'Autofac Circular Component Dependency Detected' Error

Question

I am new to IoC and am using Autofac in my current project.

I have the following 2 classes:

public class UserService : IUserService
{
    private rea         


        

Answer 1

Autofac has documentation on how to handle circular dependencies that might help here. You can get it to work if you follow the guidance there (which boils down to: make one of the dependencies a property rather than a constructor dependency).

Answer 2

If a UserService needs an IMailService and a MailService needs an IUserService you have a dependency loop. I see a couple of options:

1. Does your UserService need an IMailService right away? Could you pass one in when it needs to send a message?

2. Can either query the resolver on-demand - that is, don't pass IUserService to MailService in the constructor but rather code MailService to resolve IUserService when it needs it?