On Thursday, August 11, 2016 at 7:43:27 AM UTC-4, Rasmoo wrote:
>
> You can't cast the proxy. You can cast the proxied object. Therein lies
> the difference.
>
You haven't told me anything I don't already know, and/or learned about the
nature of NHibernate and the proxied domain objects.
I try to avoid casting anyways. I'd rather use a visitor pattern as it
> maintains completeness.
>
Thank you.
On Thu, Aug 11, 2016 at 1:33 PM, mwpowellhtx <mwpow...@gmail.com
> <javascript:>> wrote:
>
>>
>>
>> On Thursday, August 11, 2016 at 7:23:35 AM UTC-4, Rasmoo wrote:
>>>
>>> That's exactly Oskar's trick: You call the proxy, into the proxied
>>> object and get it to cast itself.
>>>
>>
>> No, that's not what Oskar wrote, one the one hand; see below:
>>
>> public TCastTarget As<TCastTarget>()
>> {
>> return (TCastTarget)this;
>> }
>>
>> This is not any different than what I attempted in the LINQ statement.
>>
>> On the other hand, introducing an "UnproxiedObject" virtual property is
>> too much. I want to keep the model itself as clean as possible without
>> inverting proxy dependency inversions more than is necessary.
>>
>> Appreciate the constructive input, though.
>>
>> cup.Juice.As<AppleJuice>()
>>>
>>> Try it. :-)
>>>
>>> Alternative, you can return the inner, unproxied object, by adding a
>>> method like this to the base class:
>>>
>>> public virtual object UnproxiedObject { get { return this; } }
>>>
>>> Then it's
>>>
>>> cup.Juice.UnproxiedObject as AppleJuice
>>>
>>>
>>> On Thu, Aug 11, 2016 at 12:47 PM, mwpowellhtx <mwpow...@gmail.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> On Wednesday, August 10, 2016 at 1:20:15 PM UTC-4, Oskar Berggren wrote:
>>>>>
>>>>> You can put something like this in relevant base class:
>>>>>
>>>>> public TCastTarget As<TCastTarget>()
>>>>> {
>>>>> return (TCastTarget)this;
>>>>> }
>>>>>
>>>>
>>>> Do you understand what's going on with Proxying? You don't see it in
>>>> your code, but what you end up with is something like this:
>>>>
>>>> class JuiceProxy : Juice { ... }
>>>> class AppleJuiceProxy : AppleJuice { ... }
>>>> class OrangeJuiceProxy : OrangeJuice { ... }
>>>>
>>>> Something like that, if memory serves, but I haven't verified the
>>>> actual inheritance tree.
>>>>
>>>> And since Cup wants a Juice, JuiceProxy fits the bill, but there is no
>>>> reasonable way for JuiceProxy to be side-cast into the expected
>>>> AppleJuice,
>>>> much less AppleJuiceProxy, without losing necessary hierarchical details.
>>>>
>>>> Then you don't have to turn off proxying.
>>>>>
>>>>
>>>>> /Oskar
>>>>>
>>>>>
>>>>>
>>>>> 2016-08-10 18:02 GMT+01:00 Michael Powell <mwpow...@gmail.com>:
>>>>>
>>>>>> On Wed, Aug 10, 2016 at 11:55 AM, Michael Powell <mwpow...@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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>>>>>
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