Resolve an object from Windsor container that requires a data model dependency

Question

I have an AccountViewModel object which requires two arguments in its constructor: a DataStore object registered in the WindsorContainer, and an Account data model object.

Now, when the user selects an account in a list of accounts, I need to resolve an AccountViewModel object from the container using the selected account.

But the problem is the account is not registered in the container, and when I register it on the SelectionChanged event, I ran into a duplicate registration error.

I also investigated the various life cycles for each dependency but I still can't figure out a solution (I'm obviously a beginner in using IoC frameworks since I prefer my own factory class).

Answer 1

Keep AccountViewModel as is, but use a factory for dependency injection:

public interface IAccountViewModelFactory
{
    AccountViewModel Create(AccountModel model);
}

You can then implement (and register with your DI Container) the factory like this:

public class AccountViewModelFactory : IAccountViewModelFactory
{
    public AccountViewModelFactory(IAccountService accountService)
    {
        AccountService = accountService;
    }

    public IAccountService AccountService { get; }

    public AccountViewModel Create(AccountModel model)
    {
        return new AccountViewModel(AccountService, model);
    }
}

Assuming that AccountViewModel looks like this:

public class AccountViewModel
{
    public AccountViewModel(IAccountService accountService, AccountModel model)
    {
        AccountService = accountService;
        Model = model;
    }

    public IAccountService AccountService { get; }
    public AccountModel Model { get; }
}