c# - 尝试激活 'Microsoft.Extensions.Configuration.IConfigurationRoot' 时无法解析类型 'TheWorld.Startup' 的服务

Question

似乎我遇到了某种不匹配的引用问题(抱歉，我对 ASP 版本很陌生)。

我使用 VS 2016 从头开始​​创建 ASP.core 应用程序。我的启动类是这样的:

public class Startup
    {
        private IHostingEnvironment _env;
        private IConfigurationRoot _config;

        public Startup(IHostingEnvironment env, IConfigurationRoot config)
        {
            _env = env;

            var builder = new ConfigurationBuilder()
                .SetBasePath(_env.ContentRootPath)
                .AddJsonFile("config.json");

            _config = builder.Build();
        }

        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton(_config);

            if(_env.IsEnvironment("Development"))
               services.AddScoped<Services.IMailServices, Services.DebugMailService>();

            services.AddMvc();
        }

        // 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)
        {

            if(env.IsDevelopment())
               app.UseDeveloperExceptionPage();

            app.UseStaticFiles();
            app.UseMvc(config =>
            {
                config.MapRoute(name: "Default",
                template: "{controller}/{action}/{id?}",
                defaults: new { controller = "App", action = "Index" }
                );
             });
        }
    }

虽然我在使用“IConfigurationRoot”时遇到了困难。我已经通过 IDE 添加了它的引用，并且 project.json 看起来像这样:

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.1",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0-rc2-final",
    "Microsoft.AspNetCore.Mvc": "1.1.3",
    "Microsoft.AspNetCore.Mvc.TagHelpers": "1.1.3",
    "Microsoft.Extensions.Configuration.FileExtensions":  "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0"
  },

  "tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }

你们能看出这里有什么愚蠢的错误吗？

干杯

Answer 1

使用 IConfiguration 而不是 IConfigurationIRoot