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.Net Code：

            using (testEntities MyEntity = new testEntities())
            {
                #region linq to entities 内容练习3
                var result = from s in MyEntity.stuinfo
                             where s.username == "pkm"
                             select new
                             {
                                 username=s.username,
                                 age=s.age
                             };
                var psql = result.GetType().GetMethod("ToTraceString").Invoke(result, null);//得到原始sql语句
                
                Console.WriteLine(psql);
                #endregion
            }