protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
{
JsonProperty property = base.CreateProperty(member, memberSerialization);
property.ShouldSerialize =
instance =>
{
var entity = instance as ITrackable;
if (entity == null)
{
return(true);
}
EntityNavigationProperty np = entity
.GetNavigationProperties(false)
.FirstOrDefault(x => x.Property == member);
if (np == null)
{
return(true); // not a nav prop
}
if (np.ValueIsNull)
{
return(false); // nav prop is not initialized
}
foreach (var rp in np.AsReferenceProperty())
{
// don't serialize unchanged reference navigation props
return(IncludeReferenceProp(entity, rp.Property));
}
// serialize collection navigation props
return(true);
};
// Inject the custom IValueProvider for entity collections which
// returns only changed items
property.ValueProvider = new CollectionValueProvider(this, member, property.ValueProvider);
return(property);
}
