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Part II
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ASP.NET Pages and Server Controls
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In a Web site project, the personalization data of a page is available only on demand precisely, the first time you access the profile object. Let s consider some sample code that illustrates the power of the user profile API. Note The personalization data of a page is all set when the Page_Init event fires. However, when
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the Page_PreInit event arrives, no operation has been accomplished yet on the page, not even the loading of personalization data.
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User Profiles in Action
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Suppose you have a page that displays information according to user preferences. You should use the user profile API only to store preferences, not to store sensitive data. Losing the profile information should never cause the user any loss of money or serious inconvenience. Here s the code you might have at the startup of the page request. The page first grabs in some way some weather-related information and then displays it as configured by the user:
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protected void Page_Load(Object sender, EventArgs e) { if (!IsPostBack) { var info = GrabWeatherInfo(); DisplayData(info); } } private static WeatherInfo GrabWeatherInfo() { ... } private void DisplayData(WeatherInfo info) { // Type-safe solution for Web Application projects // (reusing the YourApp.UserProfile wrapper class discussed earlier) // Get profile information from the underlying repository var profile = YourApp.UserProfile.GetUserProfile(); // Metric system var speedFormat = "{0} mph"; if (profile.UseEuroMetricSystem) speedFormat = "{0} kmh"; var speedText = String.Format(speedFormat, info.WindSpeed);
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7 Working with the Page
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// Temperature var tempText = String.Format("{0} {1}", info.Temperature, profile.TempSystem); lblWindSpeed.Text = speedText; lblTemperature.Text = tempText; // The sample page also displays a panel for users to change settings. // Display current settings through the edit panel as well. chkEuroMetric.Checked = profile.UseEuroMetricSystem; rdlTempSystem.SelectedIndex = (profile.TempSystem == "F" 0 : 1); }
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The output of the page can change depending on the settings entered by individual users. Figure 7-7 shows what the same page might look like for distinct users.
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FIGURE 7-7 Different settings for different users.
Part II
ASP.NET Pages and Server Controls
If anonymous access is permitted, any unauthenticated user is treated as the same one meaning that all anonymous users share the same settings and any can change in the settings of one user affects all the others. (Most of the time, though, sites where profiles are fundamental just don t allow anonymous access.) How do you change settings Here s the code you can associate with the Save button you see in Figure 7-7:
protected void Button1_Click(Object sender, EventArgs e) { // Retrieve and update the profile for the current user var profile = YourApp.UserProfile.GetUserProfile(); profile.UseEuroMetricSystem = chkEuroMetric.Checked; profile.TempSystem = rdlTempSystem.SelectedItem.Value; // Persist settings for the current user profile.Save(); // Refresh the page to ensure changes are immediately visible Response.Redirect("/profile.aspx"); }
The Redirect call is not strictly required; however, if it s omitted, it won t give the user an immediate experience based on the changes entered. If you omit the redirect, the changes (which are stored in the repository, anyway) will be visible only upon the next request.
Personalization Events
As mentioned, the personalization data is added to the HTTP context of a request before the request begins its processing route. But which system component is in charge of loading personalization data ASP.NET employs an 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 then loads personalization data from the current user profile. When the Personalize event fires, the personalization data hasn t been loaded yet. Handlers for events fired by an HTTP module must be written to the global.asax file.
void Profile_Personalize(object sender, ProfileEventArgs e) { ProfileCommon profile = null; // Exit if it is the anonymous user if (User == null) return; // Determine the profile based on the role. The profile database // contains a specific entry for a given role.
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