Can NHibernat开发者_运维知识库e linq/lambda expressions be compiled so they aren't reevaluate on every use?
Compiling them (into delegates) would make them execute in memory, which is something you definitely do NOT want.
They must stay as expression trees in order to be parsed into Criteria expressions (2.x contrib provider) or HQL trees (3.x provider), and then into SQL.
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是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
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