I have 3 entity: Obj1
, Obj2
, Obj3
How to map 3 entity to one with automapper?
This post describes how to map multiple objects into a single new object, using the following helper class:
public static class EntityMapper
{
public static T Map<T>(params object[] sources) where T : class
{
if (!sources.Any())
{
return default(T);
}
var initialSource = sources[0];
var mappingResult = Map<T>(initialSource);
// Now map the remaining source objects
if (sources.Count() > 1)
{
Map(mappingResult, sources.Skip(1).ToArray());
}
return mappingResult;
}
private static void Map(object destination, params object[] sources)
{
if (!sources.Any())
{
return;
}
var destinationType = destination.GetType();
foreach (var source in sources)
{
var sourceType = source.GetType();
Mapper.Map(source, destination, sourceType, destinationType);
}
}
private static T Map<T>(object source) where T : class
{
var destinationType = typeof(T)
var sourceType = source.GetType();
var mappingResult = Mapper.Map(source, sourceType, destinationType);
return mappingResult as T;
}
}
Simple usage:
var personViewModel = EntityMapper.Map<PersonViewModel>(person, address, comment);
Let's suppose that it is needed to map them to Obj0
. Basically you need to map them one by one.
Mapper.Map(Obj1, Obj0);
Mapper.Map(Obj2, Obj0);
Mapper.Map(Obj3, Obj0);
In more advanced scenarios you can compose you types into some CompositeObj
and create mapping between Obj0
and CompositeObj
.
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