public static void DynamicMapFrom <TSource, TDestination, TMember>(this IMemberConfigurationExpression <TSource, TDestination, TMember> xExpression, Type xSelectedPropertyType, LambdaExpression xMapExpression)
{
MethodInfo method = xExpression.GetType().GetMethods().Where(m => m.Name == "MapFrom").FirstOrDefault(f => f.GetParameters().Any(a => a.Name.Equals("mapExpression")));
MethodInfo generic = method.MakeGenericMethod(xSelectedPropertyType);
generic.Invoke(xExpression, new object[] { xMapExpression });
}