DomainModelEntityManager.SaveChanges(IEnumberable entities) doesn't save properly

The overload of SaveChanges() that takes an IEnumerable works fine with deleted Entities. On the other hand, DevForce automatically removes entities from BindableLists when those entities get deleted. So probably what's happening is that you're passing SaveChanges() a list that already has the deleted entities removed.

So, you need to pass it a list that includes the deleted entities. You can use EntityManager.FindEntities<T>(EntityState.Deleted) to get a list of references to deleted entities of type T; e.g.,

    List<Customer> deletedCustomers = EntityManager.FindEntities<Customer>(EntityState.Deleted) .ToList();

then add those entities to the list you pass to SaveChanges().

Originally posted by monkeyking Thanks GregD, it works :-) how can I determine if the 'ToList()' method appear after the query?

In this case, I used ToList() because I wanted the results in a List<Customer>, FindEntities<Customer>() returns an IEnumerable<Customer>, and the compiler can't implicitly convert the latter to the former.

But often a call to ToList() is made primarily to force immediate execution of the query, when you need the results in the cache immediately.  See this blog on LINQ and deferred execution:

     http://blogs.msdn.com/charlie/archive/2007/12/09/deferred-execution.aspx