Where does Razor engine search for View file

Wagner · March 2020

Linqpad version 6.7.5
Basic AspNetCore Mvc snippet code

void Main()
{
    Directory.SetCurrentDirectory(Path.GetDirectoryName(Util.CurrentQueryPath));
    Host.CreateDefaultBuilder()
        .ConfigureWebHostDefaults(builder => builder.ConfigureServices(services=>services.AddControllersWithViews())
            .Configure(app=>app.UseRouting().UseEndpoints(endpoint=>endpoint.MapControllers())))
        .Build()
        .Run();
}

public class HomeController : Controller
{
    [HttpGet("/")]
    public ViewResult Index()
    {
        return View();
    }
}

The following error

info: Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker[2]
      Executed action HomeController.Index (LINQPadQuery) in 110.6171ms
info: Microsoft.AspNetCore.Routing.EndpointMiddleware[1]
      Executed endpoint 'HomeController.Index (LINQPadQuery)'
fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HLUJEGPERA0S", Request id "0HLUJEGPERA0S:00000001": An unhandled exception was thrown by the application.
System.InvalidOperationException: The view 'Index' was not found. The following locations were searched:
/Views/Home/Index.cshtml
/Views/Shared/Index.cshtml

My question is where I should put index.cshtml file?

JoeAlbahari · March 2020

You need to do two things to make this work:

call builder.UseContentRoot to tell MVC where the base folder is (the application base from which resolves the views\home\ folder)

call services.AddRazorPages().AddRazorRuntimeCompilation to set up Razor runtime compilation:

Host.CreateDefaultBuilder()
    .ConfigureWebHostDefaults (builder =>
    {
        builder.UseContentRoot (@"your base folder");
        builder.ConfigureServices (services =>
        {
            services.AddRazorPages().AddRazorRuntimeCompilation (sa =>
                Util.Framework.GetReferenceAssemblies (true)
                    .Prepend (GetType().Assembly.Location)
                    .ToList()
                    .ForEach (sa.AdditionalReferencePaths.Add));
            services.AddControllersWithViews();
        })
        .Configure (app => app.UseRouting().UseEndpoints (endpoint => endpoint.MapControllers()));
    })
    .Build()
    .Run();

Here are the extra namespace imports that you need:

Microsoft.AspNetCore.Builder
Microsoft.AspNetCore.Hosting
Microsoft.AspNetCore.Mvc
Microsoft.Extensions.DependencyInjection
Microsoft.Extensions.Hosting

You will also need to add the following NuGet package:

Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation

Note that right now, the call to Util.Framework.GetReferenceAssemblies (true) will not compile because this overload (that accepts a Boolean parameter to indicate that ASP.NET reference assemblies are required) has not yet been released in a beta. A beta with feature will be available within a few days.

Wagner · March 2020

Thanks for the quickly reply. I am looking forward for the new release.

Wagner · April 2020

I have tried the new version 6.8.1. Now the error moves to Microsoft.AspNetCore.Razor.Runtime.

fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HLUSTVQ934JD", Request id "0HLUSTVQ934JD:00000001": An unhandled exception was thrown by the application.
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.AspNetCore.Razor.Runtime, Version=3.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.
File name: 'Microsoft.AspNetCore.Razor.Runtime, Version=3.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'
   at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
   at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
   at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(MetadataToken caCtorToken, MetadataImport& scope, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, ListBuilder`1& derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
   at System.Reflection.CustomAttribute.AddCustomAttributes(ListBuilder`1& attributes, RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, ListBuilder`1 derivedAttributes)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType)
   at System.Reflection.RuntimeAssembly.GetCustomAttributes(Type attributeType, Boolean inherit)
   at System.Attribute.GetCustomAttributes(Assembly element, Type attributeType, Boolean inherit)
   at System.Reflection.CustomAttributeExtensions.GetCustomAttributes[T](Assembly element)
   at Microsoft.AspNetCore.Razor.Hosting.RazorCompiledItemLoader.LoadAttributes(Assembly assembly)
   at Microsoft.AspNetCore.Razor.Hosting.RazorCompiledItemLoader.LoadItems(Assembly assembly)
   at Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation.RuntimeViewCompiler.CompileAndEmit(String relativePath)
   at Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation.RuntimeViewCompiler.OnCacheMiss(String normalizedPath)
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Razor.Compilation.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.ViewResultExecutor.FindView(ActionContext actionContext, ViewResult viewResult)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor.ExecuteAsync(ActionContext context, ViewResult result)
   at Microsoft.AspNetCore.Mvc.ViewResult.ExecuteResultAsync(ActionContext context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|29_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)

JoeAlbahari · April 2020

In Query Properties (F4), have you ticked the checkbox Reference ASP.NET Core assemblies?

The only NuGet package you should need is Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation.

Wagner · April 2020

Yes. Here is the header for the linq

<Query Kind="Program">
  <NuGetReference>Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation</NuGetReference>
  <Namespace>Microsoft.AspNetCore</Namespace>
  <Namespace>Microsoft.AspNetCore.Builder</Namespace>
  <Namespace>Microsoft.AspNetCore.Hosting</Namespace>
  <Namespace>Microsoft.AspNetCore.Http</Namespace>
  <Namespace>Microsoft.AspNetCore.Mvc</Namespace>
  <Namespace>Microsoft.Extensions.DependencyInjection</Namespace>
  <Namespace>Microsoft.Extensions.Hosting</Namespace>
  <Namespace>Microsoft.Extensions.Logging</Namespace>
  <IncludeAspNet>true</IncludeAspNet>
</Query>

Still the error from Kestrel

fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HLV5GRQS3EK2", Request id "0HLV5GRQS3EK2:00000001": An unhandled exception was thrown by the application.
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.AspNetCore.Razor.Runtime, Version=3.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

JoeAlbahari · April 2020

I've identified the problem and will aim to get a fix out in the next day or two.

JoeAlbahari · April 2020

The ALC issue with ASP.NET assemblies has been fixed in 6.8.1:
https://www.linqpad.net/LINQPad6.aspx#beta

Let me know how you get along.

Wagner · April 2020

Terrific. It works now. But the new beta version is 6.8.2 NOT 6.8.1. I think this is just your typo.

JoeAlbahari · April 2020

Great. Let me know if there any more glitches. It would be good to make LINQPad robust in this scenario.

sdflysha · April 2020

@JoeAlbahari I have no idea but my razor engine view file seems not working:

I'm using latest 6.8.2 version, just tell me what's wrong

Where does Razor engine search for View file

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