Entity SQL 示例 不能正确执行

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using (AdventureWorksEntities AWEntities = new AdventureWorksEntities()) { ObjectQuery<Product> products = AWEntities.Product; IQueryable<Product> productsQuery = from product in products select product; Console.WriteLine("Product Names:"); foreach (var prod in productsQuery) { Console.WriteLine(prod.Name); } }
 Console.WriteLine("Product Names:"); 可以正常执行,
执行  foreach 就直接异常返回, 且异常无法捕获,  
在调试输出窗口显示 引发的异常:“System.Data.SqlClient.SqlException”(位于 System.Data.dll 中) 
该代码示例地址  https://msdn.microsoft.com/zh-cn/library/bb738694(v=vs.90).aspx