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cessing is complete and just before the page is rendered in HTML. This is an ideal place to store any leftover information that is required. You cannot store view state information in an event handler for the Page.Unload event. Though your code will not cause an error, the information will not be stored in view state, because the final HTML page output is already rendered.

Summary

Listing 12-11. Student Model (app/models/student.rb)

You can store your own objects in view state just as easily as you store numeric and string types. However, to store an item in view state, ASP .NET must be able to convert it into a stream of bytes so that it can be added to the hidden input field in the page. This process is called serialization. If your objects aren t serializable (and by default they re not), you ll receive an error message when you attempt to place them in view state. To make your objects serializable, you need to add a Serializable attribute before your class declaration. For example, here s an exceedingly simple Customer class: [Serializable] public class Customer { private string firstName; public string FirstName { get { return firstName; } set { firstName = value; } }

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private string lastName; public string LastName { get { return lastName; } set { lastName = value; } }

public Customer(string firstName, string lastName) { FirstName = firstName; LastName = lastName; } } Because the Customer class is marked as serializable, it can be stored in view state: // Store a customer in view state. Customer cust = new Customer("Marsala", "Simons"); ViewState["CurrentCustomer"] = cust; Remember, when using custom objects, you ll need to cast your data when you retrieve it from view state. // Retrieve a customer from view state. Customer cust; cust = (Customer)ViewState["CurrentCustomer"]; Once you understand this principle, you ll also be able to determine which .NET objects can be placed in view state. You simply need to find the class information in the Visual Studio Help. The easiest approach is to look the class up in the index. For example, to find out about the FileInfo class (which you ll learn about in 18), look for the index entry FileInfo class. In the class documentation, you ll see the declaration for that class, which looks something like this: [Serializable] [ComVisible(true)] public sealed class FileInfo : FileSystemInfo If the class declaration is preceded with the Serializable attribute (as it is here), instances of this class can be placed in view state. If the Serializable attribute isn t present, the class isn t serializable, and you won t be able to place instances in view state.

Save this as app/models/student.rb. You also need to generate a grade model, which represents the grade each student received for each class:

We ve seen how Tapestry adheres to its goal of making the simplest choice the right choice along with its core principles of simplicity, efficiency, consistency, and feedback. Tapestry tackles web applications by breaking them into pages made up of components that are wired into Java classes. In web development with Tapestry the developer focuses on working with components, not dealing with session, URLs, or converting string values from the form into the appropriate Java paradigms. Building upon the standard servlet API, Tapestry will run on any application server or servlet container. Along with Tapestry s rich set of components, we have an evolving set of Ajax-enabled components from the Tacos library. Though still in beta, they provide robust functionality that allows us to Ajaxify a Tapestry application. Not only is Ajax development greatly simplified with Tacos, we even have built-in effects and complex widgets thanks to the high-quality Dojo library. Though we ve only scratched the surface, it s clear that Tacos and Tapestry are a great combination for creating robust, scalable web applications based on Java.

One of the most significant limitations with view state is that it s tightly bound to a specific page. If the user navigates to another page, this information is lost. This problem has several solutions, and the best approach depends on your requirements.

In the following sections, you ll learn two basic techniques to transfer information between pages: cross-page posting and the query string.

app/models/ test/unit/ test/fixtures/ app/models/grade.rb test/unit/grade_test.rb test/fixtures/grades.yml db/migrate db/migrate/002_create_grades.rb

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