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资源说明：Petzold的经典著作
This book focuses exclusively on writing Metro style applications. Plenty of other books already exist for writing desktop applications, including the 5th edition of Programming Windows.
For writing Metro style applications, a new object-oriented API has been introduced called the Windows Runtime or WinRT (not to be confused with the version of Windows 8 that runs on ARM processors, called Windows RT). Internally, the Windows Runtime is based on COM (Component Object Model) with interfaces exposed through metadata files with the extension .winmd located in the /Windows/System32/WinMetadata directory.
From the application programmer’s perspective, the Windows Runtime resembles Silverlight, although internally it is not a managed API. For Silverlight programmers, perhaps the most immediate difference involves namespace names: the Silverlight namespaces beginning with System.Windows have been replaced with namespaces beginning with Windows.UI.Xaml.
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