C#：基于WMI监视USB插拔 －－转自CSDN作者：Splash

参考资料：

USB Port Insert / Remove detection using WMI

USB Port Insert / Remove detection using WMI (Source Code)

下载：

USBWatcher.zip

实现类代码：

USBWatcher.cs

/* ----------------------------------------------------------
文件名称：WMIUsbWatcher.cs

作者：秦建辉

MSN：splashcn@msn.com
QQ：36748897

博客：http://blog.csdn.net/jhqin

开发环境：
    Visual Studio V2010
    .NET Framework 4 Client Profile

版本历史：
    V1.1    2011年08月19日
            增加对插拔USB设备的定位
 
    V1.0    2011年08月18日
            基于WMI实现对插拔USB设备的监视
------------------------------------------------------------ */
using System;
using System.Management;

namespace Splash.IO.PORTS
{
    /// <summary>
    /// USB控制设备类型
    /// </summary>
    public struct USBControllerDevice
    {
        /// <summary>
        /// USB控制器设备ID
        /// </summary>
        public String Antecedent;

        /// <summary>
        /// USB即插即用设备ID
        /// </summary>
        public String Dependent;
    }

    /// <summary>
    /// 监视USB插拔
    /// </summary>
    public partial class USB
    {        
        /// <summary>
        /// USB插入事件监视
        /// </summary>
        private ManagementEventWatcher insertWatcher = null;

        /// <summary>
        /// USB拔出事件监视
        /// </summary>
        private ManagementEventWatcher removeWatcher = null;

        /// <summary>
        /// 添加USB事件监视器
        /// </summary>
        /// <param name="usbInsertHandler">USB插入事件处理器</param>
        /// <param name="usbRemoveHandler">USB拔出事件处理器</param>
        /// <param name="withinInterval">发送通知允许的滞后时间</param>
        public Boolean AddUSBEventWatcher(EventArrivedEventHandler usbInsertHandler, EventArrivedEventHandler usbRemoveHandler, TimeSpan withinInterval)
        {
            try
            {
                ManagementScope Scope = new ManagementScope("root\\CIMV2");
                Scope.Options.EnablePrivileges = true;

                // USB插入监视
                if (usbInsertHandler != null)
                {   
                    WqlEventQuery InsertQuery = new WqlEventQuery("__InstanceCreationEvent",
                        withinInterval,
                        "TargetInstance isa 'Win32_USBControllerDevice'");

                    insertWatcher = new ManagementEventWatcher(Scope, InsertQuery);
                    insertWatcher.EventArrived += usbInsertHandler;
                    insertWatcher.Start();
                }

                // USB拔出监视
                if (usbRemoveHandler != null)
                {   
                    WqlEventQuery RemoveQuery = new WqlEventQuery("__InstanceDeletionEvent",
                        withinInterval,
                        "TargetInstance isa 'Win32_USBControllerDevice'");

                    removeWatcher = new ManagementEventWatcher(Scope, RemoveQuery);
                    removeWatcher.EventArrived += usbRemoveHandler;
                    removeWatcher.Start();
                }

                return true;
            }

            catch (Exception)
            {
                RemoveUSBEventWatcher();
                return false;
            }
        }

        /// <summary>
        /// 移去USB事件监视器
        /// </summary>
        public void RemoveUSBEventWatcher()
        {
            if (insertWatcher != null)
            {
                insertWatcher.Stop();
                insertWatcher = null;
            }

            if (removeWatcher != null)
            {
                removeWatcher.Stop();
                removeWatcher = null;
            }
        }        

