Question

我有一个控制器DailyExpenseController，我正在将IQueryExecutor类注入控制器。

DailyExpenseController

using HomeBudgetTrackingSystem.CrossCutting;
using HomeBudgetTrackingSystem.DTO;
using HomeBudgetTrackingSystem.Models;
using HomeBudgetTrackingSystem.Query;
using Microsoft.AspNetCore.Mvc;
using System.Threading.Tasks;

namespace HomeBudgetTrackingSystem.Controllers
{
    [Produces("application/json")]
    [Route("api/DailyExpense/{Id}")]
    public class DailyExpenseController : Controller
    {
        private readonly IQueryExecutor queryExecutor;

        public DailyExpenseController(IQueryExecutor queryExecutor)
        {
            this.queryExecutor = queryExecutor;
        }

        [HttpPost]
        [Route("Create")]
        public async Task<IActionResult> CreateExpense(long Id, [FromBody] Expenditure expenditure)
        {
            var findEntity = new FindEntityQuery<Expense>(Id);
            var find = queryExecutor.Execute(findEntity);

            /*if (find == null)
                return NotFound();*/


            var createExpenses = new CreateExpenditure(expenditure);
            var expenses = queryExecutor.Execute(createExpenses);
            return Ok(expenses);
        }

        /*If I write this method, it will result in 500 Error, because this method has id which is confusing 
         with the variable Id declared with Controller*/
        /*[HttpGet("{id}")]
        public string Get(int id)
        {
            return "value";
        }*/

        [HttpGet("{id2}")]
        public string Get(long id)
        {
            return "value";
        }

        [HttpPost]
        public void Post([FromBody]string value)
        {
        }

    }
}

以下是我的Autofac配置详情

Startup.cs

using Autofac;
using Autofac.Extensions.DependencyInjection;
using HomeBudgetTrackingSystem.Repository;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System;

namespace HomeBudgetTrackingSystem
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        //public void ConfigureServices(IServiceCollection services)
        public IServiceProvider ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            /*services.AddDbContext<BudgetContext>(options =>
             options.UseSqlServer(Configuration.GetConnectionString("BudgetConnection")
        )); */

            var builder = new ContainerBuilder();
            builder.Populate(services);
            builder.RegisterModule(new RepositoryHandlerModule());
            //builder.RegisterType<QueryExecutor>().As<IQueryExecutor>();
            ApplicationContainer = builder.Build();
            return new AutofacServiceProvider(ApplicationContainer);
        }

        public IContainer ApplicationContainer { get; private set; }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLifetime)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseMvc();
            appLifetime.ApplicationStopped.Register(() => ApplicationContainer.Dispose());
        }
    }
}

下面是我的模型构建器类，我在其中注册了依赖项

RepositoryHandlerModule.cs

using Autofac;
using HomeBudgetTrackingSystem.CrossCutting;

namespace HomeBudgetTrackingSystem.Repository
{
    public class RepositoryHandlerModule : Module
    {
        protected override void Load(ContainerBuilder builder)
        {
            builder.RegisterType<QueryExecutor>().As<IQueryExecutor>().InstancePerRequest();
        }
    }
}

我没有对Program.cs进行任何更改

Program.cs的

using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;

namespace HomeBudgetTrackingSystem
{
    public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
        }

        public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .Build();
    }
}

以下是我收到的例外情况

Autofac.Core.DependencyResolutionException：无法解析类型＆＃39; HomeBudgetTrackingSystem.CrossCutting.QueryExecutor＆＃39;因为它所属的生命范围无法找到。此注册公开了以下服务：    - HomeBudgetTrackingSystem.CrossCutting.IQueryExecutor

详情---＆gt;没有标记匹配的范围＆＃39; AutofacWebRequest＆＃39;从请求实例的范围可见。

如果在执行Web应用程序期间看到此情况，则通常表示SingleInstance（）组件（或类似方案）正在请求按HTTP请求注册的组件。在Web集成下，始终从依赖项解析程序或请求生存期范围请求依赖项，而不是从容器本身请求。（详见内部异常。）---＆gt; Autofac.Core.DependencyResolutionException：没有标记匹配的范围＆＃39; AutofacWebRequest＆＃39;从请求实例的范围可见。

