我有两种方法:
public void Stop(bool immediate)
{
Logger.Log(LogLevel.Debug, "Shutdown detected. Immediate: " + immediate);
Shutdown();
Logger.Log(LogLevel.Debug, "Unregistering");
HostingEnvironment.UnregisterObject(this);
}
public void Shutdown()
{
Logger.Log(LogLevel.Debug, "Preparing to stop UploadQueue");
IsProcessing = false;
//Set tasks to cancel to prevent queued tasks from parsing
_cancellationTokenSource.Cancel();
Logger.Log(LogLevel.Debug, "Waiting for " + _workerTasks.Count + " tasks to finish or cancel.");
//Wait for tasks to finish
Task.WaitAll(_workerTasks.Values.ToArray());
Logger.Log(LogLevel.Debug, "Stopped UploadQueue");
}
该类使用IRegisteredObject接口来接收关闭通知。在我的日志中,我得到了以下内容:
2014-07-18 15:30:55,913,DEBUG,Shutdown detected. Immediate: False
2014-07-18 15:30:55,913,DEBUG,Preparing to stop UploadQueue
2014-07-18 15:30:55,913,DEBUG,Waiting for 35 tasks to finish or cancel.
...
bunch of stuff
...
2014-07-18 15:31:28,471,DEBUG,Shutdown detected. Immediate: True
2014-07-18 15:31:28,471,DEBUG,Preparing to stop UploadQueue
2014-07-18 15:31:28,471,DEBUG,Waiting for 0 tasks to finish or cancel.
2014-07-18 15:31:28,471,DEBUG,Stopped UploadQueue
2014-07-18 15:31:28,471,DEBUG,Unregistering
第一次为什么没有到达Logger.Log(LogLevel.Debug, "Stopped UploadQueue");
?它肯定会取消任务并让正在运行的任务完成。 (任务在运行之前检查是否已取消,否则执行其操作)。