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In s 21 and 23 you learned many details of the integrated membership and roles services. These services provide you with an out-of-the-box solution for managing users and roles with forms authentication. As explained earlier, you can extend the model through providers, as shown in Figure 26-1. When implementing custom providers, you should always keep the architecture shown in Figure 26-1 in mind. A custom provider is always based on the lowest level in the layered model introduced by the ASP.NET 2.0 membership and roles framework. It s important to know that every other provider-based API in ASP.NET 2.0 is structured in the same way. Therefore, implementing custom providers for the profiles API or the personalization engine of ASP.NET 2.0 is similar.

Another benefit of making use of the WCF Service Library project is that you are able to right-click on the App.config file within the Solution Explorer to activate the GUI-based Service Configuration Editor, SvcConfigEditor.exe (see Figure 29-10). This same technique can be used from a client application that has referenced a WCF service.

SQL HQL HibernateDaoSupport SELECT * FROM USERS; from User; List<User> users = getHibernateTemplate.loadAll(User.Class);

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As you can see from their basic architectures, the membership and roles services are independent from each other. Therefore, membership providers and Role providers have separate base classes; in addition, you can store membership users and roles in different back-end systems. A good example is when using the roles service with Windows authentication. Remember what you learned in 23 about application-specific roles that are used for authorization within the application instead of within Windows groups: This provides you with a way to decouple your application from an underlying Active Directory infrastructure. Before you learn about the details of implementing custom providers, it s important to understand why you might want to create a custom membership provider. Some common reasons include the following: You want to use an existing user and roles database that has a different schema than the ASP.NET standard. You want to use a database other than Microsoft SQL Server. You want to use an unusual data store (such as an XML file, web service, or Active Directory). You want implement additional authentication logic. A good example of this is often implemented for governmental websites where users have to authenticate by specifying three values: a user name, a subscription ID, and a password.

Figure 25-10. GUI-based *.config file editing starts here Once you activate this tool, you can change the XML-based data using a friendly user interface. Using a tool such as this to maintain your *.config files provides many benefits. First (and foremost), you can rest assured that the generated markup conforms to the expected format and is typo-free. Second, it is a great way to see the valid values that could be assigned to a given attribute. Finally, you no longer need to author tedious XML data manually. Figure 25-11 shows the overall look-and-feel of the Service Configuration Editor. Truth be told, an entire chapter could be devoted to describing all of the interesting options SvcConfigEditor.exe supports (e.g., COM+ integration and creation of new *.config files). Be sure to take time to investigate this tool; also be aware that you can access a fairly detailed help system by pressing F1.

If you just want to store your own information in addition to the information stored by the default implementation, we recommend not implementing a custom provider. Because the membership API gives you access to a key that uniquely identifies a user in the store, we recommend adding your own tables for storing your additional information and connecting information stored in your tables through the user s unique key with the actual user of the membership provider s storage; alternatively, you could implement user profiles for these additional properties. This is far easier than implementing a custom provider for adding a few extra values. From within the application, you can access the user s unique key through the ProviderUserKey property of the MembershipUser class. In this chapter, you will learn how the unique key is propagated to the ProviderUserKey of the MembershipUser class.

Note The SvcConfigEditor.exe utility can edit (or create) configuration files, even if you do not select an initial WCF Service Library project. Use a Visual Studio 2010 command window to launch the tool, and then use the File Open menu option to load an existing *.config file for editing.

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