View not found running on .Net6 rc1

[En3Tho]

Describe the bug

After upgrading to .Net 6 rc1 a "View not found exception started to appear"

3.1.406 (Microsoft.AspNetCore.App 3.1.18) -> ok
5.0.400 (Microsoft.AspNetCore.App 5.0.9) -> ok
6.0.100-preview.7.21379.14 (Microsoft.AspNetCore.App 6.0.0-preview.7.21378.6) -> ok
6.0.100-rc.1.21417.9 (Microsoft.NETCore.App 6.0.0-rc.1.21415.6) -> exception

It's an F# project with razor views. Views are each set to "Content", do not copy.

I heard there were changes to Razor compiler.
Do I need to fix something in my project files or maybe in Sdk.Razor.CurrentVersion.props?

Exception text:

Caught exception in ExceptionHandlerMiddleware System.AggregateException: Oneor more errors occurred. (One or more errors occurred. (The view '/Views/Login.cshtml' was not found. The following locations were searched:/Views/Login.cshtml))
---> System.AggregateException: One or more errors occurred. (The view '/Views/Login.cshtml' was not found. The following locations were searched:/Views/Login.cshtml)
---> System.InvalidOperationException: The view '~/Views/Login.cshtml' was not found. The following locations were searched: ~/Views/Login.cshtml
at Microsoft.AspNetCore.Mvc.ViewEngines.ViewEngineResult.EnsureSuccessful(IEnumerable`1 originalLocations)
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.g__Logged|22_0(ResourceInvoker invoker, ActionResult result)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeNextResultFilterAsync>g__Awaited|30_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.InvokeResultFilter
s()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceEx
ecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next,Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Logged|17_1(ResourceInvoker invoker)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Logged|17_1(ResourceInvoker invoker)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
--- End of inner exception stack trace ---
--- End of inner exception stack trace ---.

[En3Tho]

#35137 maybe this is somehow connected? Razor runtime compilation is basically what we are doing now because for some reason there is no way to turn on razor static compilation for fsproj.

[En3Tho]

One more thing:
Views folder is in fsproj folder.
Before compiling with Net6 I had compiled my app with .Net 5
Running from bin/net5.0/... produces the same result now (View not found)
To make app run normal again it requires full recompilation on .Net5

[pranavkm]

@En3Tho I just tried this using a build of the RC1 SDK and don't see an issue building 5.0 or 6.0 apps. Here's where you could grab one of these if you'd like to try it out - https://github.com/dotnet/installer#installers-and-binaries.

If you continue seeing the issue after you update, I'd be happy to investigate further. To do so, please share a minimal app, preferably as a GitHub repo, that reproduces the problem.

[En3Tho]

Hi. Issue is not with building the app. It builds and runs (SignaR Hubs start, Controllers work etc). The only thing that fails is views. I will try to make a repo project. C# has supported Razor views static compilation for a long time, F# did not. I guess now that you've disabled dynamic compilation of Razor views in .Net6 and static is the only option, F# simply fails to build views dynamically because there is no such option anymore. Am I somewhat right in this?

[davidfowl]

Can you share the code? Are you using 2 projects?