如果在执行Web应用程序期间看到此情况，则通常表示SingleInstance（）组件（或类似方案）正在请求按HTTP请求注册的组件。在Web集成下，始终从依赖项解析程序或请求生存期范围请求依赖项，而不是从容器本身请求。      在Autofac.Core.Lifetime.MatchingScopeLifetime.FindScope（ISharingLifetimeScope mostNestedVisibleScope）      在Autofac.Core.Resolving.InstanceLookup..ctor（IComponentRegistration注册，IResolveOperation上下文，ISharingLifetimeScope mostNestedVisibleScope，IEnumerable 1 parameters) --- End of inner exception stack trace --- at Autofac.Core.Resolving.InstanceLookup..ctor(IComponentRegistration registration, IResolveOperation context, ISharingLifetimeScope mostNestedVisibleScope, IEnumerable 1个参数）      at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance（ISharingLifetimeScope currentOperationScope，IComponentRegistration registration，IEnumerable 1 parameters) at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable 1个参数）      at Autofac.ResolutionExtensions.TryResolveService（IComponentContext context，Service service，IEnumerable 1 parameters, Object& instance) at Autofac.ResolutionExtensions.ResolveOptionalService(IComponentContext context, Service service, IEnumerable 1个参数）      在Microsoft.Extensions.Internal.ActivatorUtilities.GetService（IServiceProvider sp，Type type，Type requiredBy，Boolean isDefaultParameterRequired）      在lambda_method（Closure，IServiceProvider，Object []）      在Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider。＆lt;＆gt; c__DisplayClass4_0.b__0（ControllerContext controllerContext）      在Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider。＆lt;＆gt; c__DisplayClass5_0.g__CreateController | 0（ControllerContext controllerContext）      在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next（State＆amp; next，Scope＆amp; scope，Object＆amp; state，Boolean＆amp; isCompleted）      在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__14.MoveNext（）   ---从抛出异常的先前位置开始的堆栈跟踪结束---      在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）      在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）      在Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.d__22.MoveNext（）   ---从抛出异常的先前位置开始的堆栈跟踪结束---      在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）      在Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow（ResourceExecutedContext context）      在Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next（State＆amp; next，Scope＆amp; scope，Object＆amp; state，Boolean＆amp; isCompleted）      在Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.d__17.MoveNext（）   ---从抛出异常的先前位置开始的堆栈跟踪结束---      在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）      在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）      在Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.d__15.MoveNext（）   ---从抛出异常的先前位置开始的堆栈跟踪结束---      在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）      在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）      在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---      在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）      在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）      在Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.d__7.MoveNext（）

我已经在这些上提到了多个链接。突出的是

http://autofac.readthedocs.io/en/latest/faq/per-request-scope.html http://autofac.readthedocs.io/en/latest/integration/aspnetcore.html （我更喜欢没有容器的配置） http://www.codedigest.com/posts/49/using-autofac-instead-of-inbuilt-di-container-with-in-aspnet-core-mvc（这是我提到的那个）

有人可以帮我解决这些问题吗？

Answer 1

我能够找到问题的解决方案。

http://autofaccn.readthedocs.io/en/latest/integration/aspnetcore.html

此处标题＆＃39;与ASP.NET Classic的区别＆＃39;列出了一个关键点使用InstancePerLifetimeScope而不是InstancePerRequest。

我还在RepositoryHandlerModule.cs中进行了更改，例如添加BudgetContext.cs 如下所示

public class RepositoryHandlerModule : Module
    {
        protected override void Load(ContainerBuilder builder)
        {
            base.Load(builder);
            builder.RegisterType<QueryExecutor>().As<IQueryExecutor>().InstancePerLifetimeScope();
            builder.RegisterType<BudgetContext>().InstancePerLifetimeScope();
        }
    }

与Autofac集成时，C＃ASP.Net核心面临问题

1 个答案: