vb.net code 39 generator software The Membership Provider in .NET

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The Membership Provider
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The beauty of the membership model lies not merely in the extremely compact code you need to write to validate or manage users but also in the fact that the model is abstract and extensible. If you have an existing data store filled with user information, you can integrate it with the Membership API without much
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Part III
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effort. All you have to do is write a custom data provider a class that inherits the MembershipProvider class which, in turn, inherits the ProviderBase class:
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public class OracleMembershipProvider : MembershipProvider { // Implements all abstract members of the class and, if // needed, defines custom functionality }
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The code shows the signature of a custom provider that uses an Oracle database to store its membership information. Once you have written your own made-to-measure provider, the only thing left to do is tell the membership subsystem to use the custom provider. This requires a little change in the application s web.config file, as shown here:
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<configuration> <system.web> <membership defaultProvider = Mainframe"> <providers> <add name="OracleMembershipProvider type="Samples.OracleMembershipProvider, samples /> </providers> </membership> </system.web> </configuration>
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In front of this declaration, the membership API instantiates the specified provider class and uses it through the implemented interfaces. No other action is required on your part.
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The ProviderBase Class
All the providers used in ASP.NET 2.0 implement a common set of members those defined by the ProviderBase class. The class comes with one method, Initialize, and one property, Name. The Name property returns the official name of the provider class. The Initialize method takes the name of the provider and a name/value collection object packed with the content of the provider s configuration section. The method is supposed to initialize its internal state with the values just read out of the web.config file.
The MembershipProvider Class
Many of the methods and properties used with the Membership class are actually implemented by calling a corresponding method or properties in the underlying provider. Table 10-7 lists the methods defined by the MembershipProvider base class.
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10
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Table 10-7 Methods of the MembershipProvider Class
Method ChangePassword
Description Takes a username in addition to the old and new password and changes the user s password.
ChangePasswordQuestionAndAnswer Takes a username and password and changes the pair of question/answer that allows reading and changing the password. CreateUser Creates a new user account and returns a MembershipUser-derived class. The method takes the username, password, and e-mail address. Deletes the record that corresponds to the specified username. Returns a collection of membership users whose e-mail address corresponds to the specified e-mail. Returns a collection of membership users whose username matches the specified username. Returns the collection of all users managed by the provider. Returns the number of users that are currently considered to be online. Takes the username and the password s answer and returns the current password for the user. Returns the information available about the specified username. Takes an e-mail address and returns the corresponding username. Takes the username and the password s answer and resets the user password to an autogenerated password. Updates the information available about the specified user. Validates the specified credentials against the stored list of users.
DeleteUser FindUsersByEmail
FindUsersByName
GetAllUsers GetNumberOfUsersOnline GetPassword GetUser GetUserNameByEmail ResetPassword
UpdateUser ValidateUser
All these methods are marked as abstract virtual (must-inherit, overridable according to the Visual Basic .NET jargon) in the class. The MembershipProvider class also features a few properties. They are listed in Table 10-8.
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Part III
Application Services
Table 10-8
Properties of the MembershipProvider Class
Description Gets and sets an optional string to identify the application Indicates whether the provider supports password reset Indicates whether the provider supports password retrieval Indicates whether the provider requires a question/ answer challenge to enable password changes
Property ApplicationName EnablePasswordReset EnablePasswordRetrieval RequiresQuestionAndAnswer
The provider can also store additional information with each user. You can derive a custom class from MembershipUser, add any extra members, and return an instance of that class via the standard GetUser method of the membership API. To use the new class, you must cast the object returned by GetUser to the proper type, as shown here:
MyCompanyUser user = (MyCompanyUser) Membership.GetUser(name);
In addition to the members listed in Table 10-7 and Table 10-8, a custom membership provider can add new and custom members. These are defined outside the official schema of the interface and are therefore available only to the users of the custom provider. For simplicity, the membership API tends to hide the underlying provider from the developer s view. In many cases, the API just routes the calls to the selected provider. However, this works well only if the invoked methods are part of the MembershipProvider base class. In the case of custom members, you must explicitly invoke the methods on the provider object. The following code illustrates how to retrieve the instance of a particular membership provider:
MyCompanyProvider prov; prov = (MyCompanyProvider) Membership.Providers["MyCompanyProvider"];
Note that the Providers collection is also the key property for authenticating users using a dynamically selected provider:
MembershipProvider prov; prov = (MembershipProvider) Membership.Providers["MyCompanyProvider"]; prov.ValidateUser(user, pswd);
This feature allows you to support multiple providers and authenticate users via a specific provider. For example, you can design your application to support a legacy database of users through a custom provider while storing new users in a standard SQL Server table. In this case, you use different membership providers for different users.
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