Autofac DynamicProxy with type parameters

Question

I want to use Autofac's type interception to cache method results.

I registered my types with code below

builder.RegisterAssemblyTypes(dependentAssemblies)
            .Where(x => x.GetCustomAttributes(typeof(InterceptAttribute), true).Any())
            .WithParameters(parameters)
            .AsImplementedInterfaces()
            .EnableInterfaceInterceptors()
            .InstancePerRequest();

And it works fine. But this is Interface interception. When i register types with

builder.RegisterAssemblyTypes(dependentAssemblies)
            .Where(x => x.GetCustomAttributes(typeof(InterceptAttribute), true).Any())
            .WithParameters(parameters)
            .AsImplementedInterfaces()
            .EnableClassInterceptors()
            .InstancePerRequest();

I get error

None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'Castle.Proxies.MyServiceProxy' can be invoked with the available services and parameters: Cannot resolve parameter 'System.String ' of constructor 'Void .ctor(Castle.DynamicProxy.IInterceptor[], System.String, System.String, NLog.ILogger)'.

My params list is equal in both cases and is enough to create MyService and looks like

var parameters = new[]
        {
            new NamedParameter("name1", "value1"),
            new NamedParameter("name2", "value2")
        };

Have i forgot something?

Answer 1

The interceptors get wrapped around services (the As<T> part), not components (the concrete thing getting registered). You're registering things as interfaces but you're not enabling interface interception , you're enabling class interception . There aren't any classes to intercept.

Either also add .AsSelf() to that registration statement or switch back to EnableInterfaceInterceptors() .