Failed to load file or assembly "System.Runtime.Loader" to add application parts to MVC

Question

I am trying to load parts of an application into an ASP.NET Core 2.0 MVC appication using a package System.Runtime.Loader, but it will not allow me.

The error message says:

FileNotFoundException: Failed to load the file or assembly "System.Runtime.Loader, Version = 4.0.0.0, Culture = neutral, PublicKeyToken = b03f5f7f11d50a3a" or one of its dependencies. The system cannot find the specified file.

In Startup.csI use it like this (it should just be a proof of concept that this works, so I can move it to a dedicated class or extension):

services
    .AddMvc()
    .ConfigureApplicationPartManager(apm =>
    {
        var parts = Directory.GetFiles(_rootPath, "*.Part.*");
        foreach (var part in parts)
        {
            apm.ApplicationParts.Add(new AssemblyPart(AssemblyLoadContext.Default.LoadFromAssemblyPath(part)));
        }
    });

The installed package has a version 4.3.0, and I use it in ASP.NET Core 2.0 with .NET 4.6.2.

, - , runtime app.config

  <runtime>
    <gcServer enabled="true"/>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <publisherPolicy apply="no"/>
        <assemblyIdentity name="System.Runtime.Loader" publicKeyToken="b03f5f7f11d50a3a" culture="en-US"/>
        <bindingRedirect oldVersion="4.3.0.0" newVersion="4.0.0.0"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

. , 1.0.0.0-5.0.0.0, .

, IE, - :

WebApiProject.Startup.<ConfigureServices>b__8_1(ApplicationPartManager apm)
Microsoft.Extensions.DependencyInjection.MvcCoreMvcBuilderExtensions.ConfigureApplicationPartManager(IMvcBuilder builder, Action<ApplicationPartManager> setupAction)

WebApiProject.Startup.ConfigureServices(IServiceCollection services) in Startup.cs
- 
38.        public IHostingEnvironment Environment { get; }
39.
40.        // This method gets called by the runtime. Use this method to add services to the container.
41.        public void ConfigureServices(IServiceCollection services)
42.        {
43.            // Add framework services.
44.            services
45.                .AddMvc()
...
50.                .ConfigureApplicationPartManager(apm =>


System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceColection services)

Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()

Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()

System.Runtime.*, System.Runtime.Loader. , , ? , .dll , VS ?

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Update

, . . NuGet , , packages , :

c:\Users\%USER%\.nuget\packages\system.runtime.loader\4.3.0\lib\

, net462. : _

, .dll:

MonoAndroid10\
MonoTouch10\
net462\
netstandard1.5\ <-- System.Runtime.Loader.dll
xamarinios10\
xamarinmac20\
xamarintvos10\
xamarinwatchos10\

? , , *.dll , ? , , ​​.net ?

---

- , ?