c# - Create two Automapper maps between the same two object types

Question

I am using AutoMapper in a WCF service to return User objects. User has properties such as AccountTeams which itself has child objects. All of the classes have AutoMapper maps.

Depending on the WCF OperationContract that is called, I want to return different amounts of data. I want one OperationContract to return the User object without its AccountTeams property (and their children) populated and another OperationContract to return the User with the whole chain of properties filled out.

Is there a way to have two different maps between the same two objects or do I need to perform the full mapping and null out the properties I don't want to return from the service?

question from:https://stackoverflow.com/questions/14266108/create-two-automapper-maps-between-the-same-two-object-types

Answer 1

Kevin Kalitowski raised a good point about wal's answer: If we need two configurations to deal with a mapping that needs to be different, then don't we have to duplicate all the other mappings that are common?

I think I've found a way around this using profiles: Have one profile for each of the unique mappings, and a third profile for the common mappings. Then create two configurations, one for each unique profile but also add the common profile to each configuration as well.

Example, in AutoMapper 4.2:

The classes to be mapped: User and Vehicle:

public class User
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class Vehicle
{
    public int FleetNumber { get; set; }
    public string Registration { get; set; }
}

The profiles:

public class Profile1 : Profile
{
    protected override void Configure()
    {
        base.CreateMap<User, User>();
    }
}

public class Profile2 : Profile
{
    protected override void Configure()
    {
        base.CreateMap<User, User>().ForMember(dest => dest.Age, opt => opt.Ignore());
    }
}

public class CommonProfile : Profile
{
    protected override void Configure()
    {
        base.CreateMap<Vehicle, Vehicle>();
    }
}

Then create the configurations and map the objects:

[TestMethod]
public void TestMethod()
{
    var user = new User() { Name = "John", Age = 42 };
    var vehicle = new Vehicle {FleetNumber = 36, Registration = "XYZ123"};

    var configuration1 = new MapperConfiguration(cfg =>
    {
        cfg.AddProfile<CommonProfile>();
        cfg.AddProfile<Profile1>();
    });

    var mapper1 = configuration1.CreateMapper();
    var mappedUser1 = mapper1.Map<User, User>(user);//maps both Name and Age
    var mappedVehicle1 = mapper1.Map<Vehicle, Vehicle>(vehicle);//Maps both FleetNumber 
                                                                //and Registration.

    var configuration2 = new MapperConfiguration(cfg =>
    {
        cfg.AddProfile<CommonProfile>();
        cfg.AddProfile<Profile2>();
    });

    var mapper2 = configuration2.CreateMapper();
    var mappedUser2 = mapper2.Map<User, User>(user);//maps only Name
    var mappedVehicle2 = mapper2.Map<Vehicle, Vehicle>(vehicle);//Same as mappedVehicle1.
}

I tried this out and it works.