I am having problems using Windsor (ver 3.2.1) for the following IoC
scenario:
I have several classes that each extend a base class to provide additional
functionality based on the data type provided. Suppose for example:
public class BaseModel
{
public BaseModel(object arg)
{
Name = arg.ToString();
}
public string Name { get; protected set; }
}
public class AMoreDerivedModel1 : BaseModel
{
public AMoreDerivedModel1(SomeData arg)
: base(arg)
{
Name = arg.ABetterName;
}
}
I then wish to resolve a most "suitable" (more derived) instance based on
the constructor argument type. Specifically I wish to have a factory that
can provide an instance based on the argument passed in. For example:
Func<object, BaseModel> resolver; // provided by container
var res1 = resolver(new SomeData()); // Would resolve to a
AMoreDerivedModel1 type because a SomeData was passed in
var res2 = resolver("A name"); // Would "fall back" and resolve to the more
generic BaseModel type
So far I have tried both delegate and interface factories and both have the
same result (not surprisingly) of always resolving to a BaseModel type.
I tried registering a ISubDependencyResolver and then a IHandlersFilter,
but these were only get called when the factory is resolved, not when the
factory resolves an instance.
I registered the BaseModel, and then registered derived classes with
Forward<BaseModel>.
The only way I found to achieve what I wanted was with UsingFactoryMethod
for the BaseModel, wherein I GetAssignableHandlers(typeof(BaseModel)) and
search through all of the handler services till I find the best one (most
derived constructor argument) and then resolve it.
In my real world scenario I want to use this approach for populating nodes
in a TreeView. The "more derived" classes have the option of adding
additional nodes & data based on the data type. As new data types are added
to the project, a viewer class (that extends BaseModel) can also be written
for generating view information.
Is the approach I came up with reasonable, or is the concept of what I'm
doing flawed?
Thanks,
Robert Turner
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