相依性属性中继资料应在属性系统使用相依性属性之前予以覆写。
Dependency property metadata should be overridden before the property system USES the dependency property.
所提供的中继资料会与存在于基底拥有者之相依性属性的属性中继资料合并。
The supplied metadata is merged with the property metadata for the dependency property as it exists on the base owner.
属性允许您将额外的描述资讯置入中继资料，其可使用执行阶段反映服务来撷取。
Attributes allow you to place extra descriptive information into metadata that can be extracted using runtime reflection services.
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