On Wed, Aug 10, 2016 at 11:55 AM, Michael Powell <mwpowell...@gmail.com> wrote:
> Hello,
>
> I have a use case where I'd like to cast an abstract base class to a
> child class in order to verify one of the child class properties.
In my joining table mapping, in this case the reference from Cup to
Juice, I do something like this, which seems to work, but will want to
test it heavily.
References(x => x.Juice, "JuiceId")
.LazyLoad(Laziness.NoProxy)
.Not.Nullable();
And this seems to do the trick; at least there is literally no proxy
involved and I can do the casting that I want to do. I might lose some
proxiness about its usage, though, so need to test it more thoroughly.
> Consider, an albeit somewhat contrived example:
>
> abstract class Juice { }
> class AppleJuice : Juice { public virtual double Acidity { get; set; } }
> class OrangeJuice : Juice { public virtual double Tanginess { get; set; } }
>
> class Cup { public virtual Juice Juice { get; set; } }
>
> I would like to test the Juice in the Cup in this manner:
>
> Cup cup = ...;
> if (((ApplyJuice) cup.Juice).Acidity > 1.5)
> {
> // Respond to acidity...
> }
>
> However, what I am finding is that the cast doesn't work "properly",
> due to the proxies involved, I get InvalidCastException:
>
> "Unable to cast object of type 'JuiceProxy' to type 'AppleJuice'"
>
> Which I suppose is not surprising, but I wondered with the support for
> class hierarchies, is there a recommended workaround? Do I need to do
> some other form(s) of casting, or have some event handlers connecting
> with ISession bits?
>
> Thanks!
>
> Regards,
>
> Michael Powell
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