Invoke Member of Generic Type

[pa182]

Hi, my application has the following interfaces:

public IDataContext {
IRepository<T> Repository<T>() where T : class;
}

public interface IRepository<T> where T : class {
T GetById(int id);
}

I have my own implementation setup and initialized using an ioc container. Usually i'd be able to say

var context = ServiceLocator.Current.GetInstance<IDataContext>();
context.Repository<Role>().GetById(1);

Which works fine but i have a case where i don't know the generic type until runtime. Ideally i'd like to be able to say:

Type myType = typeof(Role); // This is just shown as an example
var context = ServiceLocator.Current.GetInstance<IDataContext>();
context.Repository<myType>().GetById(1);

However this does not work. I'd imagine i'd have to use reflection to solve this unless i'm missing something obvious. I'd really appreciate it if someone could help. Thanks

 

[jmeckley]

correct, if you don't know the type until runtime, you cannot use generics. in that case you would need to do someting like

object o = context.Repostory(mytype).Get(id);

or

object o = context.Repostory.Get(id, mytype);

a third option is to create a supertype for example

abstract class User
{
}
class SuperUser : User
{
}
class NormalUser : User

var u = context.Repostory<User>.Get(id);
and the context/mappings would know whether to resolve a super or normal user.
[code]

Jason Meckley
Programmer

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