        /// <summary>
        /// 定位发生插拔的USB设备
        /// </summary>
        /// <param name="e">USB插拔事件参数</param>
        /// <returns>发生插拔现象的USB控制设备ID</returns>
        public static USBControllerDevice[] WhoUSBControllerDevice(EventArrivedEventArgs e)
        {
            ManagementBaseObject mbo = e.NewEvent["TargetInstance"] as ManagementBaseObject;
            if (mbo != null && mbo.ClassPath.ClassName == "Win32_USBControllerDevice")
            {
                String Antecedent = (mbo["Antecedent"] as String).Replace("\"", String.Empty).Split(new Char[] { '=' })[1];
                String Dependent = (mbo["Dependent"] as String).Replace("\"", String.Empty).Split(new Char[] { '=' })[1];
                return new USBControllerDevice[1] { new USBControllerDevice { Antecedent = Antecedent, Dependent = Dependent } };
            }

            return null;
        }
    }
}

调用示例（线程安全）：

using System;
using System.Windows.Forms;
using System.Management;
using Splash.IO.PORTS;

namespace Splash
{
    public partial class Form1 : Form
    {
        USB ezUSB = new USB();
      
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ezUSB.AddUSBEventWatcher(USBEventHandler, USBEventHandler, new TimeSpan(0, 0, 3));
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            ezUSB.RemoveUSBEventWatcher();
        }

        private void USBEventHandler(Object sender, EventArrivedEventArgs e)
        {
            if (e.NewEvent.ClassPath.ClassName == "__InstanceCreationEvent")
            {
                this.SetText("USB插入时间：" + DateTime.Now + "\r\n");
            }
            else if (e.NewEvent.ClassPath.ClassName == "__InstanceDeletionEvent") 
            {
                this.SetText("USB拔出时间：" + DateTime.Now + "\r\n");
            }

            foreach (USBControllerDevice Device in USB.WhoUSBControllerDevice(e))
            {
                this.SetText("\tAntecedent：" + Device.Antecedent + "\r\n");
                this.SetText("\tDependent：" + Device.Dependent + "\r\n");
            }
        }

        // 对 Windows 窗体控件进行线程安全调用
        private void SetText(String text)
        {
            if (this.textBox1.InvokeRequired)
            {
                this.textBox1.BeginInvoke(new Action<String>((msg) =>  
                {
                    this.textBox1.AppendText(msg);  
                }), text);  
            }
            else
            {
                this.textBox1.AppendText(text);
            }
        }
    }
}

演示界面：

 

 

C#：基于WMI查询USB设备  

/* ----------------------------------------------------------
文件名称：WMIUsbQuery.cs

作者：秦建辉

MSN：splashcn@msn.com
QQ：36748897

博客：http://blog.csdn.net/jhqin

开发环境：
    Visual Studio V2010
    .NET Framework 4 Client Profile

版本历史：    
    V1.3    2011年09月08日    
            代码优化

    V1.2    2011年09月02日
            增加基于服务的查询

    V1.1    2011年09月01日
            增加基于设备ID的查询，解决LIKE子句中反斜杠字符引发的WQL查询异常

    V1.0    2011年08月30日
            基于WMI实现对USB设备的查询
------------------------------------------------------------ */
using System;
using System.Management;
using System.Text.RegularExpressions;
using System.Collections.Generic;

namespace Splash.IO.PORTS
{
    /// <summary>
    /// 即插即用设备信息结构
    /// </summary>
    public struct PnPEntityInfo
    {
        public String PNPDeviceID;      // 设备ID
        public String Name;             // 设备名称
        public String Description;      // 设备描述
        public String Service;          // 服务
        public String Status;           // 设备状态
        public UInt16 VendorID;         // 供应商标识
        public UInt16 ProductID;        // 产品编号 
        public Guid ClassGuid;          // 设备安装类GUID
    }    

    /// <summary>
    /// 基于WMI获取USB设备信息
    /// </summary>
    public partial class USB
    {      
        #region UsbDevice
        /// <summary>
        /// 获取所有的USB设备实体（过滤没有VID和PID的设备）
        /// </summary>
        public static PnPEntityInfo[] AllUsbDevices
        {
            get
            {
                return WhoUsbDevice(UInt16.MinValue, UInt16.MinValue, Guid.Empty);
            }
        }

