This interface specifies the signature for a factory that takes a DataReader type and creates a domain object from it.

这个接口为一个工厂定义了使用datareader类型创建一个域(domain)对象的签名。

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The DataReader class can incrementally load the results of the same query and present a single row at a time to an application.

datareader类可以递增地加载同一查询的结果，并且一次向应用程序提交单个行。

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