无法使用SendGrid

Question

我正在尝试使用SendGrid我的ASP.NET Core应用程序发送电子邮件,所以我按以下方式配置它:

在ConfigureServices方法内部,我添加了一个Singleton和配置来访问SendGridAPI:

services.AddSingleton<IEmailSender, IEmailSender>();
services.Configure<AuthMessageSenderOptions>(Configuration);

该类AuthMessageSenderOptions是软件配置的一部分:

public class AuthMessageSenderOptions
{
    public string SendGridUser { get; set; }
    public string SendGridKey { get; set; }
}

此类管理SendGrid用户名和密钥.

我创建了一个service实现IEmailSender接口的类,这是实现:

public class EmailSender : IEmailSender
{
    public AuthMessageSenderOptions Options { get; }

    public EmailSender(IOptions<AuthMessageSenderOptions> optionsAccessor)
    {
        Options = optionsAccessor.Value;
    }

    public Task SendEmailAsync(string email, string subject, string message)
    {
        return Execute(Options.SendGridKey, subject, message, email);
    }

    public Task Execute(string apiKey, string subject, string message, string email)
    {
        var client = new SendGridClient(apiKey);

        var msg = new SendGridMessage()
        {
            From = new EmailAddress("foo@gmail.com", "Foo"),
            Subject = subject,
            PlainTextContent = message,
            HtmlContent = message
        };

        msg.AddTo(new EmailAddress(email));

        msg.TrackingSettings = new TrackingSettings
        {
            ClickTracking = new ClickTracking { Enable = false }
        };

        return client.SendEmailAsync(msg);
    }
}

然后在我的Account控制器(用于执行注册和登录)中,我将IEmailSender服务注入构造函数:

public class AccountController : Controller
{
   private readonly IEmailSender _emailSender;

   public AccountController(IEmailSender emailSender)
   {
       _emailSender = emailSender;
   }

当我启动应用程序时,我收到此错误:

System.ArgumentException:'无法为服务类型'Microsoft.AspNetCore.Identity.UI.Services.IEmailSender'实例化实现类型'Microsoft.AspNetCore.Identity.UI.Services.IEmailSender'.

在Program课堂内,特别是在这一行:

CreateWebHostBuilder(args).Build().Run();

这是Program全班:

public class Program
{
    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>();
}

我做错了什么？

我正在学习ASP.NET Core,抱歉如果我做了一些愚蠢的事情,我按照这个文档来实现SendGrid逻辑.

Answer 1

services.AddSingleton<IEmailSender, IEmailSender>();

应该在第二个模板参数中指定实现:

services.AddSingleton<IEmailSender, EmailSender>();