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。但是我收到了这个错误：
托管环境：生产内容根路径：C：\ api.E-commerce 现在收听：http://localhost:18401应用程序已启动。按 按Ctrl + C关闭。失败：Microsoft.AspNetCore.Server.Kestrel [13] 连接ID＆＃34; 0HL3RHG5NLHAL＆＃34;：应用程序抛出了未处理的异常。 System.InvalidOperationException：无法执行 解决类型的服务 ＆＃39; ECommerce.Api.Repository.Ecommerce.IEcommerceRepository＆＃39;而 试图激活＆＃39; ContactsApi.Controllers.ValuesController＆＃39;。
在 Microsoft.Extensions.Internal.ActivatorUtilities.GetService（的IServiceProvider sp，Type type，Type requiredBy，Boolean isDefaultParameterRequired）
在lambda_method（Closure，IServiceProvider，Object []）at Microsoft.AspNetCore.Mvc.Internal.TypeActivatorCache.CreateInstance [TInstance]（的IServiceProvider serviceProvider，类型implementationType）at Microsoft.AspNetCore.Mvc.Controllers.DefaultControllerFactory.CreateController（ControllerContext 上下文） Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next（州及放大器; 接下来，范围＆amp;范围，对象＆amp; state，Boolean＆amp; isCompleted）at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__22.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow（ResourceExecutedContext 上下文） Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next（州及放大器; 接下来，范围＆amp;范围，对象＆amp; state，Boolean＆amp; isCompleted）at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__20.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务 任务） Microsoft.AspNetCore.Builder.RouterMiddleware.d__4.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务 任务） Microsoft.AspNetCore.Authentication.AuthenticationMiddleware1.<Invoke>d__18.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware1.d__18.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务 任务） Microsoft.AspNetCore.Authentication.AuthenticationMiddleware1.<Invoke>d__18.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware1.d__18.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务 任务） Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.d__7.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务 任务） Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.d__7.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务 任务） Microsoft.AspNetCore.Server.IISIntegration.IISMiddleware.d__8.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务 任务） Microsoft.AspNetCore.Hosting.Internal.RequestServicesContainerMiddleware.d__3.MoveNext（） ---从抛出异常的先前位置开始的堆栈跟踪结束--- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务 任务） Microsoft.AspNetCore.Server.Kestrel.Internal.Http.Frame`1.d__2.MoveNext（）
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();
}
}
}
更新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
答案 0 :(得分：3)
错误消息表明正在点击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类型IEcommerceRepository的实现。
这应该在Startup.cs中注册。您可以注册如下：
ConfigureServices方法中的services.AddSingleton<IEcommerceRepository, MyEcommerceRepository>();。
答案 1 :(得分：1)
您似乎未将 EcommerceRepository 注册到 IEcommerceRepository 。
例如，
public void ConfigureServices(IServiceCollection services)
{
...
services.AddTransient<IEcommerceRepository, EcommerceRepository>();
...
}