Library.System/Common.Library/Email/SendEmail.cs

using System.Net.Mail;
using System.Collections.Generic;
using System;
using Microsoft.Extensions.Configuration;
using System.Linq;

namespace Common.Library.Email
{
    public class SendEmail
    {
        private EmailConfig _config;

        public SendEmail(EmailConfig config)
        {
            _config = config;
        }

        public void Send()
        {
            MailMessage message = null;

            try
            {
                message = GetMessage();
                SmtpClient mailClient = new(_config.SMTPServer, _config.SMTPServerPort);

                mailClient.Send(message);
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                if(message != null)
                {
                    message.Dispose();
                }
            }
        }

        public void Send(EmailConfig config)
        {
            _config = config;
            Send();
        }

        private MailMessage GetMessage()
        {
            MailMessage message = new()
            {
                Subject = _config.Subject,
                Body = _config.Body,
                From = new(_config.From),
                IsBodyHtml = _config.IsHtml
            };

            message.AddTo(_config.To);
            message.AddCC(_config.CC);
            message.AddBCC(_config.BCC);

            return message;
        }
    }

    public class EmailConfig
    {
        public string From { get; set; }
        public List<string> To { get; set; }
        public List<string> BCC { get; set; }
        public List<string> CC { get; set; }
        public string Subject { get; set; }
        public string Body { get; set; }
        public bool IsHtml { get; set; }
        public string SMTPServer { get; set; }
        public int SMTPServerPort { get; set; }
        public static EmailConfig GetEmailConfig(IConfiguration configuration)
        {
            return new()
            {
                To = configuration?.GetSection("Email:To").Get<List<string>>(),
                BCC = configuration?.GetSection("Email:BCC").Get<List<string>>(),
                CC = configuration?.GetSection("Email:CC").Get<List<string>>(),
                Subject = configuration?.GetSection("Email")["Subject"],
                IsHtml = bool.Parse(configuration?.GetSection("Email")["IsHtml"]),
                SMTPServer = configuration?.GetSection("Email")["SMTPServer"],
                SMTPServerPort = int.Parse(configuration?.GetSection("Email")["SMTPServerPort"])
            };
        }

    }
}