Bind Generic Type Implementations In Autofac

BindGenericTypeImplementationsAutofac.cs

/*
If you have...

IAnInterface<T> where T : IAnotherInterface

and the interface is implemented by a base class, that the class inherits...

ThisType : TheBaseClass<TypeImplementingAnotherInterface>

rather than do...

builder.Register<ThisType>().As<AnInterface<TypeImplementingAnotherInterface>();
builder.Register<ThatType>().As<AnInterface<YetAnotherTypeImplementingAnotherInterface>();

*/


var baseType = typeof(TheBaseClass<>);

            var typesThatInheritTheBase = from x in Assembly.GetAssembly(baseType).GetTypes()
                                        let y = x.BaseType
                                        where !x.IsAbstract && !x.IsInterface &&
                                        y != null && y.IsGenericType &&
                                        y.GetGenericTypeDefinition() == baseType
                                        select x;

            foreach (var type in typesThatInheritTheBase.ToArray())
            {
                var resultType =
                    type.GetInterface(typeof(IAnInterface<>).Name)
                        .GenericTypeArguments.First();
               var genericType = typeof(IAnInterface<>).MakeGenericType(resultType);
                builder.RegisterType(type).As(genericType);