C# 在c语言中检测usb设备的插入和删除#

我在这个线程中尝试了一种解决方案。但我仍然会出错，因为对windows窗体控件的线程不安全调用

这是我的密码

private void initWatchers()
{

    WqlEventQuery insertQuery = new WqlEventQuery("SELECT * FROM __InstanceCreationEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_USBHub'");

    ManagementEventWatcher insertWatcher = new ManagementEventWatcher(insertQuery);
    insertWatcher.EventArrived += new EventArrivedEventHandler(DeviceInsertedEvent);
    insertWatcher.Start();

    WqlEventQuery removeQuery = new WqlEventQuery("SELECT * FROM __InstanceDeletionEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_USBHub'");
    ManagementEventWatcher removeWatcher = new ManagementEventWatcher(removeQuery);
    removeWatcher.EventArrived += new EventArrivedEventHandler(DeviceRemovedEvent);
    removeWatcher.Start();

}

在事件处理程序中，我启动了backgroundworker

private void DeviceInsertedEvent(object sender, EventArrivedEventArgs e)
{ 
  this.backgroundWorker1.RunWorkerAsync();
}
void DeviceRemovedEvent(object sender, EventArrivedEventArgs e)
{
 this.backgroundWorker1.RunWorkerAsync();
}

backgroundworker完成后，我确实可以访问windows窗体中的控件

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
// access some controls of my windows form
}

---

所以现在我仍然会因为不安全的控件调用而出错。知道为什么吗？

这是因为GUI元素位于应用程序的GUI线程中，您正试图从BackGroundWorker线程访问它们。您必须使用委托来处理来自BackgroundWorker的GUI元素。例如：

    GUIobject.Dispatcher.BeginInvoke(
        (Action)(() => { string value = myTextBox.Text; }));

---

在RunWorkerCompleted上，您仍在尝试从BackGroundWorker访问GUI元素。

但是在这里的backroundworker示例中：不需要使用委托。现在正确的解决方案是什么？