C#Net核心系统。InvalidOperationException：无法解析[重复]类型的服务

Question

我有以下错误，我无法开始这门课，我想请你帮我解决它。

错误：

系统InvalidOperationException：无法解析“IcarusOnlineAPI”类型的服务。服务。电子邮件试图激活“IcarusOnlineAPI”时发送电子邮件。控制器。授权。AuthController’。在微软。扩展。依赖注入。ActivatorUtilities。Microsoft lambda\u method10（闭包，IServiceProvider，Object[]）的GetService（IServiceProvider sp，Type Type，Type requiredBy，Boolean isDefaultParameterRequired）。AspNetCore。Mvc。控制器。ControllerActivatorProvider。

    -Constructor Class--
    private readonly ICARUS_Login_DatabaseContext _loginContext;
    private readonly ICARUS_User_DatabaseContext _userContext;
    private readonly ICARUS_Char_DatabaseContext _charContext;
    private readonly WEBContext _webcontext;
    private readonly ILogger<AuthController> _logger;
    private readonly SendEmail _sendEmail;

    public AuthController(ILogger<AuthController> logger, 
        ICARUS_Login_DatabaseContext loginContext,
        ICARUS_User_DatabaseContext userContext, 
        ICARUS_Char_DatabaseContext charContext, 
        WEBContext webcontext,
        SendEmail sendEmail
        )
    {
        _loginContext = loginContext;
        _userContext = userContext;
        _charContext = charContext;
        _webcontext = webcontext;
        _logger = logger;
        _sendEmail = sendEmail;
    }

-- Send Email Class-


   using IcarusOnlineAPI.MailSender;
   using Microsoft.AspNetCore.Hosting;
   using Microsoft.Extensions.Configuration;
   using System.IO;
   using System.Threading.Tasks;

namespace IcarusOnlineAPI.Services.Email
{
    public class SendEmail
    {
        private readonly IWebHostEnvironment _env;
        private readonly AadGraphApiDelegatedClient _aadGraphApiDelegatedClient;
        private readonly IConfiguration _configuration;

        public SendEmail(IWebHostEnvironment env,
            AadGraphApiDelegatedClient aadGraphApiDelegatedClient,
            IConfiguration configuration)
        {
            _env = env;
            _aadGraphApiDelegatedClient = aadGraphApiDelegatedClient;
            _configuration = configuration;
        }

        public async Task SendRecoverAccountEmail(string Login, string Email, string Token)
        {
            await Task.Delay(10000);

            var emailTemplate = File.ReadAllText
                (Path.Combine(_env.WebRootPath, "EmailTemplates/RecoverAccount.html"));

            var emailContent = emailTemplate
                .Replace("{Login}", Login)
                .Replace("{Link}", _configuration["Url"] + "/RecoverAccount/" + Token);

            var emailMessage = new EmailBuilder()
                .CreateHtmlEmail(Email, "Recuperar Conta", emailContent);

            await _aadGraphApiDelegatedClient.SendEmailAsync(emailMessage);
        }
    }
}

Answer 1

错误是不言而喻的。您有公共AuthController（sendmail-sendmail），依赖注入不知道如何实例化sendmail。在控制器的DI中传递具体（类）变量不是一个好的做法。您要执行以下操作：

public interface ISendEmail { ... }
public class SendEmail : ISendEmail { ... }

并在启动中。cs

services.AddScoped<ISendEmail, SendEmail>();

然后在控制器中

private ISendEmail _sendEmail;
public AuthController(ISendEmail sendEmail) {
   _sendEmail = sendEmail;
}