asp.net-core - Asp.Net Core 没有注册类型的服务

Question

我有以下两个类(class)

public class RepositoryConnection : IRepositoryConnection{

    public RepositoryConnection(IConfiguration configuration, ILogger<RepositoryConnection> logger){
    //STUFF
    }

}

public class AuthenticationTokenFactory : IAuthenticationTokenFactory {

   public AuthenticationTokenFactory(ILogger<AuthenticationTokenFactory> logger) {
    //STUFF 
    }
}

这是我的 Startup.cs

public class Startup {

    public Startup(IConfiguration configuration) {
        Configuration = configuration;
    }
    public void ConfigureServices(IServiceCollection services) {
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        services.AddSingleton<IAuthenticationTokenFactory, AuthenticationTokenFactory>();
        services.AddSingleton<IRepositoryConnection,RepositoryConnection>();
   }
}

我可以成功注入(inject)IAuthenticationTokenFactory到 Controller ，但是当我尝试注入(inject) IRepositoryConnection我收到以下错误→

InvalidOperationException: No service for type　'TrainingCommerce.Accessors.RepositoryConnection' has been　registered.

感谢评论，我立即注意到我的错误方式。
我试图在另一条线路上访问

var debug = ControllerContext.HttpContext.RequestServices.GetRequiredService<RepositoryConnection>();

Answer 1

尝试注入(inject)接口(interface)而不是实现:

在您的 sample 中注入(inject) ILogger<RepositoryConnection> logger这是一个错字，应该是:ILogger<IRepositoryConnection> logger .

所以:

public class RepositoryConnection : IRepositoryConnection{
    public RepositoryConnection(IConfiguration configuration, ILogger<IRepositoryConnection> logger){
    //STUFF
    }
}