internal override void ClearCollectionOrRef(IEntityWrapper wrappedEntity, RelationshipNavigation navigation, bool doCascadeDelete)
{
if (wrappedEntity == null)
{
wrappedEntity = EntityWrapperFactory.NullWrapper;
}
if (null != _wrappedCachedValue.Entity)
{
// Following condition checks if we have already visited this graph node. If its true then
// we should not do fixup because that would cause circular loop
if ((wrappedEntity.Entity == _wrappedCachedValue.Entity) && (navigation.Equals(this.RelationshipNavigation)))
{
Remove(_wrappedCachedValue, /*fixup*/ false, /*deleteEntity*/ false, /*deleteOwner*/ false, /*applyReferentialConstraints*/ false, /*preserveForeignKey*/ false);
}
else
{
Remove(_wrappedCachedValue, /*fixup*/ true, doCascadeDelete, /*deleteOwner*/ false, /*applyReferentialConstraints*/ true, /*preserveForeignKey*/ false);
}
}
else
{
// this entity reference could be replacing a relationship that points to a key entry
// we need to search relationships on the Owner entity to see if this is true, and if so remove the relationship entry
if (WrappedOwner.Entity != null && WrappedOwner.Context != null && !UsingNoTracking)
{
EntityEntry ownerEntry = WrappedOwner.Context.ObjectStateManager.GetEntityEntry(WrappedOwner.Entity);
ownerEntry.DeleteRelationshipsThatReferenceKeys(this.RelationshipSet, this.ToEndMember);
}
}
// If we have an Owner, clear the DetachedEntityKey.
// If we do not have an owner, retain the key so that we can resolve the difference when the entity is attached to a context
if (this.WrappedOwner.Entity != null)
{
// Clear the detachedEntityKey as well. In cases where we have to fix up the detachedEntityKey, we will not always be able to detect
// if we have *only* a Deleted relationship for a given entity/relationship/role, so clearing this here will ensure that
// even if no other relationships are added, the key value will still be correct.
((EntityReference)this).DetachedEntityKey = null;
}
}