c# - How to resolve the correct type from the container (static type vs runtime type)? -

i have problem resolving dependency in autofac. may related co/contra variance on type.

the following program returns 0, 1. means 2 call resolve not returns same types (whhereas same object serves type) expect return: 1,1. (the difference static type of var different, there way use runtime type ?)

thanks

icontainer _container;  void main() {     var builder = new containerbuilder();     builder.registertype<ahandler>().as<ihandler<a>>();     _container = builder.build();      ibase = new a();     console.writeline(resolve(a));     b = new a();     console.writeline(resolve(b)); }  int resolve<t>(t a) t:ibase {     return _container.resolve<ienumerable<ihandler<t>>>().count(); }  // define other methods , classes here interface ibase{} interface ihandler<t> t:ibase {}  class : ibase{}  class ahandler : ihandler<a>{} 

you'll need sort of runtime resolution of type. e.g. using dynamic keyword:

ibase = new a(); console.writeline(resolve((dynamic)a)); b = new a(); console.writeline(resolve((dynamic)b)); 

or using reflection:

int resolvedynamic(ibase a) {     methodinfo method = typeof(icontainer).getmethod("resolve");     var handlertype = typeof(ihandler<>).makegenerictype(a.gettype());     var enumerabletype = typeof(ienumerable<>).makegenerictype(handlertype);     methodinfo generic = method.makegenericmethod(enumerabletype);      var result = (ienumerable<object>)generic.invoke(_container, null);     return result.count(); }