Automatically bind interfaces using AutoFac

Question

I have some classes like UserQuery, CustomerQuery implementing interfaces like IUserQuery, ICustomerQuery respectively. In my binding configuration I need to bind every interface with the respectively query:

builder.RegisterType<UserQuery>().As<IUserQuery>().InstancePerRequest();
builder.RegisterType<CustomerQuery>().As<ICustomerQuery>().InstancePerRequest();

This is working pretty fine, but I was wondering if there is a way to make a convention-based binding in place of binding every single classe XXX[Query] -> [I]XXX[Query].

I'm using AutoFac as my DI container.

Answer 1

I'm not a AutoFac experienced user. However after some research a tested the code below with success:

var assembly = Assembly.GetExecutingAssembly();

builder
    .RegisterAssemblyTypes(assembly)
    .AssignableTo<IQuery>()
    .AsImplementedInterfaces()
    .InstancePerRequest();

The IQuery interface above is just a tag interface that should be inherited from every query interface that you have. Using your example:

Interfaces

IUserQuery: IQuery
ICustomerQuery: IQuery

Classes

UserQuery: IUserQuery
CustomerQuery: CustomerQuery