Using enums as criteria in Automapper CreateMap and Projection

Question

Using AutoMapper v6.1

Without having to hard code that value in lieu of the enum ((int)POStatusOptions.Ordered), how can you accomplish this map with Projection:

CreateMap<WorkOrderDetail, WorkOrderDetailsListViewModel>(MemberList.Destination)
.ForMember(vm => vm.QtyOnPOs, opt => opt.MapFrom(entity =>
    entity.Item.PODetails
        .Where(pod => pod.POHeader.StatusId >= (int)POStatusOptions.Ordered)
        .Sum(pod => pod.QtyOrdered)
        )))

My configuration for automapper is using profiles. So I have

My Config Class:

public static class AutoMapperConfiguration
{
    public static void Configure()
    {
        //see https://github.com/AutoMapper/AutoMapper/wiki/Configuration
        //see https://github.com/AutoMapper/AutoMapper/wiki/Configuration-validation 
        Mapper.Initialize(am =>
        {
            am.AddProfile<AutoMapperViewModelProfile>();
            am.AddProfile<AutoMapperViewModelProfileAdmin>();
        });

        //uncomment this during testing to get a list of all errors in the browser when you run any page in otis
        Mapper.AssertConfigurationIsValid();
    }    
}

Which is called in Application_Start() like: AutoMapperConfiguration.Configure();

My profile class:

public class AutoMapperViewModelProfile : Profile
{
    public AutoMapperViewModelProfile()
    {
        CreateMap<WorkOrderDetail, WorkOrderDetailsListViewModel>(MemberList.Destination)
        .ForMember(vm => vm.QtyOnPOs, opt => opt.MapFrom(entity =>
            entity.Item.PODetails
            .Where(pod => pod.POHeader.StatusId >= (int)POStatusOptions.Ordered)
            .Sum(pod => pod.QtyOrdered)
        )))
}

dbraillon · Accepted Answer · 2017-12-15T20:14:09.530

1

In AutoMapper it's called Parameterization. Please see AutoMapper doc.

In your case it would be:

POStatusOption poStatusOption = POStatusOption.Whatever;
CreateMap<WorkOrderDetail, WorkOrderDetailsListViewModel>(MemberList.Destination)
   .ForMember(
      vm => vm.QtyOnPOs, 
      opt => opt.MapFrom(entity =>
         entity.Item.PODetails
            .Where(pod => pod.POHeader.StatusId >= (int)poStatusOption)
            .Sum(pod => pod.QtyOrdered)
      )
   )

And you need to use it like this:

dbContext.WorkOrderDetails.ProjectTo<WorkOrderDetailsListViewModel>(Config, new { poStatusOption = POStatusOptions.Ordered });

edited Dec 15 '17 at 20:14

answered Dec 15 '17 at 07:08

dbraillon

1,742
2
22
34

Thanks, but I can't get this to work. (See my updated question for more details on my setup/config). When I try what you propose, I get the error `use of unassigned local varialble` for the `poStatusOptions` variable. Which I can understand as you declare the variable in this class, but don't explicitly assign it a value in this class...how would the compiler know you are passing in those values from another class? – crichavin Dec 15 '17 at 20:03
1

Just assign it to any value, I don't think it matter, AutoMapper will replace it – dbraillon Dec 15 '17 at 20:10

Using enums as criteria in Automapper CreateMap and Projection

1 Answers1