Convert Multiple List to Single Master Child object List Using Automapper

Question

I have 2 objects which need to be converted to Dto object using automapper. Those 2 objects are

    public class Parent
    {
        public int ParentID { get; set;}
        public string ParentCode { get; set; }
    }

    public class Child
    {
        public int ChildID { get; set; }
        public int ParentID { get; set;}
        public string ChildCode { get; set; }
    }

And 2 Dto objects

    public class ParentDto
    {
        public int ParentID { get; set; }
        public string ParentCode { get; set; }
        public List<ChildDTO> ListChild { get; set; }
    }

    public class ChildDto
    {
        public int ChildID { get; set; }
        public string ChildCode { get; set; }
    }

Need to convert 2 set of list

List<Parent> ListParent
List<Child> ListChild

To

List<ParentDto> ListParentDto

Pedro Brito · Accepted Answer · 2019-09-19 08:28:04Z

1

Because you have multiple sources, my solution was a method like

    public static List<ParentDto> MapToDto(List<Parent> parents, List<Child> childs)
    {
        List<ParentDto> parentDtos = new List<ParentDto>();
        var config = new MapperConfiguration(cfg => {

            cfg.CreateMap<Parent, ParentDto>().BeforeMap((s, d) =>
            {
                d.ListChild = new List<ChildDto>();
                foreach (var child in childs.Where(c => c.ParentID == s.ParentID))
                {
                    d.ListChild.Add(new ChildDto { ChildCode = child.ChildCode, ChildID = child.ChildID });
                }
            }).ForMember(dest => dest.ParentID, opt => opt.MapFrom(src => src.ParentID)).ForMember(dest => dest.ParentCode, opt => opt.MapFrom(src => src.ParentCode));
        });

        IMapper mapper = config.CreateMapper();

        foreach (var p in parents)
        {
            var source = p;
            var destination = mapper.Map<Parent, ParentDto>(source);
            parentDtos.Add(destination);
        }

        return parentDtos;
    }

edited Sep 19, 2019 at 8:28

answered Sep 18, 2019 at 10:05

Pedro Brito

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4 Comments

Jafrul Sadek Nabil Over a year ago

Don't understand the following code -> foreach (var child in childs.Where(c=>c.ParentID==s.ParentID)) -> what is childs ???

Jafrul Sadek Nabil Over a year ago

It works.. But i have lots of parent child Dto's ... can you help me with a generic method? thanks in advance bro.

Pedro Brito Over a year ago

Great :) Help me marking my answer as useful pls. Do you have more class's with this format is what you are saying? and that you want a generic method that will receive 2 lists like the one i posted and returns a result?

Pedro Brito Over a year ago

One solution is, to do 2 interfaces, IParent and IChild, and in the method the input params will be List<IParent> and List<IChild> with this you can have different class's but because they all implement the same interface that have the base params the method becomes generic.

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