Question

I have a ViewModel, it takes two parameters in the constructor that are of the same type:

public class CustomerComparerViewModel
{
    public CustomerComparerViewModel(CustomerViewModel customerViewModel1,
                                     CustomerViewModel customerViewModel2)
    {

    }
}

public class CustomerViewModel
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

If I wasn’t using IOC I could just new up the viewmodel and pass the sub-viewmodels in. I could package the two viewmodels into one class and pass that into the constructor but if I had another viewmodel that only needed one CustomerViewModel I would need to pass in something that the viewmodel does not need.

How do I go about dealing with this using IOC? I’m using Ninject btw.

Thanks

Answer 1

Here’s how to do it in Ninject:

Container.Bind<CustomerViewModel>().ToSelf().WhenTargetHas<CustomerA>();
Container.Bind<CustomerViewModel>().ToSelf().WhenTargetHas<CustomerB>();

Then in the constructor of the class you are using them in:

public class CustomerComparerViewModel
{
    public CustomerComparerViewModel([CustomerA]CustomerViewModel customerA,
                                     [CustomerB]CustomerViewModel customerB)
    {

    }
}