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  • Rickard Liljeberg 23 posts 114 karma points
    Mar 22, 2016 @ 09:11
    Rickard Liljeberg

    Automapper Initialize from dll

    I am making a umbraco application/section in my own project. My project has it's own api controllers and model (for storing in database).

    But sometimes I want to send out a "view model" instead of my db model from my api controllers. And then I want automapper.

    So I did this piece of code to run automapper Initialize once for the dll when it loads.

    [assembly: PreApplicationStartMethod(typeof(UmbracoEventPlanner.Startup), "Start")]
    namespace UmbracoEventPlanner
        public class Startup
            // Automatically will work on startup
            public static void Start()
                Mapper.Initialize(cfg =>
                    cfg.AddProfile(new EventLocationProfile());
        public class EventLocationProfile : Profile
            protected override void Configure()
                Mapper.CreateMap<EventLocation, EventLocationEditModel>()
                    .ForMember(dest => dest.LocationTagIds, opt => opt.Ignore());

    I have debugged the code above and it does run like it should and after the Mapper.CreateMap has run I try this in my debugger.

    Mapper.Map<EventLocation, EventLocationEditModel>(new EventLocation(){Name="my test name"})

    And it works.... But later on when I run the exact same line from my API controller i get that the Mapping does not exist. At this point I can call the Mapper.CreateMap and it works but I don't want to call that from every call to my API controller.

    After googling my best bet is that it's because umbraco runs Mapper.Initialize after I do and then overwrites my mappings.

    So how can i avoid that?

    As a final note, I want my project (own dll) to be independent with it's automapper. I do not want to have to add mappings in my umbraco web project. As I want to be able to package this up and give to people.

  • Tony 105 posts 163 karma points
    Nov 25, 2019 @ 22:12

    Hi, Did you get anywhere with this? Im hitting the same issue with Automapper mappings not running in an API.

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