平台调用将按照在程序集中作为元数据存在的各个字段上设置的默认值来执行操作。
Platform invoke operates according to the default values set on various fields that exist as metadata in an assembly.
元数据默认值类型与其即将应用到的依赖项对象的类型之间的不匹配很难调试，因为编译期间检测不到这种不匹配。
Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation.
由样式、主题、模板设置的值、元数据中的默认值或属性值继承不被视为本地值。
Values that are set by styles, themes, templates, the default value from metadata, or property value inheritance are not considered to be local values.
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