无法从程序集中加载类型 - ASP.NET Core

Question

将 MVC 中间件添加到 ASP.NET Core 解决方案时出现以下错误

System.TypeLoadException 无法从程序集中加载类型“Microsoft.Extensions.DependencyInjection.Extensions.ServiceCollectionExtensions” 'Microsoft.Extensions.DependencyInjection.Abstractions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'。

Line 26:          public void ConfigureServices(IServiceCollection services)
Line 27:          {
Line 28:              services.AddMvc();
Line 29:              services.AddSingleton(provider => Configuration);
Line 30:              services.AddSingleton<IGreeter, Greeter>();

 at Microsoft.Extensions.DependencyInjection.OptionsServiceCollectionExtensions.AddOptions(IServiceCollection services) 
at Microsoft.Extensions.DependencyInjection.MvcCoreServiceCollectionExtensions.AddMvcCore(IServiceCollection services, Action<MvcOptions> setupAction) 
at Microsoft.Extensions.DependencyInjection.MvcServiceCollectionExtensions.AddMvc(IServiceCollection services, Action<MvcOptions> setupAction) 
at OdeToFood2.Startup.ConfigureServices(IServiceCollection services) in C:\Users\aindriu\documents\visual studio 2015\Projects\OdeToFood2\src\OdeToFood2\Startup.cs:line 28
System.Reflection.TargetInvocationException
Exception has been thrown by the target of an invocation.
at System.RuntimeMethodHandle.InvokeMethod(object target, Object[] arguments, Signature sig, bool constructor) 
at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(object obj, Object[] parameters, Object[] arguments) 
at System.Reflection.RuntimeMethodInfo.Invoke(object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) 
at Microsoft.AspNetCore.Hosting.Internal.ConfigureServicesBuilder.Invoke(object instance, IServiceCollection exportServices) 
at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices() 
at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()

我在 project.json 文件中的依赖项是

    {
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.0",
      "type": "platform"
    },
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.0.0",
    "Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final",
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.AspNetCore.Mvc.Core": "1.0.0",
    "Autofac.Extensions.DependencyInjection": "4.0.0-rc3-309"
  },

json文件中不同版本之间是否存在冲突？

这是我的解决方案 -

https://dl.dropboxusercontent.com/u/10629841/OdeToFood2.zip

Answer 1

我使用“yo aspnet”创建了一个全新的 web api 应用程序，并拥有以下 project.json：

"Microsoft.AspNetCore.Mvc": "1.0.0",
"Microsoft.AspNetCore.Mvc.Core": "1.0.0",
"Microsoft.AspNetCore.StaticFiles": "1.0.0",
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
"Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
"Microsoft.Extensions.Configuration.Json": "1.0.0",
"Microsoft.Extensions.Configuration.CommandLine": "1.0.0",
"Microsoft.Extensions.Logging": "1.0.0",
"Microsoft.Extensions.Logging.Console": "1.0.0",
"Microsoft.Extensions.Logging.Debug": "1.0.0",
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0"

为了得到你在我必须添加 Microsoft.AspNetCore.Mvc.Core 和 Microsoft.AspNetCore.StaticFiles 之后的样子。

如果解决了问题，请告诉我。

Answer 2

您的 project.json 中是否缺少这两者之一？

"Microsoft.Extensions.DependencyInjection":"1.0.0",
"Microsoft.Extensions.DependencyInjection.Abstractions":"1.0.0",