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LINQ的IN：
var queryResult = from p in db.Products where (new int?[] {1,2}).Contains(p.CategoryID) select p;
LINQ的NOT IN：
var queryResult = from p in db.Products where ! (new int?[] {1,2}).Contains(p.CategoryID) select p;
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原文地址：http://www.cnblogs.com/shanoon/p/5421027.html
