进程队列定时器
我想使用计时器每 10 秒扫描一次队列。如果此队列中有超过 0 个项目，则将第一个项目 Deque，将其作为参数传递给 Process 并运行该进程。执行此进程时应禁用计时器。一旦进程退出，它应该重新启用计时器。
队列中的项目可以手动添加，也可以来自数据库。
第一个进程完成后，以下 C# 代码不起作用。由于某种原因，计时器不再启用。有人可以帮忙吗？
public MainForm()
{
InitializeComponent();
queue = new Queue<string>();
process = new Process();
process.Exited += new EventHandler(Process_Exited);
process.EnableRaisingEvents = true;
}
void StartProcess(string args)
{
ProcessStartInfo psi = new ProcessStartInfo();
psi.FileName = @"C:\Program Files\My Software\RunProcess.exe";
psi.Arguments = args;
psi.WindowStyle = ProcessWindowStyle.Minimized;
process.StartInfo = psi;
process.Start();
}
void Process_Exited(object sender, EventArgs e)
{
timer.Enabled = true;
}
void Timer_Tick(object sender, EventArgs e)
{
if (queue.Count > 0)
{
timer.Enabled = false;
StartProcess(queue.Dequeue());
}
}
I want to scan a queue every 10 seconds using a Timer. If there are more then 0 items in this queue then Deque the first one, pass it as an argument to a Process and run that process. The timer should be disabled while this process executes. Once the process exits, it should re-enable the timer.
The items in the queue can be added manually or can come from a database.
The following C# code does not works after the first process is finished. For some reason the timer is not enabled again. Can somebody help?
public MainForm()
{
InitializeComponent();
queue = new Queue<string>();
process = new Process();
process.Exited += new EventHandler(Process_Exited);
process.EnableRaisingEvents = true;
}
void StartProcess(string args)
{
ProcessStartInfo psi = new ProcessStartInfo();
psi.FileName = @"C:\Program Files\My Software\RunProcess.exe";
psi.Arguments = args;
psi.WindowStyle = ProcessWindowStyle.Minimized;
process.StartInfo = psi;
process.Start();
}
void Process_Exited(object sender, EventArgs e)
{
timer.Enabled = true;
}
void Timer_Tick(object sender, EventArgs e)
{
if (queue.Count > 0)
{
timer.Enabled = false;
StartProcess(queue.Dequeue());
}
}
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评论（3）
由于时间不够，我没有查找详细信息，但我发现将
timer.Enabled = true;分派到 UI 线程即可解决问题。编辑：刚刚检查了 MSDN：“这个 Windows 计时器是为单线程环境设计的，其中 UI 线程用于执行处理。它要求用户代码有一个可用的 UI 消息泵，并且始终从同一个线程进行操作，或将调用编组到另一个线程”
I didn't look up the details for lack of time but I found out that dispatching
timer.Enabled = true;to the UI thread will do the trick.EDIT: Just checked MSDN: "This Windows timer is designed for a single-threaded environment where UI threads are used to perform processing. It requires that the user code have a UI message pump available and always operate from the same thread, or marshal the call onto another thread. "
考虑使用 Process.WaitForExit() 而不是处理 Exited 事件。这样，您可以设置超时值（以防进程永远不会退出），并且可以从 Timer_Tick() 方法中启动/停止计时器。
Consider using Process.WaitForExit() instead of handling the Exited event. This way, you can set a timeout value (in case the process never exits) and you can start/stop the timer from within the Timer_Tick() method.
运气好的话：
？
Any luck with:
?