Complex Mapping of objects Automapper c#

Question

I have 4 classes

Class 1:

Public class user
{
 Public int Id {get;set;}
 Public string username {get;set;}
 Public ICollection<Project> 
 projects{get;set;}
 Public    
 ICollection<Projectmembers>
 Projectmembers{get;set;}
}

Class 2:

Public class project
{
Public int Id{get;set;}
Public string projectname
{get;set;}
Public int userid {get;set;}
Public ICollection<ProjectReq
{get;set;}
[Foreignkey(nameof(userid))]
Public user userfield{get;set;}
}

Class 3:

Public class ProjectReq
{
Public int Id {get;set;}
Public int projectid {get;set;}
Public string role {get;set;}

[Foreignkey(nameof(projectid))]
Public project proj {get;set;}
Public ICollection<Projectmembers> 
{get;set;}
}

Class 4:

Public class Projectmembers
{
Public int Id {get;set;}
Public int reqid {get;set;}
Public int userid {get;set;}

[Foreignkey(nameof(reqid))]
Public project projectReq 
{get;set;}
[Foreignkey(nameof(userid))]
Public user userfield {get;set;}

}

How can I map project class to the below view model;

 Public class Projectmemberview
 {
 Public string 
 projectname{get;set;}
 Public string username{get;set;}
 Public string role{get;set;}
 }

I have used linq and got result to project entity model please help me with mapping it to the Projectmemberview model

Can you provide the actual code you have tried? How are you keeping the objects managed? (Are they all in lists, or do you have individual objects declared) — Ibrennan208, Jun 08 '22 at 18:43
Perhaps this answers your question: https://stackoverflow.com/questions/6985000/how-to-use-automapper-formember — Ibrennan208, Jun 08 '22 at 20:11

Ibrennan208 · Answer 1 · 2022-06-08T19:07:11.630

Assuming you had lists of each object type (Project, User, ProjectReq), you could iterate over the Project list, and for each one create a ProjectMemberView like so:

            List<Project> projects = new List<Project>();

            List<User> users = new List<User>();

            List<ProjectReq> projectReqs = new List<ProjectReq>();

            // ...


            // ...

            List<ProjectMemberView> projectMemberViews = new List<ProjectMemberView>();
         
            // for each of our projects
            foreach (Project project in projects)
            {
                // add to our project member view list
                projectMemberViews.Add(

                    // a new projectmemberview
                    new ProjectMemberView()
                    {
                        // whose project name is the current project's name
                        ProjectName = project.ProjectName,

                        // the username is the user's whose Id is equal to the current project's user id
                        Username = users.Find(x => x.Id == project.UserId).Username,

                        // the role is the projectreq's role whose project Id is shared with the current project
                        Role = projectReqs.Find(x => x.ProjectId == project.Id).Role
                    });
            }

This code is incomplete because of assumptions made, and may need error handling.

Actually I was looking for solution with Automapper – Vicky Srinivasan Jun 08 '22 at 19:59 — Vicky Srinivasan, Jun 08 '22 at 19:59

Ruikai Feng · Answer 2 · 2022-06-09T05:58:28.797

I tried as below:

public class SomeProfile : Profile
    {
        public SomeProfile()
        {
            CreateMap<Projectmembers, Projectmemberview>().ForMember(x => x.projectname, y => y.MapFrom(s => s.projectReq.projectname)).
                ForMember(x => x.username, y => y.MapFrom(s => s.userfield.username)).
                 
                 ForMember(x => x.role, y => y.Ignore());
        }        
    }

I couldn't understand how you want to map the role property (the source of role property is in ProjectReq Class,and in your project class there's a collection of ProjectReq),So I ignored the property,it may help if you could check your model and explain to me .

in startup:

services.AddAutoMapper(typeof(SomeProfile));

In controller:

    public class SomeController : Controller
        {
            
            private readonly IMapper _mapper;
                 
            public SomeController( IMapper mapper)
            {
               
                _mapper = mapper;
            }
    
            
            public IActionResult SomeAction()
            {
                ......
                var user = new user() { Id = 1, username = "somename" };
                var project = new project() { Id = 1, projectname = "someproj" };
                var projmembers = new Projectmembers() { projectReq = project, userfield = user };
                var projectmemberview = _mapper.Map<Projectmemberview>(projmembers);
                ......
            }
         }

The result:

Complex Mapping of objects Automapper c#

2 Answers2