overloading explicit CAST operator with user-defined interface parameter

问题

At these given classes

[ActiveRecord]
public class BaseMoo : ActiveRecordBase

[ActiveRecord]
public class Foo : BaseMoo { }

somewhere in the code i do

var fooObj = new Foo();
// do something with fooObj
BaseMoo obj = fooObj;

here i try to cast

var newFooObj = (Foo)obj; // and goes well

if i changes the classes to this:

[ActiveRecord(Lazy=true)]
public class BaseMoo : ActiveRecordBase

[ActiveRecord(Lazy=true)]
public class Foo : BaseMoo { }

making it Lazyest at these lines:

var fooObj = new Foo();
// do something with fooObj
BaseMoo obj = fooObj;

the AR creates non a Foo instance instead a BaseMooProxy object

var newFooObj = (Foo)obj; // this throws an invalidcast exception

As sugested by @Adam Houldsworth in this question

I overloads the Foo explicit operator in this way

public static explicit operator Foo(NHibernate.Proxy.INHibernateProxy nhProxy)
{
    var resultObj = (Foo)nhProxy.InSomeWayIGetTheOriginalObject(); // InSomeWayIGetTheOriginalObject() is not a real method, only for simplify
    return resultObj;
}

but i get an error in the operator overload parameter

NHibernate.Proxy.INHibernateProxy nhProxy

user-defined conversion from interface

QUESTION:

how can i do to explicit convert from BaseMooProxy (NHibernate.Proxy.INHibernateProxy) to Foo?
As know it's not possible to overloads the "is" operator, is there a way to do work the "obj is Foo" ?

As the consumer application is 3th part customer It's not possible to changes the way how the application casts the classes objects.

thanks in advance.

来源：https://stackoverflow.com/questions/8833227/overloading-explicit-cast-operator-with-user-defined-interface-parameter

标签

nhibernate

casting

proxy

overloading