Controllers in dynamic assembly

[imranbaloch]

Reposting from https://forums.asp.net/t/2106790.aspx?Controllers+in+dynamic+assembly

Hi. I am trying to create some dynamic convention based API controllers like so:

// Create some controllers via Reflection.Emit inside dynamic assembly
var assembly = DynamicControllers.CreateAssembly(dynamicControllerConfig);
var builder = services.AddMvc().AddApplicationPart(assembly);

That works well as long as there are no views involved. When I try to access a controller with a view from my main assembly...

public class HelpController : Controller {
    // ..
    public IActionResult Index() => View();
    // ..
}

...I get this exception:

System.NotSupportedException: The invoked member is not supported in a dynamic assembly.
   at System.Reflection.Emit.InternalAssemblyBuilder.GetManifestResourceStream(String name)
   at Microsoft.Extensions.DependencyModel.DependencyContextLoader.GetResourceStream(Assembly assembly, String name)
   at Microsoft.Extensions.DependencyModel.DependencyContextLoader.LoadAssemblyContext(Assembly assembly, IDependencyContextReader reader)
   at Microsoft.Extensions.DependencyModel.DependencyContextLoader.Load(Assembly assembly)
   at Microsoft.Extensions.DependencyModel.DependencyContext.Load(Assembly assembly)
   at Microsoft.AspNetCore.Mvc.ApplicationParts.AssemblyPart.GetReferencePaths()
   at Microsoft.AspNetCore.Mvc.Razor.Compilation.MetadataReferenceFeatureProvider.PopulateFeature(IEnumerable`1 parts, MetadataReferenceFeature feature)
   at Microsoft.AspNetCore.Mvc.ApplicationParts.ApplicationPartManager.PopulateFeature[TFeature](TFeature feature)
   at Microsoft.AspNetCore.Mvc.Razor.Internal.DefaultRoslynCompilationService.GetCompilationReferences()
   at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
   at Microsoft.AspNetCore.Mvc.Razor.Internal.DefaultRoslynCompilationService.get_CompilationReferences()
   at Microsoft.AspNetCore.Mvc.Razor.Internal.DefaultRoslynCompilationService.Compile(RelativeFileInfo fileInfo, String compilationContent)
   at Microsoft.AspNetCore.Mvc.Razor.Internal.RazorCompilationService.Compile(RelativeFileInfo file)
   at Microsoft.AspNetCore.Mvc.Razor.Internal.CompilerCache.CreateCacheEntry(String relativePath, String normalizedPath, Func`2 compile)
--- End of stack trace from previous location where exception was thrown ---
   ...
   at Microsoft.AspNetCore.Mvc.Razor.Internal.CompilerCache.GetOrAdd(String relativePath, Func`2 compile)
   at Microsoft.AspNetCore.Mvc.Razor.Internal.DefaultRazorPageFactoryProvider.CreateFactory(String relativePath)
   at Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine.CreateCacheResult(HashSet`1 expirationTokens, String relativePath, Boolean isMainPage)
   at Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine.OnCacheMiss(ViewLocationExpanderContext expanderContext, ViewLocationCacheKey cacheKey)
   at Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine.LocatePageFromViewLocations(ActionContext actionContext, String pageName, Boolean isMainPage)
   at Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine.FindView(ActionContext context, String viewName, Boolean isMainPage)
   at Microsoft.AspNetCore.Mvc.ViewEngines.CompositeViewEngine.FindView(ActionContext context, String viewName, Boolean isMainPage)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.Internal.ViewResultExecutor.FindView(ActionContext actionContext, ViewResult viewResult)
   at Microsoft.AspNetCore.Mvc.ViewResult.<ExecuteResultAsync>d__26.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   ...
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeResultAsync>d__32.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   ...
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeResultFilterAsync>d__31.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAllResultFiltersAsync>d__29.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   ...
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeResourceFilterAsync>d__23.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   ...
   at Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   ...
   at Microsoft.AspNetCore.Server.IISIntegration.IISMiddleware.<Invoke>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   ...
   at Microsoft.AspNetCore.Hosting.Internal.RequestServicesContainerMiddleware.<Invoke>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   ...
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Http.Frame`1.<RequestProcessingAsync>d__2.MoveNext()

Apparently RazorViewEngine tries to search the path of the dynamic assembly for view files which must obviously fail as that assembly has no path. How can I configure MVC to exclude that assembly from possible candidates for view file lookups?

[pranavkm]

Dup of aspnet/Mvc#5487 which was fixed in aspnet/Mvc@24d5dfb. Is updating the application to 1.1.0 a potential solution for you?