我可以在 ASP.Net Core 3.0 中使用 IEmailSender 接口向多个接收者发送电子邮件吗

Question

I'm beginner to ASP.Net core. Actually I'm using ASP.Net Core 3.0. I want to Send emails to Multiple Receivers. Can I use IEmailSender Interface? Or any suggetion?

My IEmailSender implementation is like,

public class EmailSender : IEmailSender
{
    private string host;
    private int port;
    private bool enableSSL;
    private string userName;
    private string password;

    public EmailSender(string host, int port, bool enableSSL, string userName, string password)
    {
        this.host = host;
        this.port = port;
        this.enableSSL = enableSSL;
        this.userName = userName;
        this.password = password;
    }

    public Task SendEmailAsync(string email, string subject, string htmlMessage)
    {
        var client = new SmtpClient(host, port)
        {
            Credentials = new NetworkCredential(userName, password),
            EnableSsl = enableSSL
        };
        return client.SendMailAsync(
            new MailMessage(userName, email, subject, htmlMessage) { IsBodyHtml = true }
        );
    }
}

Can anyone help me?

Answer 1

The MailMessage.To property is of the type MailAddressCollection . This means, that you can use the Add method to add multiple recipients.

MailMessage message = new MailMessage();
message.To.Add(new MailAddress("email1@evilcorp.com"));
message.To.Add(new MailAddress("email2@evilcorp.com"));

Answer 2

Actually I do it in another way. Ill post it here and it will help for someone..

1. I create new interface called 'IExtendedEmailSender' inheriting the 'IEmailSender' interface.

    public interface IExtendedEmailSender : IEmailSender { }

2. Create new abstract method for send emails to multiple receivers.

    public interface IExtendedEmailSender : IEmailSender { Task SendBulkEmailAsync(string[] emails, string subject, string htmlMessage); }

3. create new method for check mail address.

    public static bool CheckIsValiedEmailAddress(string address) { try { var addr = new System.Net.Mail.MailAddress(address); return addr.Address == address; } catch { return false; } }

4. Create new class calling 'EmailSender' and implement the 'IExtendedEmailSender' interface.

    public class EmailSender : IExtendedEmailSender { private string host; private int port; private bool enableSSL; private string userName; private string password; public EmailSender(string host, int port, bool enableSSL, string userName, string password) { this.host = host; this.port = port; this.enableSSL = enableSSL; this.userName = userName; this.password = password; } public Task SendEmailAsync(string email, string subject, string htmlMessage) { var client = new SmtpClient(host, port) { Credentials = new NetworkCredential(userName, password), EnableSsl = enableSSL }; return client.SendMailAsync( new MailMessage(userName, email, subject, htmlMessage) { IsBodyHtml = true } ); } public Task SendBulkEmailAsync(string[] emails, string subject, string htmlMessage) { var client = new SmtpClient(host, port) { Credentials = new NetworkCredential(userName, password), EnableSsl = enableSSL }; MailMessage mailMessage = new MailMessage(); mailMessage.Body = htmlMessage; mailMessage.IsBodyHtml = true; mailMessage.Subject = subject; foreach (string emailAdress in emails) { if (CheckIsValiedEmailAddress(emailAdress)) mailMessage.To.Add(emailAdress); } return client.SendMailAsync(mailMessage); ; } }

5. Finally All instances of 'IEmailSender' replace to 'IExtendedEmailSender'.

Answer 3

 if (email != null && !string.IsNullOrEmpty(email.Trim()))
        {
            var lst = new List<string>(
                (email + "").Split(';').Select(tag => tag.Trim()).Where(tag => !string.IsNullOrEmpty(tag)));
            foreach (var s in lst)
                msg.AddTo(s);
        }