ASP.NET Core System.TypeLoadException DependencyInjection.Extensions.ServiceCollectionExtensions 错误答案

【问题标题】：ASP.NET Core System.TypeLoadException DependencyInjection.Extensions.ServiceCollectionExtensions errorASP.NET Core System.TypeLoadException DependencyInjection.Extensions.ServiceCollectionExtensions 错误
【发布时间】：2017-01-15 01:15:42
【问题描述】：

我是 Asp.Net Core 的新手。在创建一个简单的 MVC 项目时出现以下错误。

System.TypeLoadException 无法加载类型 'Microsoft.Extensions.DependencyInjection.Extensions.ServiceCollectionExtensions' 从程序集'Microsoft.Extensions.DependencyInjection.Abstractions，版本=1.0.0.0，文化=中性，PublicKeyToken=adb9793829ddae60'。在 Microsoft.Extensions.DependencyInjection.OptionsServiceCollectionExtensions.AddOptions(IServiceCollection 服务）在 Microsoft.Extensions.DependencyInjection.MvcCoreServiceCollectionExtensions.AddMvcCore(IServiceCollection 服务，操作 setupAction）在 Microsoft.Extensions.DependencyInjection.MvcServiceCollectionExtensions.AddMvc(IServiceCollection 服务，操作 setupAction）在 POC.Startup.ConfigureServices(IServiceCollection 服务)

System.Reflection.TargetInvocationException 已抛出异常通过调用的目标。在 System.RuntimeMethodHandle.InvokeMethod（对象目标，对象 [] 参数，签名 sig，布尔构造函数）在 System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal（对象 obj， Object[] 参数，Object[] 参数）在 System.Reflection.RuntimeMethodInfo.Invoke（对象 obj，BindingFlags invokeAttr、Binder binder、Object[] 参数、CultureInfo 文化）在 Microsoft.AspNetCore.Hosting.Internal.ConfigureServicesBuilder.Invoke（对象例如，IServiceCollection exportServices) 在 Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices() 在 Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()

以下是我的 Project.json 文件

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.0",
      "type": "platform"
    },
    "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.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel":"1.0.0-rc1-final",
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNet.Mvc.Core": "6.0.0-rc1-final"
  },

  "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%" ]
  }
}

下面是我的 Startup.cs 文件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNet.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.DependencyInjection;

namespace POC
{
    public class Startup
    {
        // 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.AddMvc();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app)
        {
            app.UseMvc( m=> 
            m.MapRoute(
                name:"Default",
                template:"{controller}/{action}/{id?}",
                defaults:new { controller="Home", action="index"}
                ));
        }
    }
}

我确实在 startup.cs 文件中的 service.AddMvc() 行收到错误。请为此提出解决方案。

【问题讨论】：

标签： asp.net-core

【解决方案1】：

您是否尝试过在 project.json 中将此依赖项用于 MVC：

"Microsoft.AspNetCore.Mvc": "1.0.0"

而不是这些？

"Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
"Microsoft.AspNet.Mvc.Core": "6.0.0-rc1-final"

将AspNetCore 与AspNet 一起用于您的MVC 依赖项可能会导致冲突。

【讨论】：