c# - Unity IOC and Factory pattern inside a large loop -

i want use factory pattern in application receive huge(500k) list , lets list,of objects , loop through it, 1 of property(seattype) decides class process list, if seat type premium handled different class , economy , on...

class bus {     public seattype type { get; set; } } 

since check on seat type , hence finding processor happening inside loop whats best way resolve/find instance of property has process bus?

i know can group list seat type , process it, interested know if there better way without grouping , using loop.

thanks in advance!!!

edit:

in case need processors @ 5th level, e.g. in loop calling classa.methoda , methoda calls classb.methodb , on till classe.methode.

i need processsors in classe 4 level inside loop , don't want pass dictionary of processors classa classb , on.

please help!

i use dictionary has mapping between seattype , processing class. , in each iteration take correct processor dictionary.

e.g.

dictionary<steattype, iprocessor> processors = new dictionary<steattype, iprocessor>();  (int = 0; < buses.length; i++) {     bus b = buses[i];     iprocessor p = processors[b];     // p.process(b); } 

if don't want pass processors class a class e can create helper class singleton , holds processors. on each level can call singleton specific processor.

or maybe when possible think looks quite better inject processors in constructor 5 classes a e possible use different processor dictionaries on different levels ;)