AutoMapper’s ForMember

Calling AutoMapper’s ForMember has been bugging me lately with having to deal with its member configuration options like so:

Mapper.CreateMap<Contact, AddressBookDetailsModel>()
  .ForMember( d => d.PhoneNumbers, o => o.MapFrom( s => s.Phones ) );

The member configuration options provides much more than just MapFrom but 99 times out of 100 I’m only dealing with MapFrom. What I’d really like is something like this:

Mapper.CreateMap<Contact, AddressBookDetailsModel>()
  .ForMember( d => d.PhoneNumbers).MapFrom( s=> s.Phones );       

In looking around I did find http://trycatchfail.com/blog/post/A-More-Fluent-API-For-AutoMapper.aspx. It looked promising but (a) the code was incomplete and (b) it broke down for more complex mappings.

I’d like the syntax above but for now I went with something quicker to implement that gave me a shorter syntax though it might not be as syntactically sweet:

public static class AutoMapperExtensions
{
  public static IMappingExpression<TSource, TDestination> MapItem<TSource, TDestination, TMember>(
    this IMappingExpression<TSource, TDestination> target,
    Expression<Func<TDestination, object>> destinationMember,
    Expression<Func<TSource, TMember>> sourceMember )
  {
    return target.ForMember( destinationMember, opt => opt.MapFrom( sourceMember ) );
  }
}

Now when creating maps I don’t need to fuss with an extra lambda and method call:

     
Mapper.CreateMap<Contact, AddressBookDetailsModel>()
  .MapItem( d => d.PhoneNumbers, s=> s.Phones );        

I can do something similar to simplify Ignore calls:

  
public static class AutoMapperExtensions
{
  public static IMappingExpression<TSource, TDestination> Ignore<TSource, TDestination>(
    this IMappingExpression<TSource, TDestination> target,
    Expression<Func<TDestination, object>> destinationMember)
  {
    return target.ForMember( destinationMember, opt => opt.Ignore() );
  }
  
  /* other code removed for brevity */
}