To use your generic class with iBATIS, just use the following syntax in your
alias:
<alias>
<typeAlias alias="List"
type="Northwind.Entities.TList`1[Northwind.Entities.Categories],
Northwind.Entities" />
</alias>
Nicolas
-----Message d'origine-----
De : Clough, Samuel (USPC.PRG.Atlanta) [mailto:[EMAIL PROTECTED]
Envoyé : jeudi 31 mai 2007 17:00
À : [email protected]; [EMAIL PROTECTED]
Objet : RE: <typeAlias> support for C# Generics?
Since no one else has chimed in, I don't know if type alias supports generics
or not, I've never tried it. It might be worth browsing the code to see if
it's immediately obvious if there's anything in there for it.
_____
From: Tony Selke [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 31, 2007 10:08 AM
To: [email protected]
Subject: <typeAlias> support for C# Generics?
I have a problem that I either don't understand or which isn't currently
supported by the iBATIS DataMapper (v.1.6.1). Any insight or recommendations
are greatly appreciated.
I use a heavily customized, generic BindingList as the collection for all of my
entity classes. For reference, the type and its super-class are shown below:
public class TList<T> : ListBase<T> where T : IEntity, new()
public abstract class ListBase<T> :
BindingList<T>, IBindingListView, IBindingList,
IList, ICloneable, IListSource, ITypedList,
IDisposable, IComponent, IRaiseItemChangedEvents,
IDeserializationCallback
If we use the traditional Northwind-based example, I have the following sqlMap
alias section in the config file associated with the Category entity/table:
<sqlMap namespace="Northwind.Entities.Categories" . . . >
<alias>
<typeAlias alias="Instance" type="Northwind.Entities.Categories,
Northwind.Entities" />
<typeAlias alias="List" type="Northwind.Entities.TList<Categories>,
Northwind.Entities" />
</alias>
. . .
</sqlMap>
When I try to initialize the mapper instance like so:
ISqlMapper map = Mapper.Instance();
I get the following inner exception:
"Could not load type from string value 'Northwind.Entities.TList<Categories>,
Northwind.Entities'.":""
I am guessing that the issue has to do with how the SqlMapper is using
reflection to check/instantiate each typeAlias. The reflection code for
dealing with generics is a bit more involved than a simple Assembly.LoadFrom()
and Assembly.CreateInstance(). More details with an example can be seen here:
http://msdn2.microsoft.com/en-us/library/b8ytshk6.aspx
While I can probably get around this issue by having "collection classes" that
inherit from a typed-instance of my TList<T>, it sort of defeats much of the
purpose of the generic concept. Is there something I am missing? Is there a
way to do this without "hacking around" it?
Tony
_____
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