By Emanuele Garofalo

This e-book is the proper creation for an individual eager to create refined home windows eight apps for the 1st time. Assuming just a easy wisdom of HTML and CSS we are going to stroll you thru the improvement procedure utilizing C# and VB. The booklet will familiarize you with the instruments you will need to take advantage of in an effort to utilize home windows' lovely new gains. you will find how one can reap the benefits of the integrated performance to create top of the range consumer studies.

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Additional info for Building Windows 8.1 Apps from the Ground Up

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The Register() method returns an instance of the BackgroundTaskRegistration class, which is useful for handling Completed and Progress events. With the marketplace system, the programmer can check some conditions of application usage, such as the license state for managing an evaluation version of the app. Store, which exposes the classes shown in Figure 2-8. info Chapter 2 ■ Windows Runtime Environment Figure 2-8. Store classes The most important item is CurrentApp, a static class that exposes all information that you need: the application identifier, the license information as an instance of the LicenseInformation class, and the link of the Windows Store web catalog.

Figure 2-3 shows application life cycle management. info Chapter 2 ■ Windows Runtime Environment Figure 2-3. Application life cycle management One of the problems of the previous version of Windows was installing and uninstalling applications without administration privilege. WinRT solves this problem in a way that doesn’t affect security. All Windows Store applications can be exclusively installed from the Windows 8 Store (the only exception is the installation through Visual Studio for developers’ purposes), the Microsoft Marketplace in which all developers can deploy its applications.

Figure 2-11. info Chapter 2 ■ Windows Runtime Environment To optimize application performance, you should run all tasks in parallel. Core namespaces (see Figure 2-12), in which the ThreadPool static class exposes two overloads of RunAsync() methods to run the parallelizable codes in separate threads. A thread pool is more efficient than a single thread because it can schedule work items when threads become available. You cannot control the order in which the threads are executed, but you can use a ThreadPoolTimer to delay the execution from the scheduling start and set a WorkItemPriority based on your needs.

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