Automapping dynamic objects ignoring case of property names - automapper

Question

How do I configure the mapper so that this works?
(i.e. the properties from the dynamic object should map to the properties of the class definition with the same letters - ignoring case)
public class Foo {
public int Bar { get; set; }
public int Baz { get; set; }
}
dynamic fooDyn = new MyDynamicObject();
fooDyn.baR = 5;
fooDyn.bAz = 6;
Mapper.Initialize(cfg => {});
Foo result = Mapper.Map<Foo>(fooDyn);
result.Bar.ShouldEqual(5);
result.Baz.ShouldEqual(6);

Answer 1

If your dynamic object implements IDictionary<string,object> (e.g. ExpandoObject) then the following should work. There must be some easier way to do this as anonymous objects are mapped just fine even if the case is different.
Mapper.Initialize(cfg =>
{
cfg.CreateMap<IDictionary<string, object>, Foo>()
.ConstructUsing(d =>
{
Foo foo = new Foo();
foreach (System.Reflection.PropertyInfo prop in typeof(Foo).GetProperties())
{
foreach (KeyValuePair<string, object> entry in d)
{
if (entry.Key.ToLowerInvariant() == prop.Name.ToLowerInvariant())
{
prop.SetValue(foo, entry.Value);
break;
}
}
}
return foo;
});
});

Answer 2

AutoMapper allows you to configure explicit member mapping on the map configuration in this style:
var config = new MapperConfiguration(cfg =>
{
var dynamicMap = cfg.CreateMap<IDictionary<string, object>, SomethingDTO>();
dynamicMap.ForAllMembers((expression) => expression.MapFrom(source =>
source.ContainsKey(expression.DestinationMember.Name.Substring(0, 1).ToLower()
+ expression.DestinationMember.Name.Substring(1))
? source[expression.DestinationMember.Name.Substring(0, 1).ToLower()
+ expression.DestinationMember.Name.Substring(1)] : null
));
});
For mapping a dynamic/expando object that is camel case to an type with pascal case members you could use ForAllMembers on the the explicit map configuration. Possible use case: json payloads to DTO.
In comparison to the other answer (which also works) this approach allows you to continue to benefit and use all the other map features and configuration.