C#如何知道可移动磁盘是usb驱动器，还是sd卡？

Question

Windows 7平台，C#

我使用以下语句列出所有驱动器：

DriveInfo[] drives = DriveInfo.GetDrives();

然后我可以使用DriveType查找所有可移动磁盘：

foreach (var drive in drives)
{
     if(drive.DriveType == DriveType.Removable)
         yield return drive;
}

现在我的问题是，SD卡磁盘和USB闪存盘共享相同的driveType:可移动，那么我如何才能找到USB闪存盘？

谢谢!

Answer 1

您可以利用ManagementObjectSearcher来查询属于USB的磁盘驱动器，然后获取相应的单元字母，并只返回结果集中包含RootDirectory.Name的DriveInfo。

使用LINQ查询表达式的：

static IEnumerable<DriveInfo> GetUsbDevices()
{
    IEnumerable<string> usbDrivesLetters = from drive in new ManagementObjectSearcher("select * from Win32_DiskDrive WHERE InterfaceType='USB'").Get().Cast<ManagementObject>()
                                           from o in drive.GetRelated("Win32_DiskPartition").Cast<ManagementObject>()
                                           from i in o.GetRelated("Win32_LogicalDisk").Cast<ManagementObject>()
                                           select string.Format("{0}\\", i["Name"]);

    return from drive in DriveInfo.GetDrives()
           where drive.DriveType == DriveType.Removable && usbDrivesLetters.Contains(drive.RootDirectory.Name)
           select drive;
}

使用LINQ扩展方法的：

static IEnumerable<DriveInfo> GetUsbDevices()
{
    IEnumerable<string> usbDrivesLetters = new ManagementObjectSearcher("select * from Win32_DiskDrive WHERE InterfaceType='USB'").Get().Cast<ManagementObject>()
        .SelectMany(drive => drive.GetRelated("Win32_DiskPartition").Cast<ManagementObject>())
        .SelectMany(o => o.GetRelated("Win32_LogicalDisk").Cast<ManagementObject>())
        .Select(i => Convert.ToString(i["Name"]) + "\\");

    return DriveInfo.GetDrives().Where(drive => drive.DriveType == DriveType.Removable && usbDrivesLetters.Contains(drive.RootDirectory.Name));
}

使用foreach的：

static IEnumerable<string> GetUsbDrivesLetters()
{                
    foreach (ManagementObject drive in new ManagementObjectSearcher("select * from Win32_DiskDrive WHERE InterfaceType='USB'").Get())
        foreach (ManagementObject o in drive.GetRelated("Win32_DiskPartition"))
            foreach (ManagementObject i in o.GetRelated("Win32_LogicalDisk"))
                yield return string.Format("{0}\\", i["Name"]);
}

static IEnumerable<DriveInfo> GetUsbDevices()
{
    IEnumerable<string> usbDrivesLetters = GetUsbDrivesLetters();
    foreach (DriveInfo drive in DriveInfo.GetDrives())
        if (drive.DriveType == DriveType.Removable && usbDrivesLetters.Contains(drive.RootDirectory.Name))
            yield return drive;
}

要使用ManagementObject，您需要添加对System.Management的引用

我还没有很好的测试它，因为我现在没有任何SD卡，但我希望它有帮助

Answer 2

我不得不在一个旧的项目中检查USB设备，然后像这样解决它：

 Win32.DEV_BROADCAST_DEVICEINTERFACE deviceInterface;
 deviceInterface = (Win32.DEV_BROADCAST_DEVICEINTERFACE)
 string name = new string(deviceInterface.dbcc_name);
 Guid g = new Guid(deviceInterface.dbcc_classguid);
 if (g.ToString() == "a5dcbf10-6530-11d2-901f-00c04fb951ed")
 {*DO SOMETHING*}

我得到GUID并检查设备GUID是否是USB。