如何用C#實現發送郵件

如何用C#實現發送郵件？針對這個問題，這篇文章詳細介紹了相對應的分析和解答，希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。

#region 發送郵件部分
    private static String fromMail = "1111@126.com";  ///郵箱名稱
    private static String mailPwd = "111111";     ///密碼
    private static string toMail = "2222@163.com";  ///郵箱服務器
    private static string fileStr;//當前圖片路徑，在添加附件時用
    /// <summary>
    /// 發送郵件
    /// </summary>
    /// <param name="fileUrl">附件地址，以~分</param>
    /// <param name="screen">是否發送截屏</param>
    /// <returns></returns>
    public static string SendMail(string fileUrl, string screen)
    {
     
      MailAddress from = new MailAddress(fromMail);
      MailAddress to = new MailAddress(toMail);

      MailMessage message = new MailMessage(from, to);
      message.Subject = "M郵件 " +11111;//主題
      message.SubjectEncoding = System.Text.Encoding.UTF8;

      Attachment attachFile = new Attachment(fileStr);
      if (screen == "True")
        message.Attachments.Add(attachFile);

      string[] files = fileUrl.Split('~');
      for (int i = 0; i < files.Length; i++)
      {
        if (File.Exists(files[i]))
        {
          Attachment attachFile1 = new Attachment(fileUrl);
          message.Attachments.Add(attachFile1);
        }
      }

      try
      {
        SmtpClient client = new SmtpClient("smtp." + from.Host);

        SendMail(client, from, mailPwd, to, message);

       
        return "發送郵件成功！包含附件：" + fileUrl + " 含截圖？" + screen + "  " + DateTime.Now.ToString();
      }
      catch (SmtpException ex)
      {
        //如果錯誤原因是沒有找到服務器，則嘗試不加smtp.前綴的服務器
        if (ex.StatusCode == SmtpStatusCode.GeneralFailure)
        {
          try
          {
            //有些郵件服務器不加smtp.前綴
            SmtpClient client = new SmtpClient(from.Host);
            SendMail(client, from, mailPwd, to, message);
          
            return "發送郵件成功！包含附件：" + fileUrl + " 含截圖？" + screen + "  " + DateTime.Now.ToString();

          }
          catch (SmtpException err)
          {
           
            return "發送郵件失敗！" + err.Message + "  " + DateTime.Now.ToString();
          }
        }
        else
        {
         
          return "發送郵件失敗！" + ex.Message + "  " + DateTime.Now.ToString();
        }
      }
    }

    //根據指定的參數發送郵件
    private static void SendMail(SmtpClient client, MailAddress from, string password,
       MailAddress to, MailMessage message)
    {
      //不使用默認憑證,注意此句必須放在client.Credentials的上面
      client.UseDefaultCredentials = false;
      //指定用戶名、密碼
      client.Credentials = new NetworkCredential(from.Address, password);
      //郵件通過網絡發送到服務器
      client.DeliveryMethod = SmtpDeliveryMethod.Network;
      try
      {
        client.Send(message);
      }
      catch
      {
        throw;
      }
      finally
      {
        //及時釋放占用的資源
        message.Dispose();
      }
    }
    #endregion

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