <param name="Title">郵件的主題</param>  
        /// <param name="Password">發件人密碼</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);//實例化附件  
                disposition = data.ContentDisposition;
                disposition.CreationDate = System.IO.File.GetCreationTime(path[i]);//獲取附件的創建日期  
                disposition.ModificationDate = System.IO.File.GetLastWriteTime(path[i]);//獲取附件的修改日期  
                disposition.ReadDate = System.IO.File.GetLastAccessTime(path[i]);//獲取附件的讀取日期  
                mailMessage.Attachments.Add(data);//添加到附件中  
            }
        }
        /// <summary>  
        /// 異步發送郵件  
        /// </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層 (SSL) 加密連接,必須在實例身份前面設置
                smtpClient.UseDefaultCredentials = false;  
                smtpClient.Credentials = new System.Net.NetworkCredential(mailMessage.From.Address, password);//設置發件人身份的票據  
                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                smtpClient.Host = "smtp." + mailMessage.From.Host;
                smtpClient.SendCompleted += new SendCompletedEventHandler(CompletedMethod);//注冊異步發送郵件完成時的事件  
                smtpClient.SendAsync(mailMessage, mailMessage.Body);
            }
        }
        /// <summary>  
        /// 發送郵件  
        /// </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層 (SSL) 加密連接,必須在實例身份前面設置
                    smtpClient.UseDefaultCredentials = false;    
                    smtpClient.Credentials = new System.Net.NetworkCredential(mailMessage.From.Address, password);//設置發件人身份的票據            
                    smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                    smtpClient.Host = "smtp." + mailMessage.From.Host;
                    smtpClient.Send(mailMessage);
                    mailMessage.Attachments.Dispose();
                }
            }
        }
    }
}

　　調用方法如下：

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

namespace Mail
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] toArr = { "[e-mail]" };
            var sbSql=new System.Text.StringBuilder();
            sbSql.Append("hauge無敵是多么的寂寞");
            SendMail sendmail = new SendMail(toArr, "[e-mail]", sbSql.ToString(), "測試", "QQ郵箱服務授權碼");
            sendmail.Send();           
        }
    }
}

　這邊的QQ郵箱服務授權碼，就是上面開通的IMAP/SMTP服務的16位授權碼。