***使用包含所有Locked文档的视图，该视图按PC密钥左右排序.或使用按键和状态排序的视图，这样您就可以挑选出特定PC的所有锁定文档.如果没有，GetDocumentByKey将返回Nothing.

Better use a view that contains all Locked documents, ordered by the PC key or so. Or use a view sorted by key and Status, so you can pick out all locked documents for a specific PC. If there aren't any, GetDocumentByKey will return Nothing.