Use no global Mapper variable of Automapper in Aft

问题:

Is there a way to get the current mapping context in AutoMapper when using AfterMap?

public class DefaultMappingProfile : Profile
{
    protected override void Configure()
    {
        this.CreateMap<SomeList, List<SpecialItem>>()
            .AfterMap((src, dst) => dst.AddRange(
                 src.elem.Select(Mapper.Map<SpecialItem>)));

I tried to use .ConstructUsing(context => {}) but this gave me not the same results as when using AfterMap (!?). But I don't want to access the global variable Mapper here. Is there a way to get around accessing the global variable here?

回答1:

You could as an alternative use ConvertUsing<TSource, TDestination> such as:

CreateMap<data.BillCycle, domain.BillCycle>().ConvertUsing<BillCycleConverter>();

The class will implement ITypeConverter<TSource, TDestination> and gives you access to the mapper:

public class BillCycleConverter : ITypeConverter<data.BillCycle, domain.BillCycle>
{
    public domain.BillCycle Convert(ResolutionContext context)
    {
        context.Engine.Map<X, Y>...
    }
}

Custom Type Converters