C# 列出带有C和WMI的USB设备

我试图在我的应用程序中实现一个功能，列出计算机中所有插入式USB大容量存储设备

我的代码在启动应用程序时运行良好，但我的问题是，我希望在移除或连接USB设备时，表单中的框会自动刷新

实现DBT_DEVICEARRIVAL和DBT_DeviceMoveComplete条件应该可以工作，但我得到了一个断开连接的上下文检测到异常

我了解到我需要使用一个委托并设置一个异步调用，这样才能正常工作

这是我的密码：

          public void listUSB()
      {
        ManagementScope sc = new ManagementScope(wmiUsbList);

        ObjectQuery query = new ObjectQuery("select * from Win32_DiskDrive " + "where InterfaceType='USB'");

        ManagementObjectSearcher searcher = new ManagementObjectSearcher(sc, query);
        ManagementObjectCollection result = searcher.Get();

        foreach (ManagementObject obj in result)
            {
                 if (obj["DeviceID"] != null)
                        {
                            usbListTextBox.AppendText(obj["Model"].ToString());
                        }
            }

      }

我很想知道如何将委托应用于我的方法

我还研究了MSDN上的线程，它提供了一个很好的示例，但在那个示例中，我不理解如何将deviceList放入文本框中

我还在学习，所以如果有人能在我的一个或两个问题上为我指出正确的方向，我将不胜感激

谢谢

尝试使用ManagementEventWatcher并为EventWatcher分配事件处理程序

我不知道如何做到这一点，但这里有一个监听打印事件的观察者：

string printQuery = "Select * From __InstanceCreationEvent Within 1 Where TargetInstance ISA 'Win32_PrintJob'";
string nspace = @"\\.\root\CIMV2";
var watcher = new ManagementEventWatcher(nspace, printQuery);

希望能有帮助

   private usbListArrayDelegate mDeleg;

      protected override void WndProc(ref Message m)
      {
          int devType;
          base.WndProc(ref m);

          switch (m.WParam.ToInt32())
          {
              case DBT_DEVICEARRIVAL:

                  devType = Marshal.ReadInt32(m.LParam, 4);

                  if (devType == DBT_DEVTYP_VOLUME)
                  {
                      // usb device inserted, call the query       
                      mDeleg = new usbListArrayDelegate(usbListArray);
                      AsyncCallback callback = new AsyncCallback(usbListArrayCallback);


                      // invoke the thread that will handle getting the friendly names   
                      mDeleg.BeginInvoke(callback, new object());   

                  }

                  break;

              case DBT_DEVICEREMOVECOMPLETE:       

                  devType = Marshal.ReadInt32(m.LParam, 4);

                  if (devType == DBT_DEVTYP_VOLUME)
                  {
                      mDeleg = new usbListArrayDelegate(usbListArray);
                      AsyncCallback callback = new AsyncCallback(usbListArrayCallback);


                      // invoke the thread that will handle getting the friendly names   
                      mDeleg.BeginInvoke(callback, new object());   
                  }

                  break;
         }
      }

      public ArrayList usbListArray()
      {
          ArrayList deviceList = new ArrayList();

           manager = new UsbManager();   ==> about how to implement this please see http://www.codeproject.com/Articles/63878/Enumerate-and-Auto-Detect-USB-Drives

          UsbDiskCollection disks = manager.GetAvailableDisks();

          foreach (UsbDisk disk in disks)
          {
              deviceList.Add(disk);              
          }

          return deviceList;
      }   

      // delegate wrapper function for the getFriendlyNameList function   
      private delegate ArrayList usbListArrayDelegate();

      // callback method when the thread returns   
      private void usbListArrayCallback(IAsyncResult ar)
      {
          string ArrayData = string.Empty;
          // got the returned arrayList, now we can do whatever with it   
          ArrayList result = mDeleg.EndInvoke(ar);

          int count = 0;

          foreach (UsbDisk disk in result)
          {
              ++count;

              ArrayData += count + ") " + disk.ToString().
           }