Automapper - Does it map lists of objects?

Question

I have the following Automapper defintion:

Mapper.CreateMap<IB.BusinessComponents.Data.LocationMaster, IB.Entites.Master.Location>();
Mapper.CreateMap<IB.BusinessComponents.Data.LocationMaster, IB.Entites.Master.Location>()
    .ForMember(destination => destination.Id, source => source.MapFrom(item => item.LocationMasterID))
    .ForMember(destination => destination.ChildLocationList, source => source.Ignore());

This works fine when I map a single object. But I can't seem to pass in Lists of objects. Do I need a different definition when passing in a list, or is it not possible?

Why do you have the same mapping twice? You should only define it once (presumably the second one) — BeRecursive
– BeRecursive, Commented Nov 25, 2010 at 13:43
@BeRecursive - Probably because I have a grand total of 2 hours experience with this tool. — Randy Minder
– Randy Minder, Commented Nov 25, 2010 at 14:46
Well i should work with lists out of the box as long as you define the mapping correctly. Do you mean lists of the above type? You don't need to define mappings for lists of explicit objects, just define the mappings for the type of object you want to map and lists should 'just work' — BeRecursive
– BeRecursive, Commented Nov 25, 2010 at 19:26

ozczecho · Accepted Answer · 2010-11-26 13:17:21Z

159

In your AutoMapper Definition:

    CreateMap<MyStuffDTO, MyStuffViewModel>()
        .ForMember(dto => dto.MyDate, opt => opt.MapFrom(src => src.LastDate))
        .ForMember(dto => dto.MyTime, opt => opt.MapFrom(src => src.LastTime))
        .ForMember(dto => dto.Category, opt => opt.MapFrom(src => src.Category));

In code:

For Single:

var result = Mapper.Map<MyStuffDTO, MyStuffViewModel>(obj);

For List:

var list = Mapper.Map<IList<MyStuffDTO>, IList<MyStuffViewModel>>(obj);

answered Nov 26, 2010 at 13:17

ozczecho

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2 Comments

dnxit Over a year ago

[AutoMap(typeof(List<Category>), typeof(List<CategoryViewModel>))] can I use it like this in MVC ???

Defkon1 Over a year ago

this is outdated, Mapper is no more a static class. Check this stackoverflow.com/questions/58807216/… for an updated solution

Valentin Riabinchak · Accepted Answer · 2024-06-29 18:50:45Z

0

Sometimes you can have exceptions not connected to Automepper. You need to check these main features for correct mappings:

Empty constructor for models
Similar types of lists
Create mappings for all included Properties but MAP only one time.

answered Jun 29, 2024 at 18:50

Valentin Riabinchak

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1 Comment

Zhigalin Over a year ago

This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review

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