如何刷新管理对象 [英] How to refresh management object

问题描述

这是我的代码，

Here is my Code,

ManagementObjectSearcher searcher =
new ManagementObjectSearcher("SELECT * FROM Win32_USBControllerDevice");
foreach (ManagementObject mo in searcher.Get())
{
    string str1 = mo["CurrentRefreshRate"].ToString();
    Console.WriteLine(str1);
    string dependent = mo["Dependent"].ToString();
    string deviceId = dependent.Split(''='')[1];
    deviceId = deviceId.Replace(''\"'', ''\'');
    ManagementObjectSearcher searcher2 =
    new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity Where DeviceID = " + deviceId);
    foreach (ManagementObject mo2 in searcher2.Get())
    {
        HardwareDetails Detail = new HardwareDetails();
        Detail.Description = mo2["Description"].ToString();
        Detail.DeviceId = mo2["DeviceId"].ToString();
        string[] str = Detail.DeviceId.Split(''\\'');
        string Id = str[1];
        if (Id.Contains(''&''))
        {
            string[] separate = Id.Split(''&'');
            Detail.Vid = separate[0].Contains(''_'') ? separate[0].Split(''_'')[1] : separate[0].Split(''D'')[1];
            Detail.Pid = separate[1].Contains(''_'') ? separate[1].Split(''_'')[1] : separate[1].Split(''D'')[1];
            //Detail.Pid = pid1[1];
        }
        else
        {
            Detail.Vid = "";
            Detail.Pid = "";
        }
        if (list.Count > 0)
        {
            foreach (HardwareDetails h in list)
            {
                if (!(h.Description == Detail.Description))
                {
                    list.Add(Detail);
                    break;
                }
            }
        }
        else
            list.Add(Detail);
    }
}
// remove duplicates, sort alphabetically and convert to array
HardwareDetails[] usbDevices = list.ToArray();
return usbDevices;

我已经编写了代码来显示连接的USB设备的描述(名称).删除设备后，我需要刷新ManagementObject并仅显示仍连接的设备的描述.

我该怎么做?

I had written code to display the description(Name) of connected USB devices. Once I remove a device I need to refresh the ManagementObject and have to display only the description of device still connected.

How do I do this?

推荐答案

假设使用WinForm应用程序，您可以覆盖表单的标准WndProc，并捕获有关要添加/删除和删除的设备的广播消息.根据这些信号采取行动.这是骨架:

Assuming a WinForm app, you could override your Form''s standard WndProc and catch the broadcast messages about devices being added/removed and act on those signals. Here is a skeleton:

protected override void WndProc(ref Message m) {
    if (m.Msg==WM_DEVICECHANGE) {
        int wParam=(int)m.WParam;
        if (wParam==DBT_DEVICEARRIVAL) DeviceAdded();
        if (wParam==DBT_DEVICEREMOVECOMPLETE) DeviceRemoved();
    }
}

涉及的常量为:WM_DEVICECHANGE = 0x0219，DBT_DEVICEARRIVAL = 0x8000，DBT_DEVICEREMOVECOMPLETE = 0x8004

:)

The constants involved are: WM_DEVICECHANGE = 0x0219, DBT_DEVICEARRIVAL = 0x8000, DBT_DEVICEREMOVECOMPLETE = 0x8004

:)

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