在启动时读取 AppSettings.json 时处理 TypeLoadException

Question

我正在开发 ASP.NET 核心应用程序，我在其中实现将从 appsetting.json 读取值的功能

为此，我正在关注本教程 - http://benjii.me/2016/04/new-configuration-appsettings-mvc6-web-config-gone/

在本教程中，我按照以下方式自动绑定所有应用设置-

public IServiceProvider ConfigureServices(IServiceCollection services)
{            
    services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));
}

在这个特定的行 - services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));，我正在低于异常 -

“System.TypeLoadException”类型的异常发生在 Microsoft.Extensions.OptionsModel.dll 但未在用户代码中处理

附加信息：无法加载类型 'Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions' 从程序集'Microsoft.Extensions.DependencyInjection.Abstractions， 版本=1.0.0.0，文化=中性，PublicKeyToken=adb9793829ddae60'。

Project.json

{
  "dependencies": {
    "Microsoft.AspNetCore.Diagnostics":"1.0.0",
    "Microsoft.AspNetCore.Identity": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.0",
    "Microsoft.AspNetCore.Mvc.TagHelpers": "1.0.0",
    "Microsoft.AspNetCore.Mvc.WebApiCompatShim": "1.0.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.Extensions.Configuration.CommandLine": "1.0.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Configuration.UserSecrets": "1.0.0",
    "Microsoft.Extensions.Logging": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Logging.Debug": "1.0.0",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0",
    "Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.VisualStudio.Web.CodeGenerators.Mvc": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0",
    "Microsoft.EntityFrameworkCore.SqlServer.Design": {
      "version": "1.0.0",
      "type": "build"
    },
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    }
  },

  "tools": {
    "BundlerMinifier.Core": "2.0.238",
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
    "Microsoft.Extensions.SecretManager.Tools": "1.0.0-preview2-final",
    "Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
      "version": "1.0.0-preview2-final",
      "imports": [
        "portable-net45+win8"
      ]
    }
  },

  "frameworks": {
    "net461": { }
  },

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

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config",
      "Views",
      "Areas/**/Views",
      "appsettings.json"
    ]
  },

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

我无法弄清楚我在这里缺少什么。有人可以指出我在这里失踪了吗？

我的环境是VS2015 Professional update3和一台Windows 7的机器。

感谢和问候

维沙尔

Answer 1

在你的 project.json 中添加以下包

"Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0"

这个包包含 OptionsConfigurationServiceCollectionExtensions 类，它有扩展方法IServiceCollection Configure<TOptions>