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Answer 1

相反，这些命名空间确实有意义并且映射到CLR命名空间。例如，System.Windows程序集包含以下属性：

[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Controls")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Controls.Primitives")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Data")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Documents")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Ink")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Input")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Media")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Media.Animation")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Media.Effects")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Media.Imaging")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Media.Media3D")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Shapes")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows.Automation")]
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml", "System.Windows.Markup")]

这些属性将xml名称空间“http://scemas.microsoft.com/winfx/2006/xaml/presentation”映射到属性定义的CLR名称空间集。

您还可以使用类似“clr-namespace：System.Windows.Controls; assembly = System.Windows”的字符串显式引用clr名称空间（不使用XmlnsDefinitionAttribute）。 XmlnsDefinitionAttribute允许将多个CLR命名空间映射到单个Xml命名空间。

xmlns：x是一个特殊的预定义命名空间，它包含不一定映射到CLR类型的XAML语言功能（例如x：Name，x：Key，x：Class等）。

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