在asp.net core 2.1上使用Hangfire发送电子邮件

Question

I have set up Hangfire correctly. I am able to run the following code from postman:

 [HttpPost("appointments/new")]
 public async Task<IActionResult> SendMailMinutely()
 {
     RecurringJob.AddOrUpdate(() => Console.WriteLine("Recurring!") Cron.Minutely);
     await Task.CompletedTask;
     return Ok();
 }

When I hit this API point, this works fine. What I would like to do is to run my email controller using the same code above. My modified SchedulersController code is:

[Route("/api/[controller]")]
public class SchedulersController : Controller
{
    private readonly MailsController mail;
    public SchedulersController(MailsController mail)
    {
        this.mail = mail;
    }

    [HttpPost("appointments/new")]
    public async Task<IActionResult> SendMailMinutely()
    {
        RecurringJob.AddOrUpdate(() => mail.SendMail(), Cron.Minutely);
        await Task.CompletedTask;
        return Ok();
    }
}

And My MailsController is:

[HttpPost("appointments/new")]
public async Task<IActionResult> SendMail()
 {
    var message = new MimeMessage ();
    message.From.Add (new MailboxAddress ("Test", "test@test.com"));
    message.To.Add (new MailboxAddress ("Testing", "test@test123.com"));
    message.Subject = "How you doin'?";

    message.Body = new TextPart ("plain") {
        Text = @"Hey Chandler,
                I just wanted to let you know that Monica and I were going to go play some paintball, you in?
                -- Joey"
    };

     using (var client = new SmtpClient ()) {
     client.ServerCertificateValidationCallback = (s,c,h,e) => true;

    client.Connect ("smtp.test.edu", 25, false);

    await client.SendAsync (message);
            client.Disconnect (true);
        }


        return Ok();
    }

The error message I receive is:

An unhandled exception has occurred while executing the request. System.InvalidOperationException: Unable to resolve service for type 'Restore.API.Controllers.MailsController' while attempting to activate 'Restore.API.Controllers.SchedulersController'

How can I use my MailsController so that I can schedule emails to send using Hangfire? Any help will be greatly appreciated.

Answer 1

The proper way to do this is to move your mail sending logic into a separate service.

// We need an interface so we can test your code from unit tests without actually emailing people
public interface IEmailService
{
    async Task SendMail();
}

public EmailService : IEmailService
{
    public async Task SendMail()
    {
        // Perform the email sending here
    }
}

[Route("/api/[controller]")]
public class SchedulersController : Controller
{
    [HttpPost("appointments/new")]
    public IActionResult SendMailMinutely()
    {
        RecurringJob.AddOrUpdate<IEmailService>(service => service.SendMail(), Cron.Minutely);
        return Ok();
    }
}

You'll need to make sure you've configured Hangfire for IoC as described in their documentation , so that it can resolve an IEmailService.

Answer 2

This is related to Dependency Injection in the Core Framework. You need to ensure that you register your dependencies in your startup.cs under ConfigureService method.

Not sure if this is good practice though.

For Controller you can use: services.AddMvc().AddControllersAsServices();