问题:
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) { Do Work();}dr =cmd.EndExecuteReader(ar);
D . while (!ar.AsyncWaitHandle.WaitOne()) { DoWork();}dr = cmd.EndExecuteReader(ar)
● 参考解析
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