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While it would work to return a DataTable from a WCF service method, recall that WCF was built to honor the use of SOA principles, one of which is to program against contracts, not implementations Therefore, you won t return the NET-specific DataTable type to an external caller; instead you will return a custom data contract (InventoryRecord) that will be correctly expressed in the contained WSDL document in an agnostic manner Also note that the interface listed previously defines an overloaded method named InsertCar() The first version takes four incoming parameters, while the second version takes an InventoryRecord type as input.

You can define the InventoryRecord data contract as follows: [DataContract] public class InventoryRecord { [DataMember] public int ID; [DataMember] public string Make; [DataMember] public string Color; [DataMember] public string PetName; } If you were to implement this interface as it now stands, and then build a host and attempt to call these methods from a client, you might be surprised to see you ll get a runtime exception The reason: One of the requirements of a WSDL description is that each method exposed from a given endpoint must be uniquely named Thus, while method overloading works just fine as far as C# is concerned, the current web service specifications do not permit two identically named InsertCar() methods..

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Private ReadOnly Property CurrentStore() As UserStore Get If _CurrentStore Is Nothing Then _CurrentStore = UserStore.GetStore(_FileName) End If Return _CurrentStore End Get End Property Next, you have a large number of methods in your provider. These methods are for creating, updating, and deleting users as well as for accessing and retrieving user details. The methods basically access the information through the previously created store classes. Within those methods, you just have to call the appropriate methods of the UserStore class through the previously introduced CurrentStore property. These are the only methods defined by the provider. Any additional method introduced in this chapter is a helper method that you have to include on your own. (In this book, you will see the most important implementations of these methods but not all of them. The complete code is available with the book s download.) Let s get started with the CreateUser method.

Fortunately, the [OperationContract] attribute supports a named property (Name) that allows you to specify how the C# method will be represented within a WSDL description. Given this, you can update the second version of InsertCar() as follows: public interface IAutoLotService { ... [OperationContract(Name = "InsertCarWithDetails")] void InsertCar(InventoryRecord car); }

The CreateUser method is interesting because it needs to make sure that the user name and e-mail are unique and that the password is valid and adheres to the password strength requirements. Public Overrides Function CreateUser(ByVal username As String, _ ByVal password As String, ByVal email As String, _ ByVal passwordQuestion As String, ByVal passwordAnswer As String, _ ByVal isApproved As Boolean, ByVal providerUserKey As Object, _ <System.Runtime.InteropServices.Out()> ByRef status As MembershipCreateStatus) As MembershipUser Try ' Validate the user name and e-mail If (Not ValidateUsername(username, email, Guid.Empty)) Then status = MembershipCreateStatus.InvalidUserName Return Nothing End If ' Raise the event before validating the password MyBase.OnValidatingPassword(New ValidatePasswordEventArgs( username, password, True)) ' Validate the password If (Not ValidatePassword(password)) Then status = MembershipCreateStatus.InvalidPassword Return Nothing End If ... In the first section, the function calls the Private methods ValidateUserName and ValildatePassword. These methods make sure the user name and e-mail are unique in the store and the password adheres to the password strength requirements. After these checks succeed, you can create the user for the underlying store (SimpleUser), add the user to the store, and then save the store. ... ' Everything is valid; create the user Dim user As New SimpleUser() user.UserKey = Guid.NewGuid()

Now rename Service.cs to AutoLotService.cs. The AutoLotService type implements this interface as follows (be sure to import the AutoLotConnectedLayer and System.Data namespaces into this code file): using AutoLotConnectedLayer; using System.Data; public class AutoLotService : IAutoLotService { private const string ConnString = @"Data Source=(local)\SQLEXPRESS;Initial Catalog=AutoLot"+ ";Integrated Security=True"; public void InsertCar(int id, string make, string color, string petname) { InventoryDAL d = new InventoryDAL(); d.OpenConnection(ConnString); d.InsertAuto(id, color, make, petname); d.CloseConnection(); } public void InsertCar(InventoryRecord car) { InventoryDAL d = new InventoryDAL(); d.OpenConnection(ConnString); d.InsertAuto(car.ID, car.Color, car.Make, car.PetName); d.CloseConnection(); } public InventoryRecord[] GetInventory() { // First, get the DataTable from the database. InventoryDAL d = new InventoryDAL(); d.OpenConnection(ConnString); DataTable dt = d.GetAllInventoryAsDataTable(); d.CloseConnection();

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