You have an SQL query that takes one minute to execute. You use the following code segment

to execute the SQL query asynchronously.IAsyncResult ar = cmd.BeginExecuteReader();You need to execute a method named Do Work() that takes one second to run while the SQL query is executing. DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use？（）

A.while（ar.AsyncWaitHandle==null）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；

B.while（!ar.IsCompleted）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；

C.while（Thread.CurrentThread.ThreadState==ThreadState.Running）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；

D.while（!ar.AsyncWaitHandle.WaitOne（））{DoWork（）；}dr=cmd.EndExecuteReader（ar）；

提问人：网友jyw1120 发布时间：2022-01-07

参考答案

查看官方参考答案

如搜索结果不匹配，请联系老师获取答案

您可能会需要：

重置密码查看订单联系客服

安装简答题APP，拍照搜题省时又省心！

更多“You have an SQL query that tak…”相关的问题

第1题

You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.Dim ar As IAsyncResult = cmd.BeginExecuteReader()You need to execute a method named DoWork() that takes one second to run while the SQL query is executing. DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

A. While ar.AsyncWaitHandle Is Nothing DoWork()End Whiledr = cmd.EndExecuteReader(ar)

B. While Not ar.IsCompleted DoWork()End Whiledr = cmd.EndExecuteReader(ar)

C. While T hread.CurrentThread.ThreadState = ThreadState.Running DoWork()End Whiledr = cmd.EndExecuteReader(ar)

D. While Not ar.AsyncWaitHandle.WaitOne() DoWork()End Whiledr = cmd.EndExecuteReader(ar)

点击查看答案

第2题

You should spend about 40 minutes on this task. Write about the following topic: As children become adults, their social behaviour changes in some ways. What are the main differences between young childrens social behaviour and that of adults? To what extent are the changes that take place good? Give reasons for your answer, and include any relevant examples from your own knowledge or experience. Write at least 250 words.

点击查看答案

第3题

When you discuss a question of policy, you must deal with three basic issues–need, plan, and practicality.

点击查看答案

第4题

When you read the headline “Cure That ‘Is Worse Than the Problem’” from the Internet, what do you predict to read in the article? Choose a content that best describes your prediction.

A、A new drug has been discovered but it is far too expensive.

B、A doctor criticizes the use of medicines in general.

C、A widely used drug is found to cause more harm than good.

D、People would face their problems better if they did not take drugs.

点击查看答案

第5题

If you have materials or a portfolio to present, hand it over before the interviewer has asked to review it.

点击查看答案

第6题

A late acceptance must be invalid and have no binding on the offeror.

点击查看答案

第7题

Passage 2: Lower-class criminals are more likely to be caught than wealthy criminals. And once caught, they are less likely to be able to afford highly skilled legal representation. When they appear in court, their life history—which often includes quitting school, unemployment, divorce, and an apparent lack of responsibility when judged by middle-class standards—may work against them. As a result, lower-income criminals are likely to receive heavier penalties than higher-income criminals for the same crime. And because they often cannot afford bail, lower-income criminals often have to wait for trial in jail cells rather than in the comfort of their own homes.

A、Lower-class criminals are more popular than higher-class criminals

B、Lower-class criminals tend to suffering more than higher-class criminals

C、Lower-class criminals are more likely to be caught than higher-class criminals

D、Lower-class criminals are more likely to stay at home for their trails

点击查看答案