从驱动器号获取卷标(不是驱动器号)

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern bool GetVolumeInformation(string lpRootPathName,
        IntPtr lpVolumeNameBuffer, uint nVolumeNameSize,
        out uint lpVolumeSerialNumber, out uint lpMaximumComponentLength,
        out uint lpFileSystemFlags, IntPtr lpFileSystemNameBuffer,
        uint nFileSystemNameSize);

    static void Main()
    {
        string driveRoot = "C:\\";  // 驱动器号

        StringBuilder volumeNameBuffer = new StringBuilder(256);
        uint volumeSerialNumber;