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Table of Contents
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Essential ASPNET with Examples in C#
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ByFritz Onion Publisher Pub Date ISBN Pages : Addison Wesley : February 11, 2003 : 0-201-76040-1 : 432
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"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 architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how 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, and custom control development Throughout the book, working examples illustrate best practices for building Web-based applications in C# Among the topics explored in depth are:
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102 Application State
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Application state is something that should be used with care, and in most cases, avoided altogether Although it is a convenient repository for global data in a Web application, its use can severely limit the scalability of an application, especially if it is used to store shared, updateable state It is also an unreliable place to store data, because it is replicated with each application instance and is not saved if the application is recycled With this warning in mind, let's explore how it works Application state is accessed through the Application property of the HttpApplication class, which returns an instance of class HttpApplicationState This class is a named object collection, which means that it can hold data of any type as part of a key/value pair Listing 10-1 shows a typical use of application state As soon Table of application is started, it loads the data from the database Subsequent data accesses as the Contents will not need to go to the database but will instead access the application state object's cached version Essentialprefetched in this wayExamples in C# it will not be unloaded from the application until ASPNET with must be static, because Data that is ByFritz Onion the application is recycled or otherwise stopped and restarted
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Publisher Pub Date ISBN
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Listing 10-1 Sample Use of Application State for Data Prefetching
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: February 11, 2003 : 0-201-76040-1
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Pages Inside of globalasax : 432 //
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void Application_Start(object src, EventArgs e) { DataSet ds = new DataSet(); // population and well-written book has extensive knowledge and "This well-conceived of dataset from ADONET query not shown priceless experience overflowing
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from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and // Cache DataSet reference architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom
Application["FooDataSet"] = ds; } Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through version 11 It provides experienced programmers with the information needed to fully understand the // and is a page within the application technology, In someclear guide to using ASPNET to build robust and well architected Web applications private void Page_Load(object src, EventArgs e)
This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how { it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, DataSet ds = (DataSet)(Application["FooDataSet"]); including the server-side compilation model, code-behind classes, server-side controls, form validation, the // data binding model, and custom control development Throughout the book, working examples illustrate MyDataGridDataSource = ds; best practices for building Web-based applications in C# //
Among the topics explored in depth are:
Because it is likely that multiple clients will be serviced by the same application, there is a potential for ASPNET architecture concurrent access to application state The HttpApplicationState class protects access to its collection of objects with an instance of the HttpApplicationStateLock class, a derivative of the Web forms ReadWriteObjectLock class This class provides two alternate mechanisms for locking, one for reading and one for writing Multiple reader locks may be acquired simultaneously, but to acquire a writer lock, all Configuration other locks must be released first This type of locking mechanism is particularly useful for protecting state in the HTTP pipeline application state bag because it allows multiple readers to pass through concurrently, and restricts access only when a request tries to write to the state bag The general usage model of application-level state is to update and error handling read it frequently, so concurrent readers are a common occurrence Diagnostics it infrequently and In traditional ASP, it was always on the shoulders of the developer to call Lock and Unlock on the Validation application object whenever it was modified or accessed In ASPNET, however, these calls are made Data binding implicitly for you whenever you insert items into or read items from the state bag in the form of either AcquireWrite() or AcquireRead(), depending on whether an item is being inserted or accessed There Custom need to is typically no controls explicitly call Lock() and UnLock() when working with the application state bag These methods do exist, however, and internally calling the Lock() method acquires a writer lock on the Caching internalHttpApplicationStateLock class It is important to note that making explicit calls to Lock() andUnLock() defeats the multiple-reader efficiency of this new locking mechanism and should therefore be State management avoided in most cases
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state bag is when you are updating a shared piece of state For example, Listing 10-2 shows a sample page that uses shared, updateable application state In this example, each time the page is accessed, the string identifying the client browser type (RequestBrowserBrowser) is used as an index into the HttpApplicationState collection, where a count is maintained to keep track of how many times this page was accessed with each client browser type The page then renders a collection of paragraph elements displaying the browser names along with how many times each browser was used to access this page These statistics continue to accumulate for the lifetime of the application Note that before the value in the application state bag is retrieved and updated, ApplicationLock() is called, and once the update is complete, ApplicationUnLock() is called This acquires a writer lock on the application state bag and guarantees that the value will not be read while the update is being performed If we did not take care to callLock, a potential race condition would exist, and the value keeping track of the number of browser hits for a particular browser type would not necessarily be correct Listing 10-2 Sample Use of Application State