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Initializing the provider and creating and validating users are the most important and hardest functions to implement in the provider. The rest of the functions are just for reading information from the store and for updating the users in the store. Basically, these functions call the underlying methods of the UserStore class or try to find users in the UserStore.Users collection. A typical example is the GetUser() method, which retrieves a single user from the data store based on its user name or key: public override MembershipUser GetUser(string username, bool userIsOnline) { try { SimpleUser user = CurrentStore.GetUserByName(username); if (user != null) { if (userIsOnline) { user.LastActivityDate = DateTime.Now; CurrentStore.Save(); } return CreateMembershipFromInternalUser(user); } else { return null; } } catch { throw; } } This example accepts the name of the user as a parameter and another parameter that indicates whether the user is online. This parameter is automatically initialized by the Membership class when it calls your provider s method. In your method, you can query this parameter; if it is set to true, you must update the LastActivityDate of your user in the store. The function does nothing other than find the user in the underlying store by calling the UserStore s GetUserByName method. It then creates an instance of MembershipUser based on the information of the store by calling the

private CreateMembershipFromInternalUser utility method. The provider implementation requires you to implement a couple of methods that work this way. You just need to call the methods of the UserStore appropriately. Some of the methods require you to not return just a MembershipUser but a whole MembershipUserCollection, as follows: public override MembershipUserCollection FindUsersByEmail(string emailToMatch, int pageIndex, int pageSize, out int totalRecords) { try { List<SimpleUser> matchingUsers = CurrentStore.Users.FindAll(delegate(SimpleUser user) { return user.Email.Equals(emailToMatch, StringComparison.OrdinalIgnoreCase); }); totalRecords = matchingUsers.Count; return CreateMembershipCollectionFromInternalList(matchingUsers); } catch { throw; } } For example, the FindUsersByEmail method finds all users with a specific e-mail (which is possible only if you have configured the provider to not require the e-mail to be unique or if you use pattern matching for e-mails through regular expressions). It returns a collection of Membership users. But as you can see, the method again leverages the FindAll method of the List<> class and an anonymous method for specifying the filter criteria. Therefore, the collection returned from this method is a collection of SimpleUser instances that you use in the back-end store. You can create another helper method for mapping this type of collection to a MembershipUserCollection, as follows: private MembershipUserCollection CreateMembershipCollectionFromInternalList( List<SimpleUser> users) { MembershipUserCollection ReturnCollection = new MembershipUserCollection(); foreach (SimpleUser user in users) { ReturnCollection.Add(CreateMembershipFromInternalUser(user)); } return ReturnCollection; } Finally, the LastActivityDate property stored for every user is used by Membership to determine the number of current users online in the application. You have to implement this method in your custom provider through the GetNumberOfUsersOnline method, as follows: public override int GetNumberOfUsersOnline() { int ret = 0; foreach (SimpleUser user in CurrentStore.Users) {

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if (user.LastActivityDate.AddMinutes( Membership.UserIsOnlineTimeWindow) >= DateTime.Now) { ret++; } } return ret; } This method just goes through all users in the store and uses the UserIsOnlineTimeWindow, which is a property managed through the Membership class and specifies the number of minutes a user is online without any activity. As long as the LastActivityDate with this number of minutes is larger than the current date and time, the user is considered to be online. The LastActivityDate is updated automatically by the different overloads of the GetUser method and the ValidateUser method. Implementing the remaining functions of the provider does not involve any new concepts, and therefore we will skip them. They merely update some values on users and then call the CurrentStore.Save method to save it to the XML file on the file system. You can download the complete implementation of this provider with the source code for the book.

Note Slug fields are prepopulated using JavaScript while editing the model instance in the admin application. This is a useful convenience, saving the time and trouble of having to visit a separate field as long as the default slug is suitable. When creating objects in Python, the only way a field gets populated without an explicit value is through a function passed in as its argument or through the field s method.

Implementing the Roles provider is much easier than implementing the Membership provider, because the structures are much simpler for managing roles. Implementing the Roles provider does not introduce any new concepts. It merely requires calling the appropriate methods of the previously introduced RoleStore class for creating roles, deleting roles, assigning users to roles, and deleting users from roles. The complete interface of the Roles provider looks like this: public class XmlRoleProvider : RoleProvider { public override void Initialize(string name, NameValueCollection config) public override string ApplicationName { get; set; } public public public public override override override override CreateRole(string roleName) DeleteRole(string roleName, bool throwOnPopulatedRole) RoleExists(string roleName) AddUsersToRoles( string[] usernames, string[] roleNames) void RemoveUsersFromRoles( string[] usernames, string[] roleNames) string[] GetAllRoles() string[] GetRolesForUser(string username) string[] GetUsersInRole(string roleName) bool IsUserInRole(string username, string roleName) string[] FindUsersInRole( string roleName, string usernameToMatch) void bool bool void

As you can see, the class derives from the base class RoleProvider. Again, it overrides the Initialize method for initializing custom properties. But this time initialization of the provider is much simpler because the Roles provider supports only a handful of properties. The only property provided by the base class is the ApplicationName property. Everything else is up to you. Therefore, initialization is fairly simple here:

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