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应用程序抛出了未处理的异常 . System.InvalidOperationException：无法>解析类型的服务

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我有一个简单的asp.net核心web api，我试图只使用visual studio模板默认带来的api /值 . 但是我收到这个错误：

托管环境： 生产环境 内容根路径：C：\ api.E-commerce现在正在侦听：http：// localhost：18401应用程序已启动 . 按Ctrl C关闭 . 失败：Microsoft.AspNetCore.Server.Kestrel [13]连接ID“0HL3RHG5NLHAL”：应用程序抛出了未处理的异常 . System.InvalidOperationException：尝试激活“ContactsApi.Controllers.ValuesController”时无法解析类型“ECommerce.Api.Repository.Ecommerce.IEcommerceRepository”的服务 . 在Microsoft.AspNetCore.Mvc.Internal.TypeActivatorCache.CreateInstance [TInstance]的lambda_method（Closure，IServiceProvider，Object []）上的Microsoft.Extensions.Internal.ActivatorUtilities.GetService（IServiceProvider sp，Type type，Type requiredBy，Boolean isDefaultParameterRequired） IServiceProvider serviceProvider，Type implementationType）在Microsoft的Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next（State＆next，Scope＆scope，Object＆state，Boolean＆isCompleted）的Microsoft.AspNetCore.Mvc.Controllers.DefaultControllerFactory.CreateController（ControllerContext context）中 . AspNetCore.Mvc.Internal.ControllerActionInvoker.d__22.MoveNext（）---抛出异常的前一个位置的堆栈跟踪结束---在Microsoft.AspNetCore.Mvc.Internal的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）处Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next中的.ControllerActionInvoker.Rethrow（ResourceExecutedContext context）（状态和下一个，范围和范围， Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__20.MoveNext（）中的Object＆state，Boolean＆isCompleted）---从抛出异常的上一个位置开始的堆栈跟踪结束---在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（ ）在Microsoft.AspNetCore.Builder.RouterMiddleware.d__4.MoveNext（）的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）---从抛出异常的上一个位置的堆栈跟踪结束---在System.Runtime Microsoft.AspNetCore.Authentication.AuthenticationMiddleware1中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中的.ExceptionServices.ExceptionDispatchInfo.Throw（） . <Invoke> d__18.MoveNext（）---来自上一个位置的堆栈跟踪结束抛出异常---在Microsoft.AspNetCore.Authentication.AuthenticationMiddleware1.d__18.MoveNext（）的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中 - 堆栈跟踪结束从抛出异常的先前位置---在Microsoft.AspNetCore.Authentication.AuthenticationMiddleware1的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）处 . <Invoke> d__18 . MoveNext（）---从抛出异常的先前位置开始的堆栈跟踪结束---在Microsoft.AspNetCore.Authentication.AuthenticationMiddleware1.d__18.MoveNext（）的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中---结束来自抛出异常的先前位置的堆栈跟踪---在Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）处 . d__7.MoveNext（）---抛出异常的前一个位置的堆栈跟踪结束---在Syst的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）处Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.d__7.MoveNext（）中的em.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）---从抛出异常的上一个位置开始的堆栈跟踪结束---在System.Runtime Microsoft.AspNetCore.Server.IISIntegration.IISMiddleware.d__8.MoveNext（）中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中的.ExceptionServices.ExceptionDispatchInfo.Throw（）---来自先前位置的堆栈跟踪结束被抛出---在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）atMicrosoft.AspNetCore.Hosting.Internal.RequestServicesContainerMiddleware.d__3.MoveNext（）中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）---从抛出异常的上一个位置的堆栈跟踪结束---在System.Runtime Microsoft.AspNetCore.Server.Kestrel.Internal.Http.Frame`1.d__2.MoveNext（）中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中的.ExceptionServices.ExceptionDispatchInfo.Throw（）

启动代码是：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Serialization;
using Microsoft.EntityFrameworkCore;
using ContactsApi.Contexts;
using ECommerce.Api.Models.ERP;
using ECommerce.Api.Repository.ERP;
using System.IO;
//using Microsoft.AspNetCore.Mvc;
//using Microsoft.AspNetCore.Mvc.Cors.Internal;

namespace ContactsApi
{
    public partial class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
            Configuration = builder.Build();

