显示属性型别和属性的简短描述。

Shows the property type and a short description of the property.

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至少一组方法的最后参数型别必须与属性型别相符。

The type of the last parameter of at least one set method must match the type of the property.

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使用指定的属性名称、属性型别和拥有者型别，注册附加属性。

Registers an attached property with the specified property name, property type, and owner type.

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