Automapper - Map list of string to list of object with string property

Question

I have problem with automapper

Here I have two objects:

Object 1:

public class First
{
    ......

    public IList<string> ImportantList{ get; set; }

    ......
}

Object 2:

public class Second
{
    .....

    public IList<ImportantListClass> ImportantList{ get; set; }

    .....
}

class:

public class ImportantListClass
{
    public string Name{ get; set; }
}

I try to use automapper to map First object to Second but my destination ImportantList is Empty. I have the same number of object in destination class but Name property is null.

I try:

CreateMap<Second, First>()
            .ForMember(z => z.ImportantList, map => map.MapFrom(z => 
             z.ImportantList.Select(x => x.Name).ToList()))
            .ReverseMap();

But it not change anything Is their any better way to do this

@EDIT

I ADD this:

        CreateMap<First, Second>();
        CreateMap<ImportantListClass, string>()
            .ConvertUsing(source => source.Name);
        CreateMap<string, ImportantListClass>()
                .ForMember(z => z.Name, z=> z.MapFrom(d => d));

Thanks for help!

docs.automapper.org/en/latest/Configuration-validation.html

Lucian Bargaoanu
– Lucian Bargaoanu

2021-05-11 07:38:43 +00:00
Commented May 11, 2021 at 7:38 — Lucian Bargaoanu
– Lucian Bargaoanu, Commented May 11, 2021 at 7:38

Tomas Chabada · Accepted Answer · 2021-05-11 07:39:59Z

2

You need to use ConvertUsing and add a map from ImportantListClass to string:

var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<Second, First>();
    cfg.CreateMap<ImportantListClass, string>()
    .ConvertUsing(source => source.Name);
});

var mapper = config.CreateMapper();

var second = new Second
{
    Id = 22,
    ImportantList = new List<ImportantListClass>
    {
        new ImportantListClass { Name = "Name1" },
        new ImportantListClass { Name = "Name2" }
    }
};

var first = mapper.Map<First>(second);

edited May 11, 2021 at 7:39

answered May 11, 2021 at 7:38

Tomas Chabada

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2 Comments

Lucian Bargaoanu Over a year ago

d should be source :)

Tomas Chabada Over a year ago

@LucianBargaoanu no problem, I modified the parameter name

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