C# 不同方法中的按钮端运行方法
所以我有一些代码来检查插件和USB设备的删除C# 不同方法中的按钮端运行方法,c#,loops,managementeventwatcher,C#,Loops,Managementeventwatcher,所以我有一些代码来检查插件和USB设备的删除 public void Main_Shown(object sender, EventArgs e) { var watcheradd = new ManagementEventWatcher(); var queryadd = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2");
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程序退出之前停止watchremove
和watcheradd
循环,以防止停止代码在以下范围内出现异常:
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!!!
}
如图所示,Main_.deviceadd.Stop()
不是正确的语法或方法。
结果应该安全地停止上述循环,然后允许程序毫无例外地退出。找到了解决方案。
所以我需要补充一点
ManagementEventWatcher watcheradd = new ManagementEventWatcher();
WqlEventQuery queryadd = new WqlEventQuery();
ManagementEventWatcher watcherremove = new ManagementEventWatcher();
WqlEventQuery queryremove = new WqlEventQuery();
将类设置为全局的。现在,使用下面的代码,它可以顺利退出
`si.FileName = "adb.exe";
si.Arguments = "kill-server";
p = Process.Start(si);
p.WaitForExit();
watcherremove.Stop();
watcheradd.Stop();
Application.Exit();
//EXIT APPLICATION!!`
谢谢大家的帮助。为什么Stop不正确?您的意思是拦截关闭应用程序事件吗?你能澄清一下吗?因为它是用另一种方法运行的,所以不起作用。我编辑了原始代码以反映这一点。如果要调用Stop()方法,则watcheradd和watcherremove不能是局部变量。让它们成为类的字段。只是为了澄清一些事情。我会使用
{}
来封装watcheradd和watcherremove,然后在别处调用它吗?或者它需要从中得到更多。链接到文章