Custom binder for Validated<T> parameters for Web API 2, used in LucAdm

BindingConfig

    public static class BindingConfig
    {
        public static void Register(HttpConfiguration config)
        {
            config.ParameterBindingRules.Add(FindDescriptor);
        }

        private static HttpParameterBinding FindDescriptor(HttpParameterDescriptor descriptor)
        {
            if (descriptor.ParameterType.IsGenericType &&
                descriptor.ParameterType.GetGenericTypeDefinition() == typeof (Validated<>))
            {
                return
                    (HttpParameterBinding)
                        Activator.CreateInstance(
                            typeof (PrimitiveBinder<>).MakeGenericType(descriptor.ParameterType.GetGenericArguments()[0]),
                            descriptor);
            }
            return null;
        }
    }


    public class PrimitiveBinder<T> : HttpParameterBinding where T : struct
    {
        public PrimitiveBinder(HttpParameterDescriptor descriptor)
            : base(descriptor)
        {
        }

        public override Task ExecuteBindingAsync(ModelMetadataProvider metadataProvider, HttpActionContext actionContext,
            CancellationToken cancellationToken)
        {
            var value = actionContext.RequestContext.RouteData.Values[Descriptor.ParameterName];
            var validatedPrimitive = Activator.CreateInstance(typeof (Validated<>).MakeGenericType(typeof (T)), value);
            actionContext.ActionArguments[Descriptor.ParameterName] = validatedPrimitive;
            var tsc = new TaskCompletionSource<object>();
            tsc.SetResult(null);
            return tsc.Task;
        }
    }