        /// <summary>
        /// 查询USB设备实体（设备要求有VID和PID）
        /// </summary>
        /// <param name="VendorID">供应商标识，MinValue忽视</param>
        /// <param name="ProductID">产品编号，MinValue忽视</param>
        /// <param name="ClassGuid">设备安装类Guid，Empty忽视</param>
        /// <returns>设备列表</returns>
        public static PnPEntityInfo[] WhoUsbDevice(UInt16 VendorID, UInt16 ProductID, Guid ClassGuid)
        {
            List<PnPEntityInfo> UsbDevices = new List<PnPEntityInfo>();

            // 获取USB控制器及其相关联的设备实体
            ManagementObjectCollection USBControllerDeviceCollection = new ManagementObjectSearcher("SELECT * FROM Win32_USBControllerDevice").Get();
            if (USBControllerDeviceCollection != null)
            {
                foreach (ManagementObject USBControllerDevice in USBControllerDeviceCollection)
                {   // 获取设备实体的DeviceID
                    String Dependent = (USBControllerDevice["Dependent"] as String).Split(new Char[] { '=' })[1];

                    // 过滤掉没有VID和PID的USB设备
                    Match match = Regex.Match(Dependent, "VID_[0-9|A-F]{4}&PID_[0-9|A-F]{4}");
                    if (match.Success)
                    {
                        UInt16 theVendorID = Convert.ToUInt16(match.Value.Substring(4, 4), 16);   // 供应商标识
                        if (VendorID != UInt16.MinValue && VendorID != theVendorID) continue;

                        UInt16 theProductID = Convert.ToUInt16(match.Value.Substring(13, 4), 16); // 产品编号
                        if (ProductID != UInt16.MinValue && ProductID != theProductID) continue;

                        ManagementObjectCollection PnPEntityCollection = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE DeviceID=" + Dependent).Get();
                        if (PnPEntityCollection != null)
                        {
                            foreach (ManagementObject Entity in PnPEntityCollection)
                            {
                                Guid theClassGuid = new Guid(Entity["ClassGuid"] as String);    // 设备安装类GUID
                                if (ClassGuid != Guid.Empty && ClassGuid != theClassGuid) continue;

                                PnPEntityInfo Element;
                                Element.PNPDeviceID = Entity["PNPDeviceID"] as String;  // 设备ID
                                Element.Name = Entity["Name"] as String;                // 设备名称
                                Element.Description = Entity["Description"] as String;  // 设备描述
                                Element.Service = Entity["Service"] as String;          // 服务
                                Element.Status = Entity["Status"] as String;            // 设备状态
                                Element.VendorID = theVendorID;     // 供应商标识
                                Element.ProductID = theProductID;   // 产品编号
                                Element.ClassGuid = theClassGuid;   // 设备安装类GUID

                                UsbDevices.Add(Element);
                            }
                        }
                    }
                }
            }

            if (UsbDevices.Count == 0) return null; else return UsbDevices.ToArray();
        }

        /// <summary>
        /// 查询USB设备实体（设备要求有VID和PID）
        /// </summary>
        /// <param name="VendorID">供应商标识，MinValue忽视</param>
        /// <param name="ProductID">产品编号，MinValue忽视</param>
        /// <returns>设备列表</returns>
        public static PnPEntityInfo[] WhoUsbDevice(UInt16 VendorID, UInt16 ProductID)
        {
            return WhoUsbDevice(VendorID, ProductID, Guid.Empty);
        }

        /// <summary>
        /// 查询USB设备实体（设备要求有VID和PID）
        /// </summary>
        /// <param name="ClassGuid">设备安装类Guid，Empty忽视</param>
        /// <returns>设备列表</returns>
        public static PnPEntityInfo[] WhoUsbDevice(Guid ClassGuid)
        {
            return WhoUsbDevice(UInt16.MinValue, UInt16.MinValue, ClassGuid);
        }

