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You will now learn how to implement your custom provider for the membership and roles services. Creating a custom provider involves the following steps: 1. Design and create the underlying data store. 2. Create utility classes for accessing the underlying data store. 3. Create a class that inherits from the MembershipProvider. 4. Create a class that inherits from the RoleProvider. 5. Create a provider test application. 6. Configure the custom providers in your test application. 7. Use the custom providers in your custom application. Implementing custom providers is fairly straightforward but will require some time, as you have to implement lots of methods and properties. In the following sections, you will create a custom membership and roles provider that uses an XML file as the underlying data store. XML files are not a good solution for highly scalable applications but may be a nice alternative if you write a simple application and need to host this application on a provider site and don t have access to a database such as SQL Server.

Figure 25-11. Working with the WCF Service Configuration Editor You have no need to further configure your WCF MathService; at this point, you can move on to the task of building a custom host.

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Before creating a custom provider, you have to think about the overall design of the solution. Your goal is to keep the underlying functionality as simple as possible so that you can concentrate on the actual membership and roles provider implementation. In terms of XML, the easiest way to load and save data to XML files is XML serialization. This allows you to store a complete object graph with just one function call in a file and to read it with one function call. Dim Serializer As New XmlSerializer(GetType(List(Of SimpleUser))) Using reader As New XmlTextReader(fileName) Users = CType(Serializer.Deserialize(reader), (List(Of SimpleUser))) End Using Because classes such as MembershipUser don t allow you to access some information for example, the password you cannot use them with XML serialization directly; XML serialization requires all properties and members that need to be stored as public properties or members. Therefore, you will create your own representation of users and roles as utility classes for the back-end store. These classes will never be passed to the application, which simply relies on the existing membership classes. (You will include some mapping logic, which is fairly simple, between this internal user representation and the MembershipUser class.) Figure 26-2 shows the overall design of the custom provider solution.

Hosting a WCF service from within a console application (or within a GUI desktop application, for that matter) is not an ideal choice for a production-level server, given that the host must remain running visibly in the background to service clients. Even if you were to minimize the hosting application to the Windows taskbar, it would still be far too easy to accidentally shut down the host, thereby terminating the connection with any client applications.

SQL HQL HibernateDaoSupport SELECT * FROM USERS WHERE user_id = :id ; from User u where u.userId = :id; User user = (User) getHibernateTemplate.get(User.Class, id);

As mentioned, the SimpleUser and SimpleRole classes make XML serialization possible. Although this requires some mapping logic for supporting MembershipUser, this makes the whole implementation much easier. UserStore and RoleStore are both utility classes for encapsulating the access to the XML file. These classes include functions for loading and saving XML files as well as some basic utility functions for searching information in the store. Finally, the model includes the XmlMembershipProvider and XmlRoleProvider classes. XmlMembershipProvider inherits basic functionality from MembershipProvider, while XmlRoleProvider is inherited from RoleProvider. Both base classes are defined in the System.Web.Security namespace.

Note While it is true that a desktop Windows application does not have to show a main window, a typical *.exe does require user interaction to load the executable. However, you can configure a Windows service (described next) to run even if no users are currently logged on to the workstation.

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