Cannot use KeyFilter attribute to resolve registered type in asp.net core web api 2.2
I wanna use Autofac to resolve different instance of a type. I registered type in Startup.ConfigureServices by using RegisterType().Keyed and RegisterType().Named.
I can use IContainer.ResolveKeyed to resolve instance, but can't use KeyFilter to resolve instance in constructor
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
public static IContainer Container { get; private set; }
// This method gets called by the runtime. Use this method to add services to the container.
public IServiceProvider ConfigureServices(IServiceCollection services)
{
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2).AddControllersAsServices();
var builder = new ContainerBuilder();
builder.Populate(services);
builder.RegisterType<Foobar>().UsingConstructor(typeof(string)).WithParameter("name", "Eric").Named<Foobar>("Eric").SingleInstance();
builder.RegisterType<Foobar>().UsingConstructor(typeof(string)).WithParameter("name", "Fred").Keyed<Foobar>("Fred").SingleInstance();
Container = builder.Build();
var serviceProvider = new AutofacServiceProvider(Container);
return serviceProvider;
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseHttpsRedirection();
app.UseMvc();
}
}
[Route("api/[controller]")]
[ApiController]
public class ValuesController : ControllerBase
{
private readonly Foobar fb1;
private readonly Foobar fb2;
public ValuesController([KeyFilter("Eric")]Foobar fbEric, [KeyFilter("Fred")]Foobar fbFred)
{
// KeyFilter not work
fb1 = fbEric;
fb2 = fbFred;
// Container.ResolvedKeyed work
fb1 = Startup.Container.ResolveKeyed<Foobar>("Eric");
fb2 = Startup.Container.ResolveNamed<Foobar>("Fred");
}
[HttpGet]
public ActionResult<IEnumerable<string>> Get()
{
return new string[] { fb1.Say(), fb2.Say() };
}
}
Use KeyFilter will throw below exceptions:
An unhandled exception has occurred while executing the request.
Autofac.Core.DependencyResolutionException: An exception was thrown while activating Autofac.MI.WebApi.Controllers.ValuesController. ---> Autofac.Core.DependencyResolutionException: None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'Autofac.MI.WebApi.Controllers.ValuesController' can be invoked with the available services and parameters:
Cannot resolve parameter 'Autofac.MI.ClassLib.Foobar fbEric' of constructor 'Void .ctor(Autofac.MI.ClassLib.Foobar, Autofac.MI.ClassLib.Foobar)'.
at Autofac.Core.Activators.Reflection.ReflectionActivator.GetValidConstructorBindings(IComponentContext context, IEnumerable`1 parameters) in C:\projects\autofac\src\Autofac\Core\Activators\Reflection\ReflectionActivator.cs:line 160
at Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable`1 parameters) in C:\projects\autofac\src\Autofac\Core\Activators\Reflection\ReflectionActivator.cs:line 120
at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters, Object& decoratorTarget) in C:\projects\autofac\src\Autofac\Core\Resolving\InstanceLookup.cs:line 117
--- End of inner exception stack trace ---
at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters, Object& decoratorTarget) in C:\projects\autofac\src\Autofac\Core\Resolving\InstanceLookup.cs:line 135
at Autofac.Core.Resolving.InstanceLookup.Execute() in C:\projects\autofac\src\Autofac\Core\Resolving\InstanceLookup.cs:line 83
at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters) in C:\projects\autofac\src\Autofac\Core\Resolving\ResolveOperation.cs:line 131
at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters) in C:\projects\autofac\src\Autofac\Core\Resolving\ResolveOperation.cs:line 84
at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance) in C:\projects\autofac\src\Autofac\ResolutionExtensions.cs:line 1041
at Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable`1 parameters) in C:\projects\autofac\src\Autofac\ResolutionExtensions.cs:line 871
at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
at Microsoft.AspNetCore.Mvc.Controllers.ServiceBasedControllerActivator.Create(ControllerContext actionContext)
at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
For KeyFilter, you need to register the service with WithAttributeFiltering.
For AddControllersAsServices, it only register the service to service collection, but it did not register with WithAttributeFiltering.
Try code below:
services.AddMvc().AddControllersAsServices().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
var builder = new ContainerBuilder();
builder.Populate(services);
builder.RegisterType<Foobar>().UsingConstructor(typeof(string)).WithParameter("name", "Eric").Named<Foobar>("Eric").SingleInstance();
builder.RegisterType<Foobar>().UsingConstructor(typeof(string)).WithParameter("name", "Fred").Keyed<Foobar>("Fred").SingleInstance();
var controllers = typeof(Startup).Assembly.GetTypes().Where(t => t.BaseType == typeof(ControllerBase)).ToArray(); // for api controller
//var controllers = typeof(Startup).Assembly.GetTypes().Where(t => t.BaseType == typeof(Controller)).ToArray(); // for mvc controller
builder.RegisterTypes(controllers).WithAttributeFiltering();
Container = builder.Build();