So based on Bruno’s answer here and John Skeet’s post about singletons I came up with the following solution to have this run only once and be completely isolated in class library unlike the accepted answer which relies on the consumer of the library to configure the mappings in the parent project: public static class … Read more
This is because you are trying to map to the actual destination type rather than a property of the destination type. You can achieve what you want with: Mapper.CreateMap<Tag, string>().ConvertUsing(source => source.Name ?? string.Empty); although it would be a lot simpler just to override ToString on the Tag class.
In the past I had a long email exchange on the mailing list with the author of Automapper. MapFrom will do null checks all the way trough the expression: So you can do opt => opt.MapFrom(src => src.SomeProp.Way.Down.Here.Somewhere) and each level will get checked for nulls (as it already does for flattening).
Try this Mapper.CreateMap<Source, Target>() .ForMember(dest => dest.Value, opt => opt.MapFrom (src => src.Value1.StartsWith(“A”) ? src.Value1 : src.Value2)); Condition option is used to add conditions to properties that must be met before that property will be mapped and MapFrom option is used to perform custom source/destination member mappings.
Once you’ve created the map (which you’ve already done, you don’t need to repeat for Lists), it’s as easy as: List<PersonView> personViews = Mapper.Map<List<Person>, List<PersonView>>(people); You can read more in the AutoMapper documentation for Lists and Arrays.
Mapper.CreateMap<Source, Destination>() .ForMember(dest => dest.Member, opt => opt.UseValue<string>(“THIS STRING”)); Starting with version 8.0 you have to use the following: Mapper.CreateMap<Source, Destination>() .ForMember(dest => dest.Member, opt => opt.MapFrom(src => “THIS STRING”));