Automapper unflatten by prefix - automapper

Question

I have an example like this :
class Fields
{
string ContactOneName{get;set;}
string ContactOnePhone{get;set;}
string ContactOneSpouseName{get;set;}
string ContactOneSpousePhone{get;set;}
}
And I would like to map to a model like this:
class Contacts
{
Contact ContactOne {get;set;}
Contact ContactOneSpouse {get;set;}
}
class Contact
{
string Name {get;set;}
string Phone {get;set;}
}
There are lots of fields and I don't want to write a mapping for each field.
Is this possible?
If so how?
NB: This question is almost a duplicate of AutoMapper unflattening complex objects of same type but I want a solution NOT manually mapping everything, because in that case it is not worth using automapper.

Answer 1

You can take this and add:
public static IMappingExpression<TSource, TDestination> ForAllMembers<TSource, TDestination, TMember>(
this IMappingExpression<TSource, TDestination> mapping,
Action<IMemberConfigurationExpression<TSource, TDestination, TMember>> opt)
{
var memberType = typeof(TMember);
var destinationType = typeof(TDestination);
foreach(var prop in destinationType.GetProperties().Where(prop => prop.PropertyType.Equals(memberType)))
{
var parameter = Expression.Parameter(destinationType);
var destinationMember = Expression.Lambda<Func<TDestination, TMember>>(Expression.Property(parameter, prop), parameter);
mapping.ForMember(destinationMember, opt);
}
return mapping;
}
Then you can configure the mapping as follows:
var config = new MapperConfiguration(cfg =>
{
cfg.CreateMap<Fields, Contacts>().ForAllMembers<Fields, Contacts, Contact>(x => { x.Unflatten(); });
});