           // var host = new WebHostBuilder()
           //.UseKestrel()
           //.UseContentRoot(Directory.GetCurrentDirectory())
           //.UseIISIntegration() // IMPORTANT!!!
           //.UseStartup<Startup>()
           //.Build();
           // host.Run();
        }

        public IConfigurationRoot Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddMvc()
                    .AddJsonOptions(a => a.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver()); ;

            //using Dependency Injection
            //services.AddSingleton<IContactsRepository, ContactsRepository>();
            //services.AddSingleton<ITodoTerrenoRepository, TodoTerrenoRepository>();

            services.AddDbContext<ContactsContext>(options =>
             options.UseSqlServer(Configuration.GetConnectionString("AuthentConnection")));
            services.AddDbContext<TODOTERRENOContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
            services.AddCors(options =>
            {
                options.AddPolicy("AllowAllOrigins", builder => builder.AllowAnyOrigin());
                options.AddPolicy("AllowAllHeaders", builder => builder.AllowAnyHeader());
                options.AddPolicy("AllowCredentials", builder => builder.AllowCredentials());
            });

            services.Configure<IISOptions>(options =>
            {

                options.AutomaticAuthentication = true;
                options.ForwardClientCertificate = true;
                options.ForwardWindowsAuthentication = true;


            });


        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();
            app.UseCors("AllowAllOrigins");
            app.UseCors("AllowAllHeader");
            ConfigureAuth(app);
            //app.UseMvc(routes =>
            //{
            //    routes.MapRoute("default", "{controller=Home}/{action=Index}/{id?}");
            //});           
            //// Shows UseCors with CorsPolicyBuilder.
            //app.UseCors("AllowSpecificOrigin");
            app.UseMvc();
        }
    }
}

UPDATE 1

值控制器

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using ECommerce.Api.Repository.Ecommerce;

namespace ContactsApi.Controllers
{
    //[Authorize]
    [Route("api/[controller]")]
    public class ValuesController : Controller
    {

        public IEcommerceRepository ContactsRepo { get; set; }


        public ValuesController(IEcommerceRepository _repo)
        {
            ContactsRepo = _repo;
        }
        // GET api/values
       // [HttpGet]
        //public IEnumerable<string> Get()
        //{


        //    ContactsRepo.CrearUsuario();

        //    return new string[] { "value1", "value2" };
        //}

       // [HttpGet]
        [HttpGet("{DatosUsuario}")]
        public string GestionarUsuario(string DatosUsuario)
        {



            return ContactsRepo.GestionarUsuario(DatosUsuario).Result;
        }

        // GET api/values/5
        [HttpGet]
       // public string Get(in)
        public string Get()
        {
            return "value";
        }

        // POST api/values
        [HttpPost]
        public void Post([FromBody]string value)
        {
        }

        // PUT api/values/5
        [HttpPut("{id}")]
        public void Put(int id, [FromBody]string value)
        {
        }

        // DELETE api/values/5
        [HttpDelete("{id}")]
        public void Delete(int id)
        {
        }
    }
}

UDPATE 2

现在我们得到Stackoverflow异常！，日志文件中根本没有任何细节

c# .net asp.net-web-api asp.net-core asp.net-core-mvc

2 回答

  • 1

    看来你没有注册 EcommerceRepository 到 IEcommerceRepository .

    例如，

    public void ConfigureServices(IServiceCollection services)
{
   ...
   services.AddTransient<IEcommerceRepository, EcommerceRepository>();
   ...
}
    回复于
  • 3

    错误消息表明正在命中 ValuesController . 在尝试实例化此控制器时， IEcommerceRepository 在构造函数中使用 . 依赖注入框架试图找到 IEcommerceRepository 类型的实现 .

    这应该在 Startup.cs 中注册 . 您可以在ConfigureServices方法中注册类似于： services.AddSingleton<IEcommerceRepository, MyEcommerceRepository>(); 的内容 .

    回复于

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