c# - Reflection of generic method not working -

i have generic static method registers interface , need write using c# reflection.

services.addservice<itbroker>(new tbrokerservice()); 

i tried following code not working

type[] externtbrokerservice = assembly.loadfrom("business.dll").gettypes(); type[] externservice = assembly.loadfrom("servicemodel.dll").gettypes(); type itbroker = externitbroker[12]; methodinfo method = externservice[1].getmethods()[2]; //gets add service method methodinfo generic = method.makegenericmethod(itbroker); //make method generic            generic.invoke(null,new object[] { externtbrokerservice[0]}); //invoke service 

above code gives me generic exception of parameters.

what write way write reflection above code?

as in comments:

note externtbrokerservice[0] type , not instance of type.

having feel need include sense of other comments part of answer.

type itbroker = externitbroker[12]; 

this wrong! , sooner or later fail find type order of types in collection undetermined , can change. should this:

type itbroker = externitbroker.single(x => x.name == "itbroker"); 

this far form foolproof sure condition gives unique result.

or load type directly (assuming assemblyqualifiedname of type):

type.gettype("business.itbroker, business"); 

to find method on type there method type.getmethod 1 of overloads sufficient find method.

to create instance of type needs passed argument can use

activator.createinstance(brokerservicetype);