Automapper - Multi object source and one destination

Question

I am using auto mapper to map multiple objects (db class into ui objects).

Map 1:

Mapper.CreateMap<sourceone, destination>().ForMember(sss => sss.one, m => m.MapFrom(source => source.abc)); 

Map 2:

Mapper.CreateMap<sourcetwo, destination>().ForMember(sss => sss.two, m => m.MapFrom(source => source.xyz));  destination d = new destination(); 

//Map 1

d = AutoMapper.Mapper.Map<sourceone, destination>(sourceone); 

//Map 2

d = AutoMapper.Mapper.Map<sourcetwo, destination>(sourcetwo); 

Once I make call to the 'Map 2', the values that are populated using Map 1 are lost.. (i.e destination.one is becoming empty). How do I fix this?

Answer 1

Map has an overload that takes a source and destination object:

d = AutoMapper.Mapper.Map<sourceone, destination>(sourceone);  /* Pass the created destination to the second map call: */ AutoMapper.Mapper.Map<sourcetwo, destination>(sourcetwo, d); 

Answer 2

mapper.MergeInto<PersonCar>(person, car) 

with the accepted answer as extension-methods, simple and general version:

public static TResult MergeInto<TResult>(this IMapper mapper, object item1, object item2) {     return mapper.Map(item2, mapper.Map<TResult>(item1)); }  public static TResult MergeInto<TResult>(this IMapper mapper, params object[] objects) {     var res = mapper.Map<TResult>(objects.First());     return objects.Skip(1).Aggregate(res, (r, obj) => mapper.Map(obj, r)); } 

after configuring mapping for each input-type:

IMapper mapper = new MapperConfiguration(cfg => {     cfg.CreateMap<Person, PersonCar>();     cfg.CreateMap<Car, PersonCar>(); }).CreateMapper();