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Suppose you have a model like the one in Figure 7-7.

Figure 7-7. Our model with technicians and their service calls In this model, each technician has service calls that include the contact name and issue for the call. You want to create an extension method that retrieves all entities in the model that are in the Added, Modified, or Unchanged state. To do this, follow the pattern in Listing 7-4.

Detailed design is when the team really starts to make the hard decisions about how the system will be implemented. The team may also be creating prototypes to explore various facets of the design and to help produce more realistic time/effort estimates; but, ultimately, they need to gain common consensus on how the system will be put together, with a clear design agreed upon and understood by all the members of the development team. As you can see from the chapter-opening diagram, unit tests have a close symbiotic relationship with the detailed design. A unit test knows about the internals of the method under test, e.g., specific variables and the other objects and methods that the code depends on. A unit test is also very finegrained, being concerned as it is with an individual method and the results of a single call into that method.

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You ve seen how type fidelity is provided between client and server for DataSets, and how you can use schema importer extensions to provide similar behavior for your own types The other facet of the DataSet that makes this possible is the format it uses to represent itself within XML The DataSet object actually provides its own XML Schema format to pass in the SOAP message, one that better facilitates rehydrating an instance of the DataSet when it arrives at the client as a SOAP message The DataSet accomplishes this by implementing the IXmlSerializable interface, the methods of which the ASMX infrastructure calls when putting the document onto the wire Using this custom extension of the XML serializer, the DataSet is able to add metadata to the XML representing it on the wire The proxy uses this additional information to re-create the DataSet when taking messages off the wire.

Listing 7-4. Creating an extension method that retrieves all the entities in the Added, Modified, or Unchanged state class Program { static void Main(string[] args) { RunExample(); } static void RunExample() { using (var context = new EFRecipesEntities()) { var tech1 = new Technician { Name = "Julie Kerns" }; var tech2 = new Technician { Name = "Robert Allison" }; context.ServiceCalls.AddObject(new ServiceCall { ContactName = "Robin Rosen", Issue = "Can't get satellite signal.", Technician = tech1 }); context.ServiceCalls.AddObject(new ServiceCall { ContactName = "Phillip Marlowe", Issue = "Channel not available", Technician = tech2 }); // now get the entities we've added foreach (var tech in context.ObjectStateManager.GetEntities<Technician>()) { Console.WriteLine("Technician: {0}", tech.Name); foreach (var call in tech.ServiceCalls) { Console.WriteLine("\tService Call: Contact {0} about {1}", call.ContactName, call.Issue); } } } } } public static class StateManagerExtensions { public static IEnumerable<T> GetEntities<T>(this ObjectStateManager manager) { var entities = manager .GetObjectStateEntries(~EntityState.Detached) .Where(entry => !entry.IsRelationship && entry.Entity != null) .Select(entry => entry.Entity).OfType<T>(); return entities; } }

There is no support for implementing this interface on your own types in version 1x of the Framework This isn t to say it hasn t been done, but it hasn t been a sanctioned activity, and is more difficult than it needs to be due to some hard-coded dependencies on the DataSet object This changes in version 20 of the Framework This interface is exposed and there s full support for implementing it with your own types When you do so, the ASMX infrastructure calls a method of your type to get the XML Schema for how your type should be represented in the SOAP message, and calls a method on the interface to actually get the XML stream representing your type This gives you very precise control over how your type is represented on the wire.

CandidateCollection true returned containing one address CandidateCollection with two addresses, neither of which is a 100% match false returned

The following is the output of the code in Listing 7-4: Technician: Julie Kerns Service Call: Contact Robin Rosen about Can't get satellite signal. Technician: Robert Allison Service Call: Contact Phillip Marlowe about Channel not available

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