c# - ConfigureAutomapper to map contents of collection-property, but use destination collection object -

i have class

class {   public a()   {     collectionprop = new list<b>();   }   public icollection<b> collectionprop {get; private set;} } 

lets want map -> a, cloning mechanism, dont want automapper attempt create collectionprop, should use collectionprop exists in destination object (created constructor), clone 'b' objects new instance of a.

how do this.. far have:

mapper.createmap<a, a>()             .formember(dest => dest.collectionprop, opt => opt.mapfrom(e => e.collectionprop)); 

which appears use collectionprop newly created object, not filling elements.

what missing?

thanks

this 1 worked me

            mapper.createmap<a, a>()             .convertusing((s) => {                 var d = new a();                  d.collectionprop.addrange(s.collectionprop);                  return d;             }); 

ok. 1 clones bs

            mapper.createmap<b,b>();              mapper.createmap<a, a>()             .convertusing(s => {                 var d = new a();                 s.collectionprop.tolist()                     .foreach(b => d.collectionprop.add(mapper.map<b,b>(b)));                 return d;             });