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public class Page : TemplateControl, IHttpHandler Caching { public virtual HttpSessionState Session {get;} State management // }
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[ Team LiB ] public sealed class HttpContext : IServiceProvider { public HttpSessionState Session {get;} // }
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Because the HttpSessionState class supports string and ordinal-based indexers, it can be populated and accessed using the standard array access notation that most developers are familiar with from traditional ASP There are some new properties, however, including flags for whether the session key is being maintained with cookies or with mangled URLs (IsCookieless) and whether the session state is read-only (IsReadOnly) Also note that although the CodePage property is accessible through session state, this is for backward compatibility only The proper way to access the response's encoding is through ResponseContentEncodingCodePage
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Table of Contents
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For an example of using session state, let's Essential ASPNET navigates amongconsiderC#of an application,of theselects items to be retained in with Examples in an implementation she classic shopping cart for a Web application As a user the pages ByFritz Onion a shopping cart for future purchase When the user is done shopping, she can navigate to a checkout page, review the items she has collected in her cart, and purchase them This requires the Web application to Publishercollection of Wesley the user has chosen across request boundaries, which is exactly what session : Addison items retain a Pub Date : February 11, 2003 state provides Listing 10-4 shows the definition of a class called Item Instances of this class are used to represent the selected items in our shopping cart ISBN : 0-201-76040-1
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Pages : 432
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Listing 10-4 Item Class
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public class Item "This well-conceived and well-written book has extensive knowledge and priceless experience overflowing { from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and private skill"-J _description; architectural string Fred Maples, Director of Software Engineering, NASDAQcom private int _cost;
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Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through public It provides experienced programmers with version 11Item(string description, int cost) the information needed to fully understand the { technology, and is a clear guide to using ASPNET to build robust and well architected Web applications
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_description = description;
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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how _cost = cost; it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, } including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, Description public string and custom control development Throughout the book, working examples illustrate best practices for building Web-based applications in C# {
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get { return _description; }
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Among the topics explored in = value; } set { _description depth are:
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} public int Cost { ASPNET architecture get { return _cost; } Web forms set { _cost = value; } } Configuration
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To store Item instances on behalf of the client, we initialize a new ArrayList in session state and populate Diagnostics and error handling the ArrayList with items as the client selects them If you need to perform one-time initialization of data in session state, the Session_Start event in the Application class is the place to do so Listing 10-5 Validation shows a sample handler for the Session_Start event in our application object, which in our case is Data binding creating a new ArrayList and adding it to the session state property bag indexed by the keyword "Cart"
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Custom controls Listing 10-5 Initializing Session State Objects Caching
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// in globalasax State management public class Global : SystemWebHttpApplication {
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protected [ Team LiB ] void Session_Start(Object sender, EventArgs e) { // Initialize shopping cart Session["Cart"] = new ArrayList(); } }
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A sample page that uses the shopping cart is shown in Listings 10-6 and 10-7 In this page, two handlers are defined: one for purchasing a pencil and another for purchasing a pen To keep things simple, the items and their costs have been hard-coded, but in a real application this information would normally come from a database lookup When the user elects to add an item to her cart, the AddItem method is called This allocates a new instance of the Item class and initializes it with the description and cost of the item to be purchased That new item is then added to the ArrayList maintained by the Session object, indexed by the string "Cart"Listings 10-8 and 10-9 show a sample page that displays all the items in the current Table of Contents client's cart along with a cumulative total cost
Essential ASPNET with Examples in C#