检查天气是否正在运行 [英] Check weather a perticuler process is running or not

问题描述

大家好



我正在尝试使用以下代码检查天气是否正常运行

  Dim  myProcesses（） As 处理
 myProcesses = Process.GetProcessesByName（  devenv.exe）
 如果 myProcesses.Count>  0  然后 
 lblClient.Text =  正在运行 
 否则 
 lblClient.Text =  未运行 
 结束 如果 

但它没有显示输出。



请告诉我哪里错了..



谢谢

解决方案

< blockquote>当我使用没有.exe扩展名的进程名称时它工作

如果你获得了类型 System.Diagnostics.Process类型进程的实例，它确实至少在通话时运行。稍后，您可以这样检查： http://msdn.microsoft .com / zh-cn / library / system.diagnostics.process.hasexited.aspx [ ^ ]。



但是如果你只需要等待进程退出，你不应该等待它，这是一种非常低效的技术。您需要这样做：

http://msdn.microsoft.com/ en-us / library / fb4aw7b8.aspx [ ^ ]，

http://msdn.microsoft。 com / en-us / library / ty0d8k56.aspx [ ^ ]。



如果你使用 WaitForExit 调用线程不会浪费等待期间的任何CPU时间。它将被设置为一个特殊的等待状态：关闭并且不会被调度回执行，直到它被相关进程终止（或超时）唤醒。

-SA

Hi all

I am trying to check weather a perticular process is running or not using the below code

Dim myProcesses() As Process
myProcesses = Process.GetProcessesByName("devenv.exe")
If myProcesses.Count > 0 Then
lblClient.Text = "Running"
Else
lblClient.Text = "Not Running"
End If

But it's not showing the output.

Please tell me where i am wrong..

Thank you

解决方案

It worked when i am using the process name without the extension of .exe

If you obtained the instance of some process of the type System.Diagnostics.Process, it was certain running at least at the moment of call. Later on, you can check it up this way: http://msdn.microsoft.com/en-us/library/system.diagnostics.process.hasexited.aspx[^].

But if you simply need to wait for process exit, you should not speen-wait for it, which is a very inefficient technique. You need to do this:
http://msdn.microsoft.com/en-us/library/fb4aw7b8.aspx[^],
http://msdn.microsoft.com/en-us/library/ty0d8k56.aspx[^].

If you use WaitForExit the calling thread won't waste any CPU time during wait. It will be set to a special wait state: switched off and not scheduled back to execution until it is waken up by the termination of the process in question (or by a timeout).

—SA

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