Question

我想在两种不同的类型上使用WaitForMultipleObjects：

'EventWaitHandle'
a'Process.Handle'==＆gt; IntPtr的

我不知道如何将（以适当的方式）“process.Handle”转换为WaitHandle以使以下代码有效：

   var waitHandles = new WaitHandle[2];
   waitHandles[0] = waitHandleExit;
   // Next line is the offending one:
   waitHandles[1] = new SafeWaitHandle(process.Handle, false);
   int waitResult = WaitHandle.WaitAny(waitHandles, timeOut);

我得到错误：

Error   1   Cannot implicitly convert type 'Microsoft.Win32.SafeHandles.SafeWaitHandle' to 'System.Threading.WaitHandle' ...

有人知道等待进程和EventWaitHandle的正确方法吗？

更新...我选择答案的原因。

首先感谢所有人：Jaroen，Slugart和Sriram。所有答案都非常好。

Jaroen解决方案因为我忽略的原因在我的机器上无效。我的'退出'事件从未发生过（也许只在Disposed？）。
Slugart解决方案运作良好，我在尝试之前尝试了它。
Sriram解决方案工作得很好，我选择了它，因为我没有创建一个错误的EventWaitHandle，根据我的愿景似乎更干净。

非常感谢!!!

Answer 1

您可以subclass the WaitHandle代表Process.Handle并使用该WaitHandle的实例等待。

public class ProcessWaitHandle : WaitHandle
{
    private readonly Process process;
    public ProcessWaitHandle(Process process)
    {
        this.process = process;
        this.SafeWaitHandle = new SafeWaitHandle(process.Handle, false);
    }
}

var waitHandles = new WaitHandle[2]
{
    waitHandleExit,
    new ProcessWaitHandle(process)
};
int waitResult = WaitHandle.WaitAny(waitHandles, timeOut);

Answer 2

进程句柄当然不是等待的，也不是和WaitHandle在同一个继承树中。您需要将它包装在一个事件中（它确实扩展了WaitHandle），例如：

 ManualResetEvent resetEvent = new ManualResetEvent(true);
 resetEvent.SafeWaitHandle = new SafeWaitHandle(new IntPtr(process.Handle.ToPointer()), false);
 waitHandles[1] = = resetEvent;

所有WaitHandle实现都将使用SafeWaitHandle："The SafeWaitHandle class is used by the System.Threading.WaitHandle class. It is a wrapper for Win32 mutexes and auto and manual reset events."

Answer 3

您可以创建自己的EventWaitHandle并在Process.Exited事件中进行设置：

var waitHandle = new ManualResetEvent(false);
process.Exited += (sender, e) => waitHandle.Set()
waitHandles[1] = waitHandle;

如何等待2中的第一个：进程和EventWaitHandle

3 个答案: