SetOperatingAssembly makes CompileRenderAsync() to crash

[olivierr91]

My solution consist of 2 projects:

• MyApp.Rest
• MyApp.Core

Core uses Razor templating to generate emails and reports. Rest is a WebAPI only and references Core. Rest has the startup file, where RazorLight configuration takes place. Core contains the RazorViewRender, which in turns uses RazorLightEngine.

Using SetOperatingAssembly to an assembly of MyApp.Core (so resx files and other stuff are picked up correctly) results in a System.NullReferenceException

Startup.cs:

            services.AddRazorLight(() => {
                return new RazorLightEngineBuilder()
                      .SetOperatingAssembly(Assembly.GetAssembly(typeof(RazorViewRenderer)))
                      .UseFilesystemProject(AppContext.BaseDirectory)
                      .UseMemoryCachingProvider()
                      .Build();
            });

RazorViewRender.cs:

        public async Task<string> RenderAsync<TModel>(string name, TModel model) {
            return await _engine.CompileRenderAsync(name, model);
        }

Stack Trace:

"Object reference not set to an instance of an object."
   at RazorLight.Compilation.DefaultMetadataReferenceManager.Resolve(DependencyContext dependencyContext)
   at RazorLight.Compilation.RoslynCompilationService.EnsureOptions()
   at RazorLight.Compilation.RoslynCompilationService.get_ParseOptions()
   at RazorLight.Compilation.RoslynCompilationService.CreateSyntaxTree(SourceText sourceText)
   at RazorLight.Compilation.RoslynCompilationService.CreateCompilation(String compilationContent, String assemblyName)
   at RazorLight.Compilation.RoslynCompilationService.CompileAndEmit(IGeneratedRazorTemplate razorTemplate)
   at RazorLight.Compilation.RoslynCompilationService.CompileAsync(IGeneratedRazorTemplate razorTemplate)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at RazorLight.Compilation.TemplateFactoryProvider.<CompileAsync>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at RazorLight.Compilation.TemplateFactoryProvider.<CreateFactoryAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at RazorLight.RazorLightEngine.<CompileTemplateAsync>d__14.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at RazorLight.RazorLightEngine.<CompileRenderAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at SitkaWebApp.Server.Core.Services.Documents.RazorViewRenderer.<RenderAsync>d__2`1.MoveNext() in C:\Users\orobe\Documents\IT Services\Customers\000055 - SITKA\Web App\SitkaWebApp.Server.Core\Services\Documents\RazorViewRenderer.cs:line 13

[toddams]

Issue is not created properly, must follow the template - https://github.com/toddams/RazorLight/issues/new?template=bug_report.md