/// <summary>
/// Compares this instance to a given Navigation by their values.
/// </summary>
public override bool Equals(object obj)
{
RelationshipNavigation compareTo = obj as RelationshipNavigation;
return((this == compareTo) ||
((null != this) && (null != compareTo) &&
(this.RelationshipName == compareTo.RelationshipName) &&
(this.From == compareTo.From) &&
(this.To == compareTo.To)));
}
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;
}
}
internal override void ClearCollectionOrRef(IEntityWrapper wrappedEntity, RelationshipNavigation navigation, bool doCascadeDelete)
{
if (null != _wrappedRelatedEntities)
{
//copy into list because changing collection member is not allowed during enumeration.
// If possible avoid copying into list.
List <IEntityWrapper> tempCopy = new List <IEntityWrapper>(_wrappedRelatedEntities.Values);
foreach (IEntityWrapper wrappedCurrent in tempCopy)
{
// 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 == wrappedCurrent.Entity) && (navigation.Equals(RelationshipNavigation)))
{
Remove(wrappedCurrent, /*fixup*/ false, /*deleteEntity*/ false, /*deleteOwner*/ false, /*applyReferentialConstraints*/ false, /*preserveForeignKey*/ false);
}
else
{
Remove(wrappedCurrent, /*fixup*/ true, doCascadeDelete, /*deleteOwner*/ false, /*applyReferentialConstraints*/ false, /*preserveForeignKey*/ false);
}
}
Debug.Assert(_wrappedRelatedEntities.Count == 0, "After removing all related entities local collection count should be zero");
}
}
internal EntityReference(IEntityWrapper wrappedOwner, RelationshipNavigation navigation, IRelationshipFixer relationshipFixer)
: base(wrappedOwner, navigation, relationshipFixer)
{
_wrappedCachedValue = EntityWrapperFactory.NullWrapper;
}
internal EntityReference(IEntityWrapper wrappedOwner, RelationshipNavigation navigation, IRelationshipFixer relationshipFixer)
: base(wrappedOwner, navigation, relationshipFixer)
{
}
internal EntityCollection(IEntityWrapper wrappedOwner, RelationshipNavigation navigation, IRelationshipFixer relationshipFixer)
: base(wrappedOwner, navigation, relationshipFixer)
{
}
internal EntityReference(IEntityWrapper wrappedOwner, RelationshipNavigation navigation, IRelationshipFixer relationshipFixer)
: base(wrappedOwner, navigation, relationshipFixer)
{
}
/// <summary>
/// Used during relationship fixup when the source end of the relationship is not
/// yet in the relationships list, and needs to be created
/// </summary>
/// <param name="navigation">RelationshipNavigation to be set on new RelatedEnd</param>
/// <param name="relationshipManager">RelationshipManager to use for creating the new end</param>
/// <returns>Reference to the new collection or reference on the other end of the relationship</returns>
RelatedEnd IRelationshipFixer.CreateSourceEnd(RelationshipNavigation navigation, RelationshipManager relationshipManager)
{
return(relationshipManager.CreateRelatedEnd <TTargetEntity, TSourceEntity>(navigation, _targetRoleMultiplicity, _sourceRoleMultiplicity, /*existingRelatedEnd*/ null));
}
