“System.TypeLoadException”发生在 > Microsoft.AspNet.Mvc.Core.dll

Question

我正在尝试创建示例 asp.net 核心应用程序。 但是在调试时它会抛出一个错误：

Microsoft.AspNet.Mvc.Core.dll 中出现类型为“System.TypeLoadException”的异常，但未在用户代码中处理

附加信息：无法从程序集“Microsoft.Extensions.DependencyInjection.Abstractions，Version=1.0.0.0，Culture=neutral，PublicKeyToken=adb9793829ddae60”加载类型“Microsoft.Extensions.DependencyInjection.Extensions.ServiceCollectionExtensions”。

怎么了？

项目.json

{
  "dependencies": {
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Mvc.Core": "1.0.1",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.NETCore.App": {
      "version": "1.0.1",
      "type": "platform"
    }
  },

  "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%" ]
  }
}

启动文件

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, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole();

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

            app.UseStaticFiles();

            app.UseMvc();
        }
    }

Answer 1

删除"Microsoft.AspNetCore.Mvc.Core": "1.0.1"和"Microsoft.AspNet.Mvc": "6.0.0-rc1-final" ，然后将其替换为"Microsoft.AspNetCore.Mvc": "1.0.1"

最终版本

{
  "dependencies": {
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.1",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.NETCore.App": {
      "version": "1.0.1",
      "type": "platform"
    }
  }

Microsoft.AspNet.Mvc已经引用了Microsoft.AspNet.Mvc.Core ，所以不需要直接引用它。

Answer 2

您在依赖项中缺少 "Microsoft.Extensions.DependencyInjection.Abstractions": "1.0.0"。

Answer 3

您的project.json看起来像您使用的是 ASP.NET Core RC2，但从那时起您升级到了发布版本。

文档说，为了使 RC2 中的一切正常，你应该

如果您的目标是 .NET Core 和 RC2，您需要将导入添加到 project.json 作为一些不支持 .NET Standard 的 EF Core 依赖项的临时解决方法。 现在可以删除这些。

来源： ASP.NET Core 文档

所以删除

"imports": [
    "dotnet5.6",
    "portable-net45+win8"
]

从你的project.json