public void TestAssociations_GraphDelete()
{
NorthwindEntityContainer entities = new NorthwindEntityContainer();
#region Create a test graph
Customer cust = new Customer
{
CustomerID = "ALFKI"
};
Order order = new Order
{
OrderID = 1
};
order.Customer = cust;
order.Order_Details.Add(new Order_Detail
{
ProductID = 1
});
order.Order_Details.Add(new Order_Detail
{
ProductID = 2
});
order.Order_Details.Add(new Order_Detail
{
ProductID = 3
});
entities.LoadEntities(new Entity[] { cust, order });
entities.LoadEntities(order.Order_Details);
((IRevertibleChangeTracking)entities).AcceptChanges();
#endregion
// now delete the graph
// TODO : currently this has to be done in this specific order
// with association modifications being done while the parent
// is attached (before it is removed from set)
foreach (Order_Detail detail in order.Order_Details)
{
order.Order_Details.Remove(detail);
entities.GetEntitySet<Order_Detail>().Remove(detail);
}
cust.Orders.Remove(order);
entities.GetEntitySet<Order>().Remove(order);
entities.GetEntitySet<Customer>().Remove(cust);
// verify the changeset
EntityChangeSet changeSet = entities.GetChanges();
Assert.AreEqual(5, changeSet.RemovedEntities.Count);
// build the operation list and verify it
List<ChangeSetEntry> operations = ChangeSetBuilder.Build(changeSet);
// verify that the association collections for the Order operation are null
ChangeSetEntry orderOperation = operations.Single(p => p.Entity == order);
ChangeSetEntry custOperation = operations.Single(p => p.Entity == cust);
Assert.IsNull(orderOperation.Associations);
Assert.IsNull(orderOperation.OriginalAssociations);
Assert.IsNotNull(orderOperation.OriginalEntity);
// verify that the association collections for the Customer operation are null
Assert.IsNull(custOperation.OriginalEntity);
Assert.IsNull(custOperation.Associations);
Assert.IsNull(custOperation.OriginalAssociations);
// verify that deleted OrderDetails have null associations as well
ChangeSetEntry detailOperation = operations.First(p => p.Entity.GetType() == typeof(Order_Detail));
Assert.IsNotNull(detailOperation.OriginalEntity);
Assert.IsNull(detailOperation.Associations);
Assert.IsNull(detailOperation.OriginalAssociations);
}
partial void DeleteCustomer(Customer instance);
partial void InsertCustomer(Customer instance);
partial void UpdateCustomer(Customer instance);
private bool FilterCustomer(Customer entity)
{
return (entity.CustomerID == this.CustomerID);
}