C# send email implementation code

I have never done the function of sending emails before. I needed it for a project some time ago. After looking for many posts, I finally realized it.

After that, I sorted it out and wrote a class. Pass information directly to the class and it can be sent.

It should also be noted here that sending emails requires opening the POP3/SMTP service, otherwise QQ mailboxes, NetEase mailboxes, etc. will report errors. There is no need to activate the receiving email address. You can find out how to activate it on Baidu.

public static class EmailHelper
  {
    /// <summary>
    /// 发送邮件
    /// </summary>
    /// <param name="subject">邮件主题</param>
    /// <param name="msg">邮件内容</param>
    /// <param name="filePath">附件地址，如果不添加附件传null或""</param>
    /// <param name="senderEmail">发送人邮箱地址</param>
    /// <param name="senderPwd">发送人邮箱密码</param>
    /// <param name="recipientEmail">接收人邮箱</param>
    public static void SendMail(string subject, string msg, string filePath, string senderEmail, string senderPwd, params string[] recipientEmail)
    {
      if (!CheckIsNotEmptyOrNull(subject, msg, senderEmail, senderPwd) || recipientEmail == null || recipientEmail.Length == 0)
      {
        throw new Exception("输入信息无效");
      }
      try
      {
        string[] sendFromUser = senderEmail.Split(&#39;@&#39;);
 
        //构造一个Email的Message对象
        MailMessage message = new MailMessage();
 
        //确定smtp服务器地址。实例化一个Smtp客户端
        System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient("smtp." + sendFromUser[1]);
 
        //构造发件人地址对象
        message.From = new MailAddress(senderEmail, sendFromUser[0], Encoding.UTF8);
 
        //构造收件人地址对象
        foreach (string userName in recipientEmail)
        {
          message.To.Add(new MailAddress(userName, userName.Split(&#39;@&#39;)[0], Encoding.UTF8));
        }
 
        if (!string.IsNullOrEmpty(filePath))
        {
          Attachment attach = new Attachment(filePath);
          //得到文件的信息
          ContentDisposition disposition = attach.ContentDisposition;
          disposition.CreationDate = System.IO.File.GetCreationTime(filePath);
          disposition.ModificationDate = System.IO.File.GetLastWriteTime(filePath);
          disposition.ReadDate = System.IO.File.GetLastAccessTime(filePath);
          //向邮件添加附件
          message.Attachments.Add(attach);
        }
 
        //添加邮件主题和内容
        message.Subject = subject;
        message.SubjectEncoding = Encoding.UTF8;
        message.Body = msg;
        message.BodyEncoding = Encoding.UTF8;
 
        //设置邮件的信息
        client.DeliveryMethod = SmtpDeliveryMethod.Network;
        message.BodyEncoding = System.Text.Encoding.UTF8;
        message.IsBodyHtml = false;
 
        //如果服务器支持安全连接，则将安全连接设为true。
        //gmail,qq支持，163不支持
        switch (sendFromUser[1])
        {
          case "gmail.com":
          case "qq.com":
            client.EnableSsl = true;
            break;
          default:
            client.EnableSsl = false;
            break;
        }
 
        //设置用户名和密码。
        client.UseDefaultCredentials = false;
        //用户登陆信息
        NetworkCredential myCredentials = new NetworkCredential(senderEmail, senderPwd);
        client.Credentials = myCredentials;
        //发送邮件
        client.Send(message);
      }
      catch (Exception ex)
      {
        throw (ex);
      }
    }
 
    /// <summary>
    /// 验证所有传入字符串不能为空或null
    /// </summary>
    /// <param name="ps">参数列表</param>
    /// <returns>都不为空或null返回true，否则返回false</returns>
    public static bool CheckIsNotEmptyOrNull(params string[] ps)
    {
      if (ps != null)
      {
        foreach (string item in ps)
        {
          if (string.IsNullOrEmpty(item)) return false;
        }
        return true;
      }
      return false;
    }
  }

Call the method directly, pass the information that needs to be sent, and then you can send the email.

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