Class provides static type information that is obtained from metadata 类提供从元数据获得的静态类型信息。
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Static type information 静态类型信息
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This attribute supplies a way for developers to provide custom metadata for their authored classes . this capability extends the static type information functionality in the 此属性为开发人员提供了一种为其所编写的类提供自定义元数据的方法。