FluentValidation.AspNetCore is throwing during bootstrap

[juchom]

FluentValidation version

11.1

ASP.NET version

Asp.Net Core 6.0

Summary

After upgrading from 11.0.3 to 11.1.0 this issue arises when bootstrapping the application.

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at FluentValidation.AspNetCore.FluentValidationViewOptionsSetup.Configure(MvcViewOptions options) in /Users/jskinner/code/FluentValidation/src/FluentValidation.AspNetCore/FluentValidationMvcExtensions.cs:line 170
   at Microsoft.Extensions.Options.OptionsFactory`1.Create(String name)
   at Microsoft.Extensions.Options.UnnamedOptionsManager`1.get_Value()
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageRequestDelegateFactory..ctor(PageActionInvokerCache cache, IModelMetadataProvider modelMetadataProvider, ITempDataDictionaryFactory tempDataFactory, IOptions`1 mvcOptions,
 IOptions`1 mvcViewOptions, IPageHandlerMethodSelector selector, DiagnosticListener diagnosticListener, ILoggerFactory loggerFactory, IActionResultTypeMapper mapper, IActionContextAccessor actionContextAccessor)
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageRequestDelegateFactory..ctor(PageActionInvokerCache cache, IModelMetadataProvider modelMetadataProvider, ITempDataDictionaryFactory tempDataFactory, IOptions`1 mvcOptions,
 IOptions`1 mvcViewOptions, IPageHandlerMethodSelector selector, DiagnosticListener diagnosticListener, ILoggerFactory loggerFactory, IActionResultTypeMapper mapper)
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Span`1& arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitIEnumerable(IEnumerableCallSite enumerableCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(Type serviceType)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService[T](IServiceProvider provider)
   at Microsoft.AspNetCore.Builder.RazorPagesEndpointRouteBuilderExtensions.EnsureRazorPagesServices(IEndpointRouteBuilder endpoints)
   at Microsoft.AspNetCore.Builder.RazorPagesEndpointRouteBuilderExtensions.MapRazorPages(IEndpointRouteBuilder endpoints)
   at Program.<Main>$(String[] args) in C:\dev\WebApplication5\WebApplication5\Program.cs:line 33

Steps to Reproduce

Create a new Razor Pages project, add FluentValidation.AspNetCore packages

Update Program.cs

using FluentValidation;
using FluentValidation.AspNetCore;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();

builder.Services.AddFluentValidationAutoValidation(cfg =>
    cfg.DisableDataAnnotationsValidation = true
);
builder.Services.AddFluentValidationClientsideAdapters();
builder.Services.AddValidatorsFromAssemblyContaining<Program>();


var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();

app.Run();

[JeremySkinner]

Thanks for reporting this, it was a side effect of splitting AddFluentValidationClientsideAdapters into a separate method. You can temporarily work around it by passing in a configuration expression: AddFluentValidationClientsideAdapters(cfg => {}) and I'll publish a new release with a proper fix in a few minutes.

[JeremySkinner]

Fixed in 11.1.1

[juchom]

Thanks a lot for this quick fix ! It works fine !