AutoMapper only map when target field is null

Question

Is there any option in AutoMappper to only map properties when the target field is null. i.e. only map properties that aren't already set?

I was hoping to do this without having to write an expression for each individual property.

Any help would be appreciated.

Matt

score 2 · Answer 1 · answered Sep 11 '16 at 10:11

2

Please try the following solution:

Mapper.CreateMap<TypeA, TypeB>().ForAllMembers(r=>r.Condition(v=>v.DestinationValue==null));

Hope it helps

answered Sep 11 '16 at 10:11

PinHead877

This was close, the actual mapping was something like this: `cfg.CreateMap() .ForAllMembers(r => r.Condition((source, target, sourceField, targetField) => targetField == null));` – Matt Whetton Sep 11 '16 at 10:36

score 1 · Accepted Answer · answered Sep 11 '16 at 11:00

1

PinHead877 answer did point me very close but the actual answer was more like this:

cfg.CreateMap<TypeA, TypeB>() .ForAllMembers(r => r.Condition((source, target, sourceField, targetField) => targetField == null));

answered Sep 11 '16 at 11:00

Matt Whetton

score 0 · Answer 3 · answered Sep 11 '16 at 10:25

0

Conditional mapping will help you to achieve this.

answered Sep 11 '16 at 10:25

S.N

3 Answers3