7.dotnet core 如何發郵件

需要用到的Nuget包 

"MailKit": "1.8.1",

方法

  /// <summary>
        /// 發送郵件(支持Html發送，支持添加一個附件)
        /// </summary>
        /// <param name="subject">郵件標題</param>
        /// <param name="email">收件人地址</param>
        /// <param name="content">郵件內容</param>
        /// <param name="filepath">文件的相對路徑</param>
        public static void SendEmail(string subject, string email,string content,string filepath=null)
        {
            var message = new MimeMessage();
            //發信人
            message.From.Add(new MailboxAddress("發信人姓名", "發信人郵箱"));
            //收信人
            message.To.Add(new MailboxAddress("", email));
            //標題
            message.Subject = subject;
            //產生一個支持Html的TextPart
            var body = new TextPart(TextFormat.Html)
            {
                Text = content
            };
            //先產生一個
            var multipart = new Multipart("mixed");
            //添加正文內容
            multipart.Add(body);
            if (!string.IsNullOrWhiteSpace(filepath))
            {
                //生產一個絕對路徑
                //filepath = "Upload//NewsPhoto//readme.txt";
                var absolutePath = Path.Combine(_hostingEnv.WebRootPath, string.Format(filepath));
                //附件
                var attachment = new MimePart()
                {
                    //讀取文件(只能用絕對路徑)
                    ContentObject = new ContentObject(File.OpenRead(absolutePath), ContentEncoding.Default),
                    ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                    ContentTransferEncoding = ContentEncoding.Base64,
                    //文件名字
                    FileName = Path.GetFileName(absolutePath)
                };
                //添加附件
                multipart.Add(attachment);
            }    
            //正文內容
            message.Body = multipart;
            using (var client = new SmtpClient())
            {
                //連接到Smtp伺服器
                client.Connect("smtp伺服器地址", 埠, false);
                //登陸
                client.Authenticate("賬號", "密碼");
                //發送
                client.Send(message);
                //斷開
                client.Disconnect(true);
            }
        }

以上的這個方法可以發Html的文本並附帶附件