.net 发邮件的小工具，包含json，环境变量，命令行参数三种配置方式

using Microsoft.Extensions.Configuration; using Newtonsoft.Json; using Newtonsoft.Json.Linq; using System; using System.Net.Mail; using System.Text; namespace gct.sendmail {     public class Program     {         static void Main(string[] args)         {             Console.WriteLine(WriteEmail(args).ToString());         }          public static string WriteEmail(string[] args)         {             IConfiguration configuration = new ConfigurationBuilder().SetBasePath(Environment.CurrentDirectory)                 //json文件                 .AddJsonFile("appsettings.json")                 //系统参数                 .AddCommandLine(args)                 //环境变量                 .AddEnvironmentVariables()                 .Build();              //发送者邮箱             string strMailFrom = GetValue(configuration, "From:strMailFrom", "strMailFrom");             //校验码             string strCode = GetValue(configuration, "From:strCode", "strCode");              //是否Html文件格式             bool isHtml = !string.IsNullOrEmpty(configuration["From:isHtml"])?bool.Parse(configuration["From:isHtml"]) :                 configuration["isHtml"]!=null ? bool.Parse(configuration["isHtml"]) : false;             //邮件服务器             string strEmailServe = GetValue(configuration, "From:strEmailServe", "strEmailServe");             //端口号             int ePort = !string.IsNullOrEmpty(configuration["From:isHtml"])? int.Parse(configuration["From:ePort"]):                 !string.IsNullOrEmpty(configuration["ePort"]) ? int.Parse(configuration["ePort"]) : 25;             //邮件发送名称             string strMailFromName = GetValue(configuration, "From:strMailFromName", "strMailFromName");             string strMailTo = GetValue(configuration, "To:strMailTo", "strMailTo");             if (string.IsNullOrEmpty(strMailTo))             {                 Console.WriteLine("请输入收件人邮箱,以" + ";" + "间隔!");                 strMailTo = Console.ReadLine().ToString();             }             //抄送             string strMailCC = GetValue(configuration, "To:strMailCC", "strMailCC");              //标题             string strMailSubject = GetValue(configuration, "Content:strMailSubject", "strMailSubject");              //正文             string strMailBody = GetValue(configuration, "Content:strMailBody", "strMailBody");               return SendEmail(strMailFrom, strMailTo, strMailCC, strMailSubject, strMailBody, isHtml, strCode, ePort, strEmailServe, strMailFromName);         }         /// <summary>         /// 发送电子邮件         /// </summary>         /// <param name="mailFrom">邮件发送方</param>         /// <param name="mailTo">邮件接收方</param>         /// <param name="mailCC">抄送</param>         /// <param name="mailHead">标题</param>         /// <param name="mailBody">正文</param>         /// <param name="isHtml">指示邮件正文是否为 HTML 格式。</param>         /// <param name="code">校验码</param>         /// <param name="ePort">端口号</param>         /// <param name="emailServe">邮箱服务器</param>         /// <param name="mailFromName">发件人名称</param>         /// <returns></returns>         public static string SendEmail(string mailFrom, string mailTo, string mailCC,             string mailHead, string mailBody, bool isHtml,              string code, int ePort,string emailServe,string mailFromName)         {              MailMessage eMail = new MailMessage();             SmtpClient eClient = new SmtpClient(emailServe, ePort);             eClient.Credentials = new System.Net.NetworkCredential(mailFrom, code);             eClient.EnableSsl = true;             eClient.UseDefaultCredentials = false;             eMail.Subject = mailHead;             eMail.SubjectEncoding = Encoding.UTF8;             eMail.Body = mailBody;             eMail.BodyEncoding = Encoding.UTF8;             eMail.From = new MailAddress(mailFrom, mailFromName,Encoding.UTF8);             string[] arrMailAddr;             try             {                 //用";"分割多个收件人.                 eMail.To.Clear();                 if (!string.IsNullOrEmpty(mailTo))                 {                     arrMailAddr = mailTo.Split(';');                     foreach (string strTo in arrMailAddr)                     {                         if (!string.IsNullOrEmpty(strTo))                         {                             eMail.To.Add(strTo);                         }                     }                 }                  //用";"分割多个抄送人.                 eMail.CC.Clear();                 if (!string.IsNullOrEmpty(mailCC))                 {                     arrMailAddr = mailCC.Split(';');                     foreach (string strCC in arrMailAddr)                     {                         if (!string.IsNullOrEmpty(strCC))                         {                             eMail.CC.Add(strCC);                         }                     }                 }                 if (isHtml)                 {                     eMail.IsBodyHtml = true;                 }                 else                 {                     eMail.IsBodyHtml = false;                 }                  eClient.Send(eMail);                 return "邮件已发送,请查收!";               }             catch (Exception ex)             {                 return "邮件发送失败,原因:" + ex.Message.ToString();             }          }         //获取配置值         public static string GetValue(IConfiguration configuration,string value1,string value2)         {             if (!string.IsNullOrEmpty(configuration[value1]))             {                 return configuration[value1];             }             return configuration[value2];         }     } }

{   "From": {     //发件人邮箱     "strMailFrom": "",     //邮箱服务器，以下是qq邮箱服务器     "strEmailServe": "smtp.qq.com",     //授权码(注意此处，是授权码你需要到qq邮箱里点设置开启Smtp服务，然后会提示你第三方登录时密码处填写授权码)     "strCode": "",     //是否为Html文件形式     "isHtml": "false",     //端口,默认25     "ePort": "25",     //发送者名称     "strMailFromName": ""   },   "To": {     //抄送，多个以英文符号;间隔     "strMailCC": "",     //收件人邮箱，多个以英文符号;间隔     "strMailTo": ""   },   "Content": {     //标题     "strMailSubject": "邮件测试",     //正文内容     "strMailBody": "邮件测试，请勿回复"   } }