AutoMapper convert from multiple sources

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You cannot directly map many sources to single destination – you should apply maps one by one, as described in Andrew Whitaker answer. So, you have to define all mappings:

Mapper.CreateMap<People, PeoplePhoneDto>();
Mapper.CreateMap<Phone, PeoplePhoneDto>()
        .ForMember(d => d.PhoneNumber, a => a.MapFrom(s => s.Number));

Then create destination object by any of these mappings, and apply other mappings to created object. And this step can be simplified with very simple extension method:

public static TDestination Map<TSource, TDestination>(
    this TDestination destination, TSource source)
{
    return Mapper.Map(source, destination);
}

Usage is very simple:

var dto = Mapper.Map<PeoplePhoneDto>(people)
                .Map(phone);

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