内容选取机制可以透过编译到类别中继资料中的自订属性(亦称为静态内容属性)扩充。
The context selection mechanism is extensible through custom attributes, also known as static context properties, which are compiled into the class metadata.
您可以在这个关联的类别中，提供该资料模型没有的其他中继资料资讯。
In this associated class you provide additional metadata information that is not in the data model.
使用这个方法覆写特定衍生类别的中继资料后，若再尝试覆写此相同衍生类别的中继资料，将会引发例外状况。
After metadata for a particular derived class override is established with this method, subsequent attempts to override metadata on this same derived class will raise an exception.
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