Process.Kill() 似乎没有终止进程

Question

我在使用 Process.Kill() 时遇到问题。我想我一定是误解了它是如何工作的。这是我的测试功能。我启动了一个长运行进程 (ping -t)，然后在五秒后将其终止。

我可以看到 ping 进程出现，但在我的程序完成后该进程仍然存在。我必须手动杀死它。

Console.WriteLine("Total number of ping processes is {0}", Process.GetProcessesByName("ping").Length);

ProcessStartInfo startInfo = new ProcessStartInfo("cmd.exe");
Process process = new Process();

startInfo.CreateNoWindow = true;
startInfo.UseShellExecute = false;
startInfo.Arguments = "/c ping -t 8.8.8.8";

Console.WriteLine("Staring ping process");
process.StartInfo = startInfo;
process.Start();
Thread.Sleep(5000);

Console.WriteLine("Total number of ping processes is {0}", Process.GetProcessesByName("ping").Length);
Thread.Sleep(5000);

Console.WriteLine("Killing ping process");
process.Kill();
Thread.Sleep(5000);

Console.WriteLine("Total number of ping processes is {0}", Process.GetProcessesByName("ping").Length);

我做错了什么？

Answer 1

In order to kill a process you have to run under an administrative account. This means either that you are a 'true' administrator or you User Account Control (UAC) turned off.

Otherwise Process.Kill() will fail.

来自 here.

Answer 2

process.Kill() 正在运行，只是不在您认为的过程中。您正在做的实际上是启动 2 个进程并且只终止第一个进程，而第二个进程保持运行ning。您拥有的代码正在启动一个新命令 shell 并将该进程信息保存到 process。当你调用 process.Kill() 只有命令 shell 正在退出你可以运行

Console.WriteLine(process.ProcessName);

在您 process.Kill() 之前查看哪个进程实际将被终止。通过将 \c ping -t 8.8.8.8 设置为命令 shell 的参数，您告诉命令 shell 启动另一个进程（在本例中为 ping）并将其与自身分离。您的程序不知道子进程，也不会杀死它。如果您真正想要的只是终止 ping 进程，您可以将代码更改为：

Console.WriteLine("Total number of ping processes is {0}",  Process.GetProcessesByName("ping").Length);

ProcessStartInfo startInfo = new ProcessStartInfo("ping");
Process process = new Process();

startInfo.CreateNoWindow = true;
startInfo.UseShellExecute = false;
startInfo.Arguments = "-t 8.8.8.8";

Console.WriteLine("Staring ping process");
process.StartInfo = startInfo;
process.Start();
Thread.Sleep(5000);

Console.WriteLine("Total number of ping processes is {0}", Process.GetProcessesByName("ping").Length);
Thread.Sleep(5000);

Console.WriteLine("Killing ping process");
process.Kill();
Thread.Sleep(5000);

Console.WriteLine("Total number of ping processes is {0}", Process.GetProcessesByName("ping").Length);

但是，如果您确实需要首先启动命令 shell，您需要找到子进程并有逻辑来终止它。类似于：

foreach( var p in Process.GetProcessesByName("ping"))
{
  p.Kill();
}

[编辑] *抱歉，我一开始没有看到@Adriano Repetti 的评论。我不是故意要多余的。

Answer 3

您启动了 cmd.exe，然后 cmd.exe 启动了子进程 ping.exe。要杀死 ping.exe 你可以杀死所有进程层次结构。例如使用 WMI（添加 System.Management 参考）：

private static void KillProcessAndChildrens(int pid)
{
    ManagementObjectSearcher processSearcher = new ManagementObjectSearcher
      ("Select * From Win32_Process Where ParentProcessID=" + pid);
    ManagementObjectCollection processCollection = processSearcher.Get();

    try
    {
        Process proc = Process.GetProcessById(pid);
        if (!proc.HasExited) proc.Kill();
    }
    catch (ArgumentException)
    {
        // Process already exited.
    }

    if (processCollection != null)
    {
        foreach (ManagementObject mo in processCollection)
        {
            KillProcessAndChildrens(Convert.ToInt32(mo["ProcessID"])); //kill child processes(also kills childrens of childrens etc.)
        }
    }
}

Answer 4

这是答案的补丁，因为它的答案泄漏了子进程的子进程。

private static void KillProcessAndChildrens(int pid)
{
    ManagementObjectSearcher processSearcher = new ManagementObjectSearcher
      ("Select * From Win32_Process Where ParentProcessID=" + pid);
    ManagementObjectCollection processCollection = processSearcher.Get();

    // We must kill child processes first!
    if (processCollection != null)
    {
        foreach (ManagementObject mo in processCollection)
        {
            KillProcessAndChildrens(Convert.ToInt32(mo["ProcessID"])); //kill child processes(also kills childrens of childrens etc.)
        }
    }

    // Then kill parents.
    try
    {
        Process proc = Process.GetProcessById(pid);
        if (!proc.HasExited) proc.Kill();
    }
    catch (ArgumentException)
    {
        // Process already exited.
    }
}

Answer 5

FWIW Julio 修改的 VS2019 Visual Basic 版本。

   Private Sub KillProcessAndChildrens(pintPID As Integer)

      Dim processSearcher As New ManagementObjectSearcher("Select * From Win32_Process Where ParentProcessID=" + pintPID.ToString)

      Dim processCollection As ManagementObjectCollection = processSearcher.Get()
      '     We must kill child processes first!
      If Not IsNothing(processCollection) Then
         For Each mo As ManagementObject In processCollection
            KillProcessAndChildrens(Convert.ToInt32(mo.Item("ProcessID")))
         Next
      End If

      '    // Then kill parents.
      Try
         Dim proc As Process = Process.GetProcessById(pintPID)
         If Not proc.HasExited Then
            proc.Kill()
         End If

      Catch ex As Exception
         '         Process already exited.
      End Try
   End Sub

Process.Kill() 似乎没有终止进程

Process.Kill() doesn't seem to kill the process

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