Automapper: How to map one source to multiple destinations

Question

I have the following sample entities:

public class User { public string Username { get; set; } public string Password { get; set; } pubilc HashSet<UserRole> Roles { get; set; } } public class Role { public string RoleName { get; set; } public HashSet<UserRole> Users { get; set; } } public class UserRole { public int UserId { get; set; } public virtual User User { get; set; } public int RoleId { get; set; } public virtual Role Role { get; set; } }

and the following Dtos:

public class UserModel { public string Username { get; set; } public string Password { get; set; } pubilc HashSet<RoleModel> Roles { get; set; } } public class RoleModel { public string RoleName { get; set; } public HashSet<UserModel> Users { get; set; } }

with the following AutoMapper configuration:

CreateMap<User, UserModel>(); CreateMap<Role, RoleModel>(); CreateMap<UserRole, UserModel>() .ConstructUsing((src, ctx) => ctx.Mapper.Map<UserModel>(src.User)); CreateMap<UserRole, RoleModel>() .ConstructUsing((src, ctx) => ctx.Mapper.Map<RoleModel>(src.Role));

but this configuration causes the iis to stop without any error!

Is this configuration right for mapping one source into multiple destinations?

Github test project

I just installed Automapper 9.0.0 to .NET Framework WinForms project, copied your code, changed the configuration code to use MapperConfiguration, ran it, and configuration was created without errors. Please make a small test project and copy there only the code you feel is relevant and investigate from there. — Dialecticus
– Dialecticus, Commented Oct 7, 2019 at 9:23
@Dialecticus you can use this github project to see what I say, repo — Saleh Bagheri
– Saleh Bagheri, Commented Oct 7, 2019 at 10:01

Baratali Qadamalizada · Accepted Answer · 2019-10-08 08:43:19Z

I'm not sure if this is good approach to use such a mapping or not. But the problem is for an infinite loop which occurs in the mapping (nested mapping maybe).

Following codes which are commented is the source of loop:

Xueli Chen · Accepted Answer · 2019-10-08 10:46:56Z

You could try to the following mapping :

public MapperConfig() { CreateMap<User, UserModel>(); CreateMap<UserRole, RoleModel>() .ForMember(des=>des.RoleName,opt=>opt.MapFrom(src=>src.Role.RoleName)); CreateMap<Role, RoleModel>(); CreateMap<UserRole, UserModel>() .ForMember(des => des.Username, opt => opt.MapFrom(src => src.User.Username)) .ForMember(des => des.Password, opt => opt.MapFrom(src => src.User.Password)); }

Collectives™ on Stack Overflow

Automapper: How to map one source to multiple destinations

2 Answers 2

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Related