无法读取类型“<var>X</var>”的对象，因为没有可以访问的构造函数。若要允许在 XAML 中使用此类型，请添加默认构造函数，使用 ConstructorArgumentAttribute 或提供 InstanceDescriptor。

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Unable to read objects of the type �<var>X</var>� because there are no accessible constructors. To allow this type to be used in XAML, add a default constructor, use ConstructorArgumentAttribute, or provide an InstanceDescriptor.

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