        /// <summary>
        /// 查询USB设备实体（设备要求有VID和PID）
        /// </summary>
        /// <param name="PNPDeviceID">设备ID，可以是不完整信息</param>
        /// <returns>设备列表</returns>        
        public static PnPEntityInfo[] WhoUsbDevice(String PNPDeviceID)
        {
            List<PnPEntityInfo> UsbDevices = new List<PnPEntityInfo>();

            // 获取USB控制器及其相关联的设备实体
            ManagementObjectCollection USBControllerDeviceCollection = new ManagementObjectSearcher("SELECT * FROM Win32_USBControllerDevice").Get();
            if (USBControllerDeviceCollection != null)
            {
                foreach (ManagementObject USBControllerDevice in USBControllerDeviceCollection)
                {   // 获取设备实体的DeviceID
                    String Dependent = (USBControllerDevice["Dependent"] as String).Split(new Char[] { '=' })[1];
                    if (!String.IsNullOrEmpty(PNPDeviceID))
                    {   // 注意：忽视大小写
                        if (Dependent.IndexOf(PNPDeviceID, 1, PNPDeviceID.Length - 2, StringComparison.OrdinalIgnoreCase) == -1) continue;
                    }

                    // 过滤掉没有VID和PID的USB设备
                    Match match = Regex.Match(Dependent, "VID_[0-9|A-F]{4}&PID_[0-9|A-F]{4}");
                    if (match.Success)
                    {
                        ManagementObjectCollection PnPEntityCollection = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE DeviceID=" + Dependent).Get();
                        if (PnPEntityCollection != null)
                        {                            
                            foreach (ManagementObject Entity in PnPEntityCollection)
                            {
                                PnPEntityInfo Element;
                                Element.PNPDeviceID = Entity["PNPDeviceID"] as String;  // 设备ID
                                Element.Name = Entity["Name"] as String;                // 设备名称
                                Element.Description = Entity["Description"] as String;  // 设备描述
                                Element.Service = Entity["Service"] as String;          // 服务
                                Element.Status = Entity["Status"] as String;            // 设备状态
                                Element.VendorID = Convert.ToUInt16(match.Value.Substring(4, 4), 16);   // 供应商标识   
                                Element.ProductID = Convert.ToUInt16(match.Value.Substring(13, 4), 16); // 产品编号                         // 产品编号
                                Element.ClassGuid = new Guid(Entity["ClassGuid"] as String);            // 设备安装类GUID

                                UsbDevices.Add(Element);
                            }
                        }
                    }
                }
            }

            if (UsbDevices.Count == 0) return null; else return UsbDevices.ToArray();
        }

        /// <summary>
        /// 根据服务定位USB设备
        /// </summary>
        /// <param name="ServiceCollection">要查询的服务集合</param>
        /// <returns>设备列表</returns>
        public static PnPEntityInfo[] WhoUsbDevice(String[] ServiceCollection)
        {
            if (ServiceCollection == null || ServiceCollection.Length == 0)
                return WhoUsbDevice(UInt16.MinValue, UInt16.MinValue, Guid.Empty);

            List<PnPEntityInfo> UsbDevices = new List<PnPEntityInfo>();

            // 获取USB控制器及其相关联的设备实体
            ManagementObjectCollection USBControllerDeviceCollection = new ManagementObjectSearcher("SELECT * FROM Win32_USBControllerDevice").Get();
            if (USBControllerDeviceCollection != null)
            {
                foreach (ManagementObject USBControllerDevice in USBControllerDeviceCollection)
                {   // 获取设备实体的DeviceID
                    String Dependent = (USBControllerDevice["Dependent"] as String).Split(new Char[] { '=' })[1];                    

