Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

AutoMapper: What is the difference between ForMember() and ForPath()?

I am reading AutoMapper's ReverseMap() and I can not understand the difference between ForMember() and ForPath(). Implementations was described here. In my experience I achieved with ForMember().

See the following code where I have configured reverse mapping:

public class Customer
{
    public string Surname { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
}
public class CustomerDto
{
    public string CustomerName { get; set; }
    public int Age { get; set; }
}

static void Main(string[] args)
{
    Mapper.Initialize(cfg =>
    {
        cfg.CreateMap<Customer, CustomerDto>()
           .ForMember(dist => dist.CustomerName, opt => opt.MapFrom(src => $"{src.Surname} {src.Name}"))
            .ReverseMap()
            .ForMember(dist => dist.Surname, opt => opt.MapFrom(src => src.CustomerName.Split(' ')[0]))
            .ForMember(dist => dist.Name, opt => opt.MapFrom(src => src.CustomerName.Split(' ')[1]));
    });

    // mapping Customer -> CustomerDto            
    //... 
    //

    // mapping CustomerDto -> Customer
    var customerDto = new CustomerDto
    {
        CustomerName = "Shakhabov Adam",
        Age = 31
    };
    var newCustomer = Mapper.Map<CustomerDto, Customer>(customerDto);
}

It is working.


Question

Do ForMember and ForPath the same things or when should I use ForPath() over ForMember()?

like image 648
Adam Shakhabov Avatar asked Aug 05 '17 17:08

Adam Shakhabov


People also ask

Does Automapper work both ways?

We can map both directions, including unflattening: var configuration = new MapperConfiguration(cfg => { cfg. CreateMap<Order, OrderDto>() . ReverseMap(); });

What is Automapper profile?

automapper Profiles Basic Profile Profiles permit the programmer to organize maps into classes, enhancing code readability and maintainability. Any number of profiles can be created, and added to one or more configurations as needed. Profiles can be used with both the static and instance-based APIs.


Video Answer


1 Answers

In this case, to avoid inconsistencies, ForPath is translated internally to ForMember. Although what @IvanStoev says makes sense, another way to look at it is that ForPath is a subset of ForMember. Because you can do more things in ForMember. So when you have a member, use ForMember and when you have a path, use ForPath :)

like image 132
Lucian Bargaoanu Avatar answered Oct 18 '22 22:10

Lucian Bargaoanu