[开发工具].NET Core MailKit Email 邮件发送

什么是授权码，它又是如何设置？_QQ邮箱帮助中心

MailKit是流行且强大的.NET邮件处理框架

1、NET Core
管理 NuGet 程序包(N)...

MailKit

1、MailHelper.cs

using MimeKit;
using Config;
using Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Talk.Extensions;

namespace CoreLibrary
{
    public static class MailHelper
    {
        public static async Task<bool> SendMail(string title, string content, MailRequest mailInfo = null)
        {
            if (mailInfo == null)
            {
                mailInfo = await FileConfig.GetMailInfoAsync();
                if (mailInfo.MailPwd.IsNullOrWhiteSpace() ||
                    mailInfo.MailFrom.IsNullOrWhiteSpace() ||
                    mailInfo.MailHost.IsNullOrWhiteSpace())
                {
                    throw new Exception("请先在 [/seting] 页面配置邮箱设置。");
                }
            }

            var message = new MimeMessage();
            message.From.Add(new MailboxAddress(mailInfo.MailFrom, mailInfo.MailFrom));
            foreach (var mailTo in mailInfo.MailTo.Replace("；", ";").Replace("，", ";").Replace(",", ";").Split(';'))
            {
                message.To.Add(new MailboxAddress(mailTo, mailTo));
            }
            message.Subject = string.Format(title);
            message.Body = new TextPart("html")
            {
                Text = content
            };
            using (var client = new MailKit.Net.Smtp.SmtpClient())
            {
                await client.ConnectAsync(mailInfo.MailHost, 465, true);
                await client.AuthenticateAsync(mailInfo.MailFrom, mailInfo.MailPwd);
                await client.SendAsync(message);
                await client.DisconnectAsync(true);
            }
            return true;
        }

        public static async Task<bool> SendMail(string title, string content, string mailTo)
        {
            var info = await FileConfig.GetMailInfoAsync();
            if (info.MailPwd.IsNullOrWhiteSpace() || info.MailFrom.IsNullOrWhiteSpace() || info.MailHost.IsNullOrWhiteSpace())
                throw new Exception("请先在 [/seting] 页面配置邮箱设置。");
            info.MailTo = mailTo;
            return await SendMail(title, content, info);
        }
    }
}

2、FileConfig.cs

using Models;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Config
{
    public static class FileConfig
    {
        private static string filePath = "File/Mail.txt";

        private static MailRequest mailData = null;
        public static async Task<MailRequest> GetMailInfoAsync()
        {
            if (mailData == null)
            {
                if (!System.IO.File.Exists(filePath)) return new MailRequest();
                var mail = await System.IO.File.ReadAllTextAsync(filePath);
                mailData = JsonConvert.DeserializeObject<MailRequest>(mail);
            }
            //深度复制，调用方修改。
            return JsonConvert.DeserializeObject<MailRequest>(JsonConvert.SerializeObject(mailData));
        }

        public static async Task<bool> SaveMailInfoAsync(MailRequest MailRequest)
        {
            mailData = MailRequest;
            await System.IO.File.WriteAllTextAsync(filePath, JsonConvert.SerializeObject(MailRequest));
            return true;
        }
    }
}

3、MailRequest.cs

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

namespace Models
{
    public class MailRequest
    {
        /// <summary>
        /// 发件邮箱
        /// </summary>
        public string MailFrom { get; set; }
        /// <summary>
        /// 邮箱密码
        /// </summary>
        public string MailPwd { get; set; }
        /// <summary>
        /// 发件服务器
        /// </summary>
        public string MailHost { get; set; }
        /// <summary>
        /// 收件邮箱
        /// </summary>
        public string MailTo { get; set; }
    }

    public class SendMailRequest
    {
        public string Title { get; set; }
        public string Content { get; set; }
        public MailRequest MailInfo { get; set; } = null;
    }
}

4、Constant.cs

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

namespace Config
{
    public class Constant
    {
        public const string MailTitle = "提示";
        public const string MailContent = "MailContent";
        public const string MailFrom = "123456789@qq.com";
        public const string MailTo = "987654321@qq.com";
        public const string MailPassword = "授权码，不是QQ邮箱密码";
        public const string MailHost = "smtp.qq.com";
    }
}

5、EmailController.cs

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Config;
using CoreLibrary;
using Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebAPI.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class EmailController : ControllerBase
    {
        public EmailController()
        { }

