AutoMapper忽略扩展方法

Question

I have 2 models:

User.cs:

• Firstname
• Lastname
• Email
• Password

Authentication.cs

• Email
• Password

I would like the Email and Password from the Authentication model to map to the Email and Password within the User model so in my MappingProfile I have:

public UserProfile()
    {
        CreateMap<User, Authentication>()
            .ForMember(dest => dest.Email, o => o.MapFrom(src => src.Email))
            .ForMember(dest => dest.Password, o => o.MapFrom(src => src.Password))
            .IgnoreAllNonExisting();
    }

The IgnoreAllNonExisting is a custom extension like so:

   public static IMappingExpression<TSource, TDestination> IgnoreAllNonExisting<TSource, TDestination>
        (this IMappingExpression<TSource, TDestination> expression)
    {
        var flags = BindingFlags.Public | BindingFlags.Instance;
        var sourceType = typeof(TSource);
        var destinationProperties = typeof(TDestination).GetProperties(flags);

        foreach (var property in destinationProperties)
        {
            if (sourceType.GetProperty(property.Name, flags) == null)
            {
                expression.ForMember(property.Name, opt => opt.Ignore());
            }
        }
        return expression;
    }

Despite the extension I still get this error:

Unmapped properties:Firstname;Lastname

It's almost as if my extension is just being ignored?

Does anyone know what im doing wrong?

Answer 1

Need to create the mappings from User to Authentication and vice-versa (not one mapping for both directions).

Since the names of properties are the same for User and Authentication the AutoMapper makes the automatic mapping.

The extension method IgnoreAllNonExisting is not needed, the AutoMapper makes this work for you.

public static void Test01()
{
    var config = new MapperConfiguration(cfg =>
    {
        cfg.CreateMap<User, Authentication>();
        cfg.CreateMap<Authentication, User>();
    });

    var mapper = config.CreateMapper();

    var authentication = mapper.Map<User, Authentication>(new User { Email = "email", Password = "pass", Firstname = "first", Lastname = "last" });

    var user = mapper.Map<Authentication, User>(new Authentication { Email = "email", Password = "pass" });
}