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POEntity Framework 4.1, Generic Repository and ObservableCollection
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  1. POEntity Framework 4.1, Generic Repository and ObservableCollection
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    copied!<p>I'm implementing the repository pattern with EF 4.1, <a href="http://huyrua.wordpress.com/2011/04/13/entity-framework-4-poco-repository-and-specification-pattern-upgraded-to-ef-4-1" rel="nofollow">http://huyrua.wordpress.com/2011/04/13/entity-framework-4-poco-repository-and-specification-pattern-upgraded-to-ef-4-1</a></p> <p>My proble is that I'm working in a legacy Winform application and in order to databind the returned collection to grid controls and detect new items, I need an ObservableCollection, but all repository method I have seen on varios repository patterns examples only return IList collections.</p> <p>What I do now is:</p> <pre><code>IList&lt;AccountType&gt; accountTypes = _repository.GetAll&lt;AccountType&gt;().ToList(); var a1 = new AccountType { Name = "Bank2" }; var a2 = new AccountType { Name = "Cash2" }; accountTypes.Add(a1); accountTypes.Add(a2); _repository.UnitOfWork.SaveChanges(); Console.Write("AccountType Saved."); </code></pre> <p>but with this code, added items are not persisted by the repository.</p> <p>Have someone any idea how to avoid this and return a BindigList or ObservableCollection from a generic repository using EF 4.1?</p> <p><strong>EDITED:</strong></p> <p>If I convert the IList returned to a ObservableColletion, do you mean somethink like this test code I have wrote is OK?:</p> <pre><code>[TestMethod] public void CreateAccountList() { _accountTypes = new ObservableCollection&lt;AccountType&gt;(_repository.GetAll&lt;AccountType&gt;().ToList()); _accountTypes.CollectionChanged += CollectionChanged; var a1 = new AccountType { Name = "Bank2" }; var a2 = new AccountType { Name = "Cash2" }; _accountTypes.Add(a1); _accountTypes.Add(a2); _accountTypes.Remove(a2); _repository.UnitOfWork.SaveChanges(); int count = _repository.Count&lt;AccountType&gt;(); Assert.AreEqual(1, count); } void CollectionChanged(object sender, NotifyCollectionChangedEventArgs notifyCollectionChangedEventArgs) { switch (notifyCollectionChangedEventArgs.Action) { case NotifyCollectionChangedAction.Add: foreach (var accountType in notifyCollectionChangedEventArgs.NewItems) { _repository.Add((AccountType)accountType); } break; case NotifyCollectionChangedAction.Remove: foreach (var accountType in notifyCollectionChangedEventArgs.OldItems) { _repository.Delete((AccountType)accountType); } break; } } </code></pre> <p>or is there an generic way of doing it?</p>
 

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