                    // 过滤掉没有VID和PID的USB设备
                    Match match = Regex.Match(Dependent, "VID_[0-9|A-F]{4}&PID_[0-9|A-F]{4}");
                    if (match.Success)
                    {
                        ManagementObjectCollection PnPEntityCollection = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE DeviceID=" + Dependent).Get();
                        if (PnPEntityCollection != null)
                        {
                            foreach (ManagementObject Entity in PnPEntityCollection)
                            {
                                String theService = Entity["Service"] as String;          // 服务
                                if (String.IsNullOrEmpty(theService)) continue;

                                foreach (String Service in ServiceCollection)
                                {   // 注意：忽视大小写
                                    if (String.Compare(theService, Service, true) != 0) continue;

                                    PnPEntityInfo Element;
                                    Element.PNPDeviceID = Entity["PNPDeviceID"] as String;  // 设备ID
                                    Element.Name = Entity["Name"] as String;                // 设备名称
                                    Element.Description = Entity["Description"] as String;  // 设备描述
                                    Element.Service = theService;                           // 服务
                                    Element.Status = Entity["Status"] as String;            // 设备状态
                                    Element.VendorID = Convert.ToUInt16(match.Value.Substring(4, 4), 16);   // 供应商标识   
                                    Element.ProductID = Convert.ToUInt16(match.Value.Substring(13, 4), 16); // 产品编号
                                    Element.ClassGuid = new Guid(Entity["ClassGuid"] as String);            // 设备安装类GUID

                                    UsbDevices.Add(Element);
                                    break;
                                }
                            }
                        }
                    }
                }
            }

            if (UsbDevices.Count == 0) return null; else return UsbDevices.ToArray();
        }
        #endregion

        #region PnPEntity
        /// <summary>
        /// 所有即插即用设备实体（过滤没有VID和PID的设备）
        /// </summary>
        public static PnPEntityInfo[] AllPnPEntities
        {
            get
            {
                return WhoPnPEntity(UInt16.MinValue, UInt16.MinValue, Guid.Empty);
            }
        }

        /// <summary>
        /// 根据VID和PID及设备安装类GUID定位即插即用设备实体
        /// </summary>
        /// <param name="VendorID">供应商标识，MinValue忽视</param>
        /// <param name="ProductID">产品编号，MinValue忽视</param>
        /// <param name="ClassGuid">设备安装类Guid，Empty忽视</param>
        /// <returns>设备列表</returns>
        /// <remarks>
        /// HID：{745a17a0-74d3-11d0-b6fe-00a0c90f57da}
        /// Imaging Device：{6bdd1fc6-810f-11d0-bec7-08002be2092f}
        /// Keyboard：{4d36e96b-e325-11ce-bfc1-08002be10318} 
        /// Mouse：{4d36e96f-e325-11ce-bfc1-08002be10318}
        /// Network Adapter：{4d36e972-e325-11ce-bfc1-08002be10318}
        /// USB：{36fc9e60-c465-11cf-8056-444553540000}
        /// </remarks>
        public static PnPEntityInfo[] WhoPnPEntity(UInt16 VendorID, UInt16 ProductID, Guid ClassGuid)
        {
            List<PnPEntityInfo> PnPEntities = new List<PnPEntityInfo>();

            // 枚举即插即用设备实体
            String VIDPID;
            if (VendorID == UInt16.MinValue)
            {
                if (ProductID == UInt16.MinValue)
                    VIDPID = "'%VID[_]____&PID[_]____%'";
                else
                    VIDPID = "'%VID[_]____&PID[_]" + ProductID.ToString("X4") + "%'";       
            }
            else
            {
                if (ProductID == UInt16.MinValue)
                    VIDPID = "'%VID[_]" + VendorID.ToString("X4") + "&PID[_]____%'";
                else
                    VIDPID = "'%VID[_]" + VendorID.ToString("X4") + "&PID[_]" + ProductID.ToString("X4") + "%'";
            }

