private void ClearForeignKeyReferences(TrackedObject to)
{
foreach (MetaAssociation association in to.Type.Associations)
{
if ((association.IsForeignKey && (association.OtherMember != null)) && association.OtherMember.IsAssociation)
{
object[] foreignKeyValues = CommonDataServices.GetForeignKeyValues(association, to.Current);
object instance = this.services.IdentityManager.Find(association.OtherType, foreignKeyValues);
if (instance != null)
{
if (association.OtherMember.Association.IsMany)
{
IList boxedValue = association.OtherMember.MemberAccessor.GetBoxedValue(instance) as IList;
if ((boxedValue != null) && !boxedValue.IsFixedSize)
{
boxedValue.Remove(to.Current);
}
}
else
{
association.OtherMember.MemberAccessor.SetBoxedValue(ref instance, null);
}
}
}
}
}
private bool HasAssociationChanged(MetaAssociation assoc, TrackedObject item)
{
if ((item.Original != null) && (item.Current != null))
{
if (assoc.ThisMember.StorageAccessor.HasAssignedValue(item.Current) || assoc.ThisMember.StorageAccessor.HasLoadedValue(item.Current))
{
return(this.GetOtherItem(assoc, item.Current) != this.GetOtherItem(assoc, item.Original));
}
object[] foreignKeyValues = CommonDataServices.GetForeignKeyValues(assoc, item.Current);
object[] objArray2 = CommonDataServices.GetForeignKeyValues(assoc, item.Original);
int index = 0;
int length = foreignKeyValues.Length;
while (index < length)
{
if (!object.Equals(foreignKeyValues[index], objArray2[index]))
{
return(true);
}
index++;
}
}
return(false);
}
private TrackedObject GetOtherItem(MetaAssociation assoc, object instance)
{
object boxedValue;
if (instance == null)
{
return(null);
}
if (assoc.ThisMember.StorageAccessor.HasAssignedValue(instance) || assoc.ThisMember.StorageAccessor.HasLoadedValue(instance))
{
boxedValue = assoc.ThisMember.MemberAccessor.GetBoxedValue(instance);
}
else
{
object[] foreignKeyValues = CommonDataServices.GetForeignKeyValues(assoc, instance);
boxedValue = this.services.GetCachedObject(assoc.OtherType, foreignKeyValues);
}
if (boxedValue == null)
{
return(null);
}
return(this.tracker.GetTrackedObject(boxedValue));
}