        /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        [HttpPost]
        public async Task<bool> SendMail([FromBody] SendMailRequest model)
        {
            model.MailInfo.MailFrom = Constant.MailFrom;
            model.MailInfo.MailPwd = Constant.MailPassword;
            model.MailInfo.MailHost = Constant.MailHost;
            model.MailInfo.MailTo = Constant.MailTo;

            return await MailHelper.SendMail(model.Title, model.Content, model.MailInfo);
        }
    }
}

*
========= NET Framework =========
1、EmailHelper.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Linq;
using System.Net.Mail;
using System.Reflection;
using System.ServiceModel;
using System.Text;

namespace CoreLibrary
{
    public class EmailHelper
    {
        /// <summary>
        /// 邮件发送
        /// </summary>
        /// <param name="Mail_ad">收件人</param>
        /// <param name="Mail_cc">抄送人</param>
        /// <param name="title">标题</param>
        /// <param name="msg">内容</param>
        /// <param name="files">附件</param>
        public void SendEmail(List<string> Mail_ad, List<string> Mail_cc, string title, string msg, List<string> files)
        {
            string FromAddress = ConfigurationManager.AppSettings["FromAddress"];
            string Password = ConfigurationManager.AppSettings["FromPassword"];
            string Sender = ConfigurationManager.AppSettings["FromSender"];
            string SmtpHost = ConfigurationManager.AppSettings["SmtpHost"];
            string SmtpPort = ConfigurationManager.AppSettings["SmtpPort"];

            MailAddress from = new MailAddress(FromAddress, Sender);
            SmtpClient client = new SmtpClient(SmtpHost, Convert.ToInt32(SmtpPort));
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential(FromAddress, Password);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.EnableSsl = true;

            if (Mail_ad != null && Mail_ad.Count > 0)
            {
                for (int i = 0; i < Mail_ad.Count; i++)
                {
                    MailMessage message = new MailMessage();
                    message.From = from;
                    message.To.Add(Mail_ad[i].ToString());
                    if (Mail_cc != null && Mail_cc.Count > 0 && i == 0)
                    {
                        foreach (string item in Mail_cc)
                            message.CC.Add(item);
                    }
                    message.Subject = title;
                    message.Body = msg;
                    message.BodyEncoding = System.Text.Encoding.Default;
                    message.IsBodyHtml = true;
                    message.Attachments.Clear();
                    if (files != null && files.Count != 0)
                    {
                        decimal total = 0;
                        foreach (string item in files)
                        {
                            System.IO.FileInfo file = new System.IO.FileInfo(item);
                            total += file.Length / 1024;
                        }
                        if (total > 1024)
                            throw new FaultException("The file is too large.");
                        else
                        {
                            foreach (string item in files)
                            {
                                Attachment attach = new Attachment(item);
                                message.Attachments.Add(attach);
                            }
                        }
                    }
                    try
                    {
                        log4net.ILog logger = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
                        logger.Info("Entered SendEmail");
                        client.Send(message);
                    }
                    catch (Exception ex)
                    {
                        log4net.ILog logger = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
                        logger.Error(ex.ToString());
                    }
                    finally
                    {
                        message.Dispose();
                    }
                }
            }
            else
                throw new ArgumentNullException();
        }
    }
}

2、调用

public void SendEmailByMessage()
{
    StringBuilder contents = new StringBuilder();
    string title = string.Empty;
    string address = string.Empty;
    SendMail(title, contents.ToString(), address);
}

private void SendMail(string title, string content, string address)
{
    EmailHelper eh = new EmailHelper();
    List<string> files = new List<string>();
    List<string> mail_ad = new List<string>();
    List<string> mail_cc = null;
    string cc = ConfigurationManager.AppSettings["ToCC"];
    if (!string.IsNullOrEmpty(address))
        mail_ad.Add(address);
    if (!string.IsNullOrEmpty(cc))
        mail_cc = cc.Split(new char[] { ',' }).Distinct().ToList();
    eh.SendEmail(mail_ad, mail_cc, title, content, files);
}

=========邮箱设置=========
什么是授权码，它又是如何设置？_QQ邮箱帮助中心

1、邮箱设置
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2、邮箱设置 - 账户

3、POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务

4、授权码

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*
*
*
*

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