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4 Personalization: User Profiles and Themes
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Properties that don t have a default value can be initialized in the Page_Load event when the page is not posting back. Here s how you can do that:
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if (!IsPostBack) { // Store a default value for the Links property if (Profile.Links.Count == 0) { Profile.Links.Add( http://www.contoso.com ); Profile.Links.Add( http://www.northwind.com ); } }
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At the end of the request, the contents of the profile object are flushed into the personalization storage medium and are easily retrieved the next time the page is invoked. The following code demonstrates a Web page that loads and saves personalized settings for the anonymous user:
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<%@Page language="C# %> <%@Import namespace="System.Drawing %> <script runat="server"> void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { // Store a default value for the Links property if (Profile.Links.Count == 0) { Profile.Links.Add( http://www.contoso.com ); Profile.Links.Add( http://www.northwind.com ); } } ApplyPersonalization(); } void ApplyPersonalization() { // Use the BackColor property to paint the body of the page theBody.Attributes["bgcolor"] = Profile.BackColor; // Use the Links property to create a right-aligned top menu Favorites.Controls.Clear(); foreach (object o in Profile.Links) { HyperLink h = new HyperLink(); h.Text = o.ToString(); h.NavigateUrl = o.ToString(); Favorites.Controls.Add(h); Favorites.Controls.Add(new LiteralControl(    )); } } void OnSetColor (object sender, EventArgs e) { // Change the BackColor property and apply changes to the page // The new value is provided by a textbox in the page
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Part I ASP.NET Essentials
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Profile.BackColor = NewColor.Text; ApplyPersonalization(); } void OnAddLink (object sender, EventArgs e) { // Add a link to the Links collection and apply changes Profile.Links.Add(NewLink.Text); ApplyPersonalization(); } </script> <html> <head runat="server"> <title>Personalization</title> </head> <body runat="server id="theBody style="margin:0px"> <form runat="server"> <asp:PlaceHolder Runat="server ID="Favorites /> <hr /> <table><tr> <td><asp:textbox runat="server id="NewColor /></td> <td><asp:button runat="server text="Save Back Color onclick="OnSetColor /></td> </tr><tr> <td><asp:textbox runat="server id="NewLink /></td> <td><asp:button runat="server text="Save Link onclick="OnAddLink /></td> </tr></table> </form> </body> </html>
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The page contains a couple of text boxes you can use to enter the color as a string (yellow, for example) and the URL of a new favorite link, as shown in Figure 4-3. By clicking the buttons next to either text box, you can modify the profile and apply the changes to the current instance of the page.
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Figure 4-3 If you enter a new URL and click to save it, the menu of the page is permanently modified.
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C04620245.fm Page 121 Thursday, June 3, 2004 4:51 PM
4 Personalization: User Profiles and Themes
Pages that make intensive use of personalization should also provide a user interface (or a separate editor, much as Web Parts do) to let users modify settings and personalize the visual appearance of the page.
Note The personalization data of a page is all set when the
Page_Init event fires. ASP.NET 2.0 also defines a Page_PreInit event. When this event arrives, no operation has been accomplished yet on the page, not even the loading of personalization data.
Personalization Events
The personalization data is added to the HTTP context of a request before the request begins its processing route. Once bound to the HTTP context object, the personalization data is available through the Profile property. But which system component is in charge of loading personalization data ASP.NET 2.0 employs a new HTTP module for this purpose named ProfileModule. The module attaches itself to a couple of HTTP events and gets involved after a request has been authorized and when the request is about to end. If the personalization feature is off, the module returns immediately. Otherwise, it fires the Personalize event to the application and loads personalization data from the current user profile. When the Personalize event fires, the personalization data hasn t been loaded yet. Next the module deals with anonymous users. As mentioned, anonymous users can store and retrieve settings that are persisted using an anonymous unique ID. However, if at a certain point a hitherto anonymous user decides to create an account with the Web site, you might need to migrate to its account all the settings that she made as an anonymous user. This migration doesn t occur automatically. The personalization module fires an event MigrateAnonymous that, properly handled, allows you to import anonymous settings into the profile of a logged on user. The following pseudocode demonstrates how to handle the migration of an anonymous profile:
void Personalization_MigrateAnonymous(object sender, AnonymousIdentificationEventArgs e) { // Get the profile of the anonymous user HttpProfile anonProfile; anonProfile = Profile.GetProfile(e.AnonymousId); // Migrate the properties to the new profile Profile.BackColor = anonProfile.BackColor; }
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