在不同方法中的按钮结束运行方法

Question

所以我有一些代码可以检查 USB 设备的插件和移除。

public void Main_Shown(object sender, EventArgs e)
        {
            var watcheradd = new ManagementEventWatcher();
            var queryadd = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2");
            watcheradd.EventArrived += new EventArrivedEventHandler(watcher_deviceadded);
            watcheradd.Query = queryadd;
            watcheradd.Start();


            var watcherremove = new ManagementEventWatcher();
            var queryremove = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 3");
            watcherremove.EventArrived += new EventArrivedEventHandler(watcher_deviceremoved);
            watcherremove.Query = queryremove;
            watcherremove.Start();   
}

我想知道我是否可以在我的程序退出之前停止 watchremove 和 watcheradd 循环以防止由以下停止代码引起的异常：

     private void Exit_Main(object sender, EventArgs e)
    {
        Process p = new System.Diagnostics.Process();
        ProcessStartInfo si = new System.Diagnostics.ProcessStartInfo();
        si.RedirectStandardInput = false;
        si.CreateNoWindow = true;
        si.UseShellExecute = false;
        si.FileName = "adb.exe";
        si.Arguments = "kill-server";
        p = Process.Start(si);
        p.WaitForExit();

        Application.Exit();
        //EXIT APPLICATION!!!            
    }

as Main_Shown.deviceadd.Stop(); 不是正确的语法或执行此操作的方法。结果应该安全地停止上面的循环，然后让程序无异常退出。

Answer 1

找到解决办法了。所以我需要添加

 ManagementEventWatcher watcheradd = new ManagementEventWatcher();
    WqlEventQuery queryadd = new WqlEventQuery();
    ManagementEventWatcher watcherremove = new ManagementEventWatcher();
    WqlEventQuery queryremove = new WqlEventQuery();

在 class 之上，并将 classes 设置为全局。所以现在它可以使用下面的代码毫无问题地退出。

`si.FileName = "adb.exe";
        si.Arguments = "kill-server";
        p = Process.Start(si);
        p.WaitForExit();
        watcherremove.Stop();
        watcheradd.Stop();
        Application.Exit();
        //EXIT APPLICATION!!`

感谢大家的帮助。

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