使用新的单文件模板将 Autofac Json 配置添加到 .NET core 6.0

Question

我正在尝试将 Autofac 添加到 .NET 6.0 Web API 并从 JSON 文件读取 Autofac 组件配置。 我正在使用最新的 ASP.NET Core Web API 模板，该模板生成单个启动 Program.cs 文件。

已安装的 Autofac 版本：

Autofac.Configuration (6.0.0)
Autofac.Extensions.DependancyInjection (8.0.0)

已安装的.Net 6.0版本：

Microsoft.AspNetCore.App 6.0.20
Microsoft.NETCore.App 6.0.20

以防万一，这是 Program.cs 文件的全部内容（是的，没有命名空间或类定义。只有 Program.cs 文件，没有 StartUp 类或 Startup.cs 文件） )

var configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("autofac.json");
var autoFacConfigurationModule = new ConfigurationModule(configurationBuilder.Build());
var temp = new IpTablesDotNetSystem();

var builder = WebApplication.CreateBuilder(args);

builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory((containerBuilder) =>
{
    containerBuilder.RegisterModule(autoFacConfigurationModule);
    //containerBuilder.RegisterType<IpTablesDotNetSystem>().As<IIpTablesSystem>().SingleInstance();
}
));

// Add services to the container.
builder.Services.AddControllers();

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseAuthorization();

app.MapControllers();

app.Run();

但是我遇到了如下异常：

System.InvalidOperationException: Unable to resolve service for type 'BSN.IpTables.Domain.IIpTablesSystem' while attempting to activate 'BSN.IpTables.Api.Controllers.HomeController'.
   at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired)
   at lambda_method364(Closure , IServiceProvider , Object[] )
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider.<>c__DisplayClass7_0.<CreateActivator>b__0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass6_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

正如你在上面的代码中看到的，如果我取消注释

containerBuilder.RegisterType<IpTablesDotNetSystem>().As<IIpTablesSystem>().SingleInstance();

而不是

RegisterModule

所有项目都正常工作。但我需要从文件中读取配置，并且不知道该怎么做？

我尝试查看最新的 Autofac 文档，但没有找到任何适合 .NET 6.0 代码的内容。我不知道如何使用 Autofac 配置。

来自 Autofac 网站的代码片段：

// Add the configuration to the ConfigurationBuilder.
var config = new ConfigurationBuilder();

// config.AddJsonFile comes from Microsoft.Extensions.Configuration.Json
// config.AddXmlFile comes from Microsoft.Extensions.Configuration.Xml
config.AddJsonFile("autofac.json");

// Register the ConfigurationModule with Autofac.
var module = new ConfigurationModule(config.Build());
var builder = new ContainerBuilder();
builder.RegisterModule(module);

Autofac 文档：

https://autofac.readthedocs.io/en/latest/configuration/xml.html#quick-start

我的完整项目：

https://github.com/BSVN/IpTables.Api/pull/9

---

更新

我最新的autofac.json文件如下：

{
  "components": [
    {
      "type": "BSN.IpTables.Data.IpTablesDotNetSystem, BSN.IpTables.Data",
      "services": [
        {
          "type": "BSN.IpTables.Domain.IIpTablesSystem, BSN.IpTables.Domain"
        }
      ],
      "instanceScope": "single-instance"
    }
  ]
}

Answer 1

您必须更正您的 JSON

servics

->

services

:

{
  "components": [
    {
      "type": "BSN.IpTables.Data.IpTablesDotNetSystem, BSN.IpTables.Data",
      "services": [
        {
          "type": "BSN.IpTables.Domain.IIpTablesSystem, BSN.IpTables.Domain"
        }
      ]
    }
  ]
}