如果您的应用程序中有一个窗口，则可以使用以下方法：
using System;using System.Runtime.InteropServices;internal static class UsbNotification{ public const int DbtDevicearrival = 0x8000; // system detected a new device public const int DbtDeviceremovecomplete = 0x8004; // device is gone public const int WmDevicechange = 0x0219; // device change event private const int DbtDevtypDeviceinterface = 5; private static readonly Guid GuidDevinterfaceUSBDevice = new Guid("A5DCBF10-6530-11D2-901F-00C04FB951ED"); // USB devices private static IntPtr notificationHandle; /// <summary> /// Registers a window to receive notifications when USB devices are plugged or unplugged. /// </summary> /// <param name="windowHandle">Handle to the window receiving notifications.</param> public static void RegisterUsbDeviceNotification(IntPtr windowHandle) { DevBroadcastDeviceinterface dbi = new DevBroadcastDeviceinterface { DeviceType = DbtDevtypDeviceinterface, Reserved = 0, ClassGuid = GuidDevinterfaceUSBDevice, Name = 0 }; dbi.Size = Marshal.SizeOf(dbi); IntPtr buffer = Marshal.AllocHGlobal(dbi.Size); Marshal.StructureToPtr(dbi, buffer, true); notificationHandle = RegisterDeviceNotification(windowHandle, buffer, 0); } /// <summary> /// Unregisters the window for USB device notifications /// </summary> public static void UnregisterUsbDeviceNotification() { UnregisterDeviceNotification(notificationHandle); } [Dllimport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr RegisterDeviceNotification(IntPtr recipient, IntPtr notificationFilter, int flags); [Dllimport("user32.dll")] private static extern bool UnregisterDeviceNotification(IntPtr handle); [StructLayout(LayoutKind.Sequential)] private struct DevBroadcastDeviceinterface { internal int Size; internal int DeviceType; internal int Reserved; internal Guid ClassGuid; internal short Name; }}在WPF窗口中使用它的方式如下（Windows窗体类似）：
protected override void onSourceInitialized(EventArgs e) { base.onSourceInitialized(e); // Adds the windows message processing hook and registers USB device add/removal notification. HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle); if (source != null) { windowHandle = source.Handle; source.AddHook(HwndHandler); UsbNotification.RegisterUsbDeviceNotification(windowHandle); } } /// <summary> /// Method that receives window messages. /// </summary> private IntPtr HwndHandler(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam, ref bool handled) { if (msg == UsbNotification.WmDevicechange) { switch ((int)wparam) { case UsbNotification.DbtDeviceremovecomplete: Usb_DeviceRemoved(); // this is where you do your magic break; case UsbNotification.DbtDevicearrival: Usb_DeviceAdded(); // this is where you do your magic break; } } handled = false; return IntPtr.Zero; }这是Windows窗体的使用示例（甚至更简单）：
public Form1(){ InitializeComponent(); UsbNotification.RegisterUsbDeviceNotification(this.Handle);}protected override void WndProc(ref Message m){ base.WndProc(ref m); if (m.Msg == UsbNotification.WmDevicechange) { switch ((int)m.WParam) { case UsbNotification.DbtDeviceremovecomplete: Usb_DeviceRemoved(); // this is where you do your magic break; case UsbNotification.DbtDevicearrival: Usb_DeviceAdded(); // this is where you do your magic break; } }}
