AutoMapper - Map flatten object to complex object

Question

I have these models:

class Source
{
    String A;
    String B;
    String C;
    String D;
}

class Destination
{
    String A;
    String B;
    Another another;
    Other other;
}

class Other
{
    String C;
    AnotherOne Another;
}

class AnotherOne
{
    String D;
}

I want to map the Source model to Destination and its children. First approach trying using AutoMapper. So is it possible? Or is it better to do this assignment manually?

Possible duplicate: Dotnet AutoMapper Flat schema to complex hierarchy — Oliver
– Oliver, Commented Sep 10, 2022 at 13:30
docs.automapper.org/en/latest/Flattening.html#includemembers — Lucian Bargaoanu
– Lucian Bargaoanu, Commented Sep 10, 2022 at 13:37

Yong Shun · Accepted Answer · 2022-09-11 03:48:28Z

1

Solution 1: With ForPath.

var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<Source, AnotherOne>();
            
    cfg.CreateMap<Source, Other>()
        .ForPath(dest => dest.Another, opt => opt.MapFrom(src => src));
            
    cfg.CreateMap<Source, Destination>()
        .ForPath(dest => dest.other, opt => opt.MapFrom(src => src));
});

Demo Solution 1 @ .NET Fiddle

Solution 2: With IncludeMembers to flatten and ReverseMap to create the reverse map explicitly.

var config = new MapperConfiguration(cfg =>
{           
    cfg.CreateMap<Source, AnotherOne>()
        .ReverseMap();
            
    cfg.CreateMap<Other, Source>()
        .IncludeMembers(src => src.Another)
        .ReverseMap();
            
    cfg.CreateMap<Destination, Source>()
        .IncludeMembers(src => src.other)
        .ReverseMap();
});

Demo Solution 2 @ .NET Fiddle

References

Flattening (IncludeMembers section) - AutoMapper documentation

answered Sep 11, 2022 at 3:48

Yong Shun

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1 Comment

Lucian Bargaoanu Over a year ago

If the reverse map is not actually needed, of course the first solution is preferable :)

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