            String QueryString;
            if (ClassGuid == Guid.Empty)
                QueryString = "SELECT * FROM Win32_PnPEntity WHERE PNPDeviceID LIKE" + VIDPID;
            else
                QueryString = "SELECT * FROM Win32_PnPEntity WHERE PNPDeviceID LIKE" + VIDPID + " AND ClassGuid='" + ClassGuid.ToString("B") + "'";

            ManagementObjectCollection PnPEntityCollection = new ManagementObjectSearcher(QueryString).Get();
            if (PnPEntityCollection != null)
            {
                foreach (ManagementObject Entity in PnPEntityCollection)
                {
                    String PNPDeviceID = Entity["PNPDeviceID"] as String;
                    Match match = Regex.Match(PNPDeviceID, "VID_[0-9|A-F]{4}&PID_[0-9|A-F]{4}");
                    if (match.Success)
                    {
                        PnPEntityInfo Element;

                        Element.PNPDeviceID = PNPDeviceID;                      // 设备ID
                        Element.Name = Entity["Name"] as String;                // 设备名称
                        Element.Description = Entity["Description"] as String;  // 设备描述
                        Element.Service = Entity["Service"] as String;          // 服务
                        Element.Status = Entity["Status"] as String;            // 设备状态
                        Element.VendorID = Convert.ToUInt16(match.Value.Substring(4, 4), 16);   // 供应商标识
                        Element.ProductID = Convert.ToUInt16(match.Value.Substring(13, 4), 16); // 产品编号
                        Element.ClassGuid = new Guid(Entity["ClassGuid"] as String);            // 设备安装类GUID

                        PnPEntities.Add(Element);
                    }
                }
            }

            if (PnPEntities.Count == 0) return null; else return PnPEntities.ToArray();
        }  
      
        /// <summary>
        /// 根据VID和PID定位即插即用设备实体
        /// </summary>
        /// <param name="VendorID">供应商标识，MinValue忽视</param>
        /// <param name="ProductID">产品编号，MinValue忽视</param>
        /// <returns>设备列表</returns>
        public static PnPEntityInfo[] WhoPnPEntity(UInt16 VendorID, UInt16 ProductID)
        {
            return WhoPnPEntity(VendorID, ProductID, Guid.Empty);
        }

        /// <summary>
        /// 根据设备安装类GUID定位即插即用设备实体
        /// </summary>
        /// <param name="ClassGuid">设备安装类Guid，Empty忽视</param>
        /// <returns>设备列表</returns>
        public static PnPEntityInfo[] WhoPnPEntity(Guid ClassGuid)
        {
            return WhoPnPEntity(UInt16.MinValue, UInt16.MinValue, ClassGuid);
        }

        /// <summary>
        /// 根据设备ID定位设备
        /// </summary>
        /// <param name="PNPDeviceID">设备ID，可以是不完整信息</param>
        /// <returns>设备列表</returns>
        /// <remarks>
        /// 注意：对于下划线，需要写成“[_]”，否则视为任意字符
        /// </remarks>
        public static PnPEntityInfo[] WhoPnPEntity(String PNPDeviceID)
        {
            List<PnPEntityInfo> PnPEntities = new List<PnPEntityInfo>();

            // 枚举即插即用设备实体
            String QueryString;
            if (String.IsNullOrEmpty(PNPDeviceID))
            {
                QueryString = "SELECT * FROM Win32_PnPEntity WHERE PNPDeviceID LIKE '%VID[_]____&PID[_]____%'";
            }
            else
            {   // LIKE子句中有反斜杠字符将会引发WQL查询异常
                QueryString = "SELECT * FROM Win32_PnPEntity WHERE PNPDeviceID LIKE '%" + PNPDeviceID.Replace('\\', '_') + "%'";
            }

