ef 里面用linq Contains() 操作 会引起 sql 磁盘 巨读

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其实是个bug.在ef 6.2里面已经修复.

 

http://stackoverflow.com/questions/7897630/why-does-the-contains-operator-degrade-entity-frameworks-performance-so-drama/7936350#7936350

http://entityframework.codeplex.com/wikipage?title=Updating%20Applications%20to%20use%20EF6

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