使用 Autofac 在构造函数中注入带有 IOptions 的类

Question

我正在使用 Autofac 作为我在另一个控制台应用程序中使用的容器，该控制台应用程序使用与我的主 Web 应用程序相同的对象，并尝试在其构造函数中注入一个具有 IOptions 的类，它的外观如下：

 public class Mailer : IMailer
{
    private readonly StmpSettings _stmpSettings;
    public Mailer(IOptions<StmpSettings> stmpSettings)
    {
        _stmpSettings = stmpSettings.Value;
    }
    public async Task SendEmailAsync(string email, string subject, string body)
    {
        try
        {
            var message = new MimeMessage();
            message.From.Add(new MailboxAddress(_stmpSettings.SenderName, _stmpSettings.SenderEmail));
            message.To.Add(new MailboxAddress(email));
            message.Subject = subject;
            message.Body = new TextPart("html")
            {
                Text = body
            };
            using (var client = new SmtpClient())
            {
                client.ServerCertificateValidationCallback = (s, c, h, e) => true;
                //I am using my own certificate for https. so when trying to connect to google smtp it cannot authenticate the certificate. I used this temp workaround: SecureSocketOptions.Auto.
                //It means that the mail wont be encrypted.
                //https://github.com/jstedfast/MailKit/blob/master/FAQ.md#SslHandshakeExceptionhttps://support.google.com/mail/?p=InvalidSecondFactor look for more secure solutions.

                await client.ConnectAsync(_stmpSettings.Server, _stmpSettings.Port, SecureSocketOptions.Auto);
                await client.AuthenticateAsync(_stmpSettings.Username, _stmpSettings.Password);
                await client.SendAsync(message);
                await client.DisconnectAsync(true);
            }
        }
        catch (Exception e)
        {
            throw e;
        }
    }
}

正如您所见，构造函数正在从注入的 stmpSettings 中获取一些设置，知道如何将其注入 autofac 容器吗？

目前为止

builder.RegisterType<Mailer>().As<IMailer>();

但我还需要包含构造函数注入的东西。 很难理解如何做到这一点，任何帮助将不胜感激！

Answer 1

使用Populate方法可以将服务注册到.Net Core服务注册的Autofac。

创建这样的方法

public static IServiceProvider BuildAutofacServiceProvider(this IServiceCollection services)
{
    var containerBuilder = new ContainerBuilder();
    containerBuilder.Populate(services);
    var container = containerBuilder.Build();
    return new AutofacServiceProvider(container);
}

将ConfigureServices方法的返回类型改为IServiceProvider

public IServiceProvider ConfigureServices(IServiceCollection services)
{
      //register services
    return services.BuildAutofacServiceProvider();
}