private bool GetChangesOnChildCollection(IList trackingItems, bool hasDownstreamChanges, ITrackable item,
EntityCollectionProperty <IList> colProp)
{
// Get changes on child collection
var trackingCollChanges = new HashSet <ITrackable>(
GetChanges(trackingItems.Cast <ITrackable>()),
ObjectReferenceEqualityComparer <ITrackable> .Default);
// Set flag for downstream changes
hasDownstreamChanges |= trackingCollChanges.Any();
// Memorize only changed items of collection
EntityInfo(item).ColNavPropChangedEntities[colProp.Property] = trackingCollChanges;
return(hasDownstreamChanges);
}
private static void ApplyChangesOnCollectionProperties(TrackingState stateFilter, bool includeState,
EntityNavigationProperty navProp, EntityCollectionProperty <IList> colProp,
DbContext context, ITrackable item, ObjectVisitationHelper visitationHelper, TrackingState?state = null)
{
// Apply changes to 1-M and M-M properties filtering by tracking state
var count = colProp.EntityCollection.Count;
for (int i = count - 1; i > -1; i--)
{
var trackableChild = colProp.EntityCollection[i] as ITrackable;
if (trackableChild != null)
{
bool condition = includeState
? trackableChild.TrackingState == stateFilter
: trackableChild.TrackingState != stateFilter;
if (condition)
{
context.ApplyChanges(trackableChild, item, visitationHelper, navProp.Property.Name, state);
}
}
}
}
