AutoMapper：使用包含的类创建一个地图

Question

I have these two view models:

public class SettingsViewModel
{
    public string UserId { get; set; }
    public PersonalViewModel Personal { get; set; }
}

public class PersonalViewModel
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

After implementing these view models I created a map with automapper:

    Mapper.CreateMap<User, PersonalViewModel>()
        .ForMember(vm => vm.Birthday, m => m.MapFrom(
            u => (u.Birthday.HasValue) ? u.Birthday.Value.ToString("dd.MM.yyyy") : DateTime.Now.ToString("dd.MM.yyyy")));

    Mapper.CreateMap<User, SettingsViewModel>()
        .ForMember(vm => vm.UserId, m => m.MapFrom(
            u => u.Id));

    var viewModel = Mapper.Map<User, SettingsViewModel>(user);

Now I have the problem, that my property Personal in my SettingsViewModel is null. How can I combine my two mappings? How can I fill my Personal property with the data from my user object? In my user object, there are properties for FirstName und LastName .

Answer 1

You could set up your mapping this way:

Mapper.CreateMap<User, SettingsViewModel>()
    .ForMember(vm => vm.UserId, m => m.MapFrom(u => u.Id))
    .ForMember(vm => vm.Personal, opt => opt.MapFrom(u => u));

Here, we're saying map the Personal property from the User object itself. When you specify this, the mapping from User → PersonalViewModel will automatically be used.

Example: https://dotnetfiddle.net/YJnPDq