            ManagementObjectCollection PnPEntityCollection = new ManagementObjectSearcher(QueryString).Get();
            if (PnPEntityCollection != null)
            {
                foreach (ManagementObject Entity in PnPEntityCollection)
                {
                    String thePNPDeviceID = Entity["PNPDeviceID"] as String;
                    Match match = Regex.Match(thePNPDeviceID, "VID_[0-9|A-F]{4}&PID_[0-9|A-F]{4}");
                    if (match.Success)
                    {
                        PnPEntityInfo Element;

                        Element.PNPDeviceID = thePNPDeviceID;                   // 设备ID
                        Element.Name = Entity["Name"] as String;                // 设备名称
                        Element.Description = Entity["Description"] as String;  // 设备描述
                        Element.Service = Entity["Service"] as String;          // 服务
                        Element.Status = Entity["Status"] as String;            // 设备状态
                        Element.VendorID = Convert.ToUInt16(match.Value.Substring(4, 4), 16);   // 供应商标识
                        Element.ProductID = Convert.ToUInt16(match.Value.Substring(13, 4), 16); // 产品编号
                        Element.ClassGuid = new Guid(Entity["ClassGuid"] as String);            // 设备安装类GUID

                        PnPEntities.Add(Element);
                    }
                }
            }

            if (PnPEntities.Count == 0) return null; else return PnPEntities.ToArray();
        }

        /// <summary>
        /// 根据服务定位设备
        /// </summary>
        /// <param name="ServiceCollection">要查询的服务集合，null忽视</param>
        /// <returns>设备列表</returns>
        /// <remarks>
        /// 跟服务相关的类：
        ///     Win32_SystemDriverPNPEntity
        ///     Win32_SystemDriver
        /// </remarks>
        public static PnPEntityInfo[] WhoPnPEntity(String[] ServiceCollection)
        {
            if (ServiceCollection == null || ServiceCollection.Length == 0)
                return WhoPnPEntity(UInt16.MinValue, UInt16.MinValue, Guid.Empty);

            List<PnPEntityInfo> PnPEntities = new List<PnPEntityInfo>();

            // 枚举即插即用设备实体
            String QueryString = "SELECT * FROM Win32_PnPEntity WHERE PNPDeviceID LIKE '%VID[_]____&PID[_]____%'";
            ManagementObjectCollection PnPEntityCollection = new ManagementObjectSearcher(QueryString).Get();
            if (PnPEntityCollection != null)
            {
                foreach (ManagementObject Entity in PnPEntityCollection)
                {
                    String PNPDeviceID = Entity["PNPDeviceID"] as String;
                    Match match = Regex.Match(PNPDeviceID, "VID_[0-9|A-F]{4}&PID_[0-9|A-F]{4}");
                    if (match.Success)
                    {
                        String theService = Entity["Service"] as String;            // 服务
                        if (String.IsNullOrEmpty(theService)) continue;

                        foreach (String Service in ServiceCollection)
                        {   // 注意：忽视大小写
                            if (String.Compare(theService, Service, true) != 0) continue;

                            PnPEntityInfo Element;

                            Element.PNPDeviceID = PNPDeviceID;                      // 设备ID
                            Element.Name = Entity["Name"] as String;                // 设备名称
                            Element.Description = Entity["Description"] as String;  // 设备描述
                            Element.Service = theService;                           // 服务
                            Element.Status = Entity["Status"] as String;            // 设备状态
                            Element.VendorID = Convert.ToUInt16(match.Value.Substring(4, 4), 16);   // 供应商标识
                            Element.ProductID = Convert.ToUInt16(match.Value.Substring(13, 4), 16); // 产品编号
                            Element.ClassGuid = new Guid(Entity["ClassGuid"] as String);            // 设备安装类GUID

                            PnPEntities.Add(Element);
                            break;
                        }
                    }
                }
            }

            if (PnPEntities.Count == 0) return null; else return PnPEntities.ToArray();
        }
        #endregion        
    }
}