public static void Demo()
{
Console.WriteLine("AutoMapping =====================");
var mapperConfiguration = new MapperConfiguration(cfg => cfg.AddProfile<MyProfile>());
mapperConfiguration.AssertConfigurationIsValid<MyProfile>();
var mapper = mapperConfiguration.CreateMapper();
Trace.Assert(EnumB.V1 == mapper.Map<EnumB>(EnumA.V1));
Trace.Assert(EnumA.V1 == mapper.Map<EnumA>(EnumB.V1));
var deep = new DeepAggregate();
Trace.Assert(deep.Address != null); // largely guaranteed from nullable reference types
deep.Address!.City = "La Paz";
deep.Address.Province = "Bolivia";
deep.FlaggedAt = DateTime.UtcNow;
var flatAuto = mapper.Map<FlatAggregate>(deep);
Trace.Assert(flatAuto.AddressCity == "La Paz");
Trace.Assert(flatAuto.AddressRegion == "Bolivia");
Trace.Assert(flatAuto.IsFlagged);
var deepAuto = mapper.Map<DeepAggregate>(flatAuto);
Trace.Assert(deepAuto.Address.City == deep.Address.City);
Trace.Assert(deepAuto.Address.Province == deep.Address.Province);
Trace.Assert(deepAuto.FlaggedAt == null); //<<<< one way only
var deeps = new EnumerableQuery<DeepAggregate>(new[] {deep, deepAuto});
Trace.Assert(1 == deeps.Count(d => d.FlaggedAt != null));
var projectedFlats = deeps.ProjectTo<FlatAggregate>(mapper.ConfigurationProvider, a => a.IsFlagged);
Trace.Assert(2 == projectedFlats.Count(f => f.AddressRegion == "Bolivia"));
Trace.Assert(0 == projectedFlats.Count(f => f.AddressRegion == "Bolognese"));
Trace.Assert(1 == projectedFlats.Count(f => f.IsFlagged));
Trace.Assert(1 == projectedFlats.Count(f => !f.IsFlagged));
}