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public class Talk { public int TalkId { get; set; } public string Title { get; set; } public DateTime CreateDate { get; set; } public DateTime RevisedDate { get; set; } public IList<Speaker> Speakers { get; set; } } public class EFRecipesEntities : ObjectContext { public EFRecipesEntities() : base("name=EFRecipesEntities", "EFRecipesEntities") { this.SavingChanges += new EventHandler(EFRecipesEntities_SavingChanges); } private ObjectSet<Speaker> speakers; private ObjectSet<Talk> talks; public ObjectSet<Speaker> Speakers { get { return speakers (speakers = CreateObjectSet<Speaker>()); } } public ObjectSet<Talk> Talks { get { return talks (talks = CreateObjectSet<Talk>()); } } private void EFRecipesEntities_SavingChanges(object sender, EventArgs e) { var addedTalks = this.ObjectStateManager .GetObjectStateEntries( System.Data.EntityState.Added) .Where(en => en.Entity is Talk) .Select(en => en.Entity as Talk); foreach (var talk in addedTalks) { talk.CreateDate = DateTime.Now; talk.RevisedDate = DateTime.Now; } var revisedTalks = this.ObjectStateManager .GetObjectStateEntries( System.Data.EntityState.Modified) .Where(en => en.Entity is Talk) .Select(en => en.Entity as Talk); foreach (var talk in revisedTalks) { talk.RevisedDate = DateTime.Now;
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} } public override int SaveChanges(SaveOptions options) { this.DetectChanges(); return base.SaveChanges(options); } } The following is the output of the code in Listing 8-10: talk1.Speaker is null: True talk1.Speaker is null: False Number of added entries tracked: 3 talk1's state is: Unchanged talk1's state is: Modified Speaker: Karen Stanfield Talk Title: AI with C# in 3 Easy Steps
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The code in Listing 8-10 is a little involved, so let s take it one step at a time. First off, we create a speaker and a talk. Then we add the talk to the speaker s collection. At this point, the talk is part of the speaker s collection, but the speaker is not part of the talk s collection. The other side of the association has not been fixed up yet. Next, we add the speaker to the object context with AddObject(speaker1). The second line of the output shows now that the talk s speaker collection is correct. Entity Framework has fixed up the other side of the association. Here Entity Framework did two things. It notified the object state manager that there are three entries to be created (third line of the output). One of these entries is for the speaker, one is for the talk, and one is for the many-to-many association entry. The second thing Entity Framework did was to fix up the talk s speaker collection. When we call SaveChanges(),Entity Framework raises the SavingChanges event. Inside the handler for this event we update the CreateDate and RevisedDate properties. After the SavingChanges event is handled, Entity Framework calls DetectChanges() to find any changes that occurred in the event handler. In Listing 8-10, we override the SaveChanges() method and explicitly call DetectChanges(), although this is not strictly necessary. The DetectChanges() method relies on a snapshot base comparison of the original and current values for each property on each entity. This process determines what has changed in the object graph. For large object graphs, this comparison process may be time consuming.
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8-8. Testing Domain Objects
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You want to create unit tests for the business rules you have defined for your entities.
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Solution
For this solution, we ll use the POCO template to generate the classes for our entities. Using the POCO template will reduce the amount of code we need to write and make the solution a little more clear. Of course, you use the remaining steps in this solution with your hand-crafted POCO classes. Suppose you have a model like the one shown in Figure 8-9.
Figure 8-9. A model of reservations, schedules, and trains This model represents reservations for train travel. Each reservation is for a particular scheduled train departure. To create the model and prepare the application for unit testing, do the following: 1. Create an empty solution. Right-click the solution in the Solution Explorer and select Add New Project. Add a new Class Library project. Name this new project TrainReservation. Right-click the TrainReservation project and select Add New Item. Add a new ADO.NET Entity Data Model. Import the Train, Schedule, and Reservation tables. The resulting model should look like the one in Figure 8-9. Right-click the design surface and select Add Code Generation Item. Select ADO.NET POCO Entity Generator. Name this item Recipe8.tt. Click Add. The T4 template for POCO code generation will be added to your project. This will cause POCO classes to be generated for your entities. If the POCO template is not available, use the Tools Extension Manager to download the template or enable it if you have already installed it. Add the IValidate interface and ChangeAction enum in Listing 8-11 to the project.
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