private bool HasDownstreamChanges(ITrackingCollection refChangeTracker, ITrackable trackableRef, ITrackable item,
EntityReferenceProperty refProp, bool hasDownstreamChanges)
{
// Get downstream changes
IEnumerable <ITrackable> refPropItems = refChangeTracker.Cast <ITrackable>();
IEnumerable <ITrackable> refPropChanges = GetChanges(refPropItems);
// Set flag for downstream changes
bool hasLocalDownstreamChanges =
refPropChanges.Any(t => t.TrackingState != TrackingState.Deleted) ||
trackableRef.TrackingState == TrackingState.Added ||
trackableRef.TrackingState == TrackingState.Modified;
// Set ref prop to null if unchanged or deleted
if (!hasLocalDownstreamChanges &&
(trackableRef.TrackingState == TrackingState.Unchanged ||
trackableRef.TrackingState == TrackingState.Deleted))
{
EntityInfo(item).RefNavPropUnchanged.Add(refProp.Property);
return(hasDownstreamChanges);
}
// prevent overwrite of hasDownstreamChanges when return from recursion
hasDownstreamChanges |= hasLocalDownstreamChanges;
return(hasDownstreamChanges);
}
private void DeferOwnerDetection(ModelType type, EntityReferenceProperty property, NavigationProperty oneNavProp)
{
type.AfterInitialize(delegate
{
var parentReference = property.PropertyType.Properties[oneNavProp.Name];
if (parentReference != null && (
(oneNavProp.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.One && oneNavProp.ToEndMember.TypeUsage.Facets.Any(f => f.Name == "Nullable" && !(bool)f.Value)) ||
(oneNavProp.FromEndMember.RelationshipMultiplicity == RelationshipMultiplicity.One && oneNavProp.FromEndMember.TypeUsage.Facets.Any(f => f.Name == "Nullable" && !(bool)f.Value))))
{
((EntityModelType)type).OwnerProperties[property] = parentReference as ModelReferenceProperty;
}
});
}
private void DeferOwnerDetection(ModelType type, EntityReferenceProperty property, NavigationProperty oneNavProp)
{
type.AfterInitialize(delegate
{
var parentReference = property.PropertyType.Properties[oneNavProp.Name];
if (parentReference != null && (
(oneNavProp.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.One && oneNavProp.ToEndMember.TypeUsage.Facets.Any(f => f.Name == "Nullable" && !(bool)f.Value)) ||
(oneNavProp.FromEndMember.RelationshipMultiplicity == RelationshipMultiplicity.One && oneNavProp.FromEndMember.TypeUsage.Facets.Any(f => f.Name == "Nullable" && !(bool)f.Value))))
((EntityModelType) type).OwnerProperties[property] = parentReference as ModelReferenceProperty;
});
}