单选题
发布日期:2021-03-17
client.BeginGetFlight(GetFlightCallback, null); client.GetFlight();
client.GetFlight(); client.BeginGetFlight(GetFlightCallback, null);
client.GetFlightCompleted += new EventHandler
IAsyncResult asyncResult = client.BeginGetFlight(GetFlightCallback, client); client.EndGetFlight(asyncResult);
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