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XAML Unleashed by Adam Nathan

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Using Built-in System Data Types

Windows Store and universal apps can reference four primitive types in XAML—Boolean, Double, Int32, and String—with the use of four special keywords in the XAML language namespace: x:Boolean, x:Int32, x:Double, and x:String. So although this doesn’t make up for the inability to reference primitive types such as Byte or Int64 by using the System namespace, it covers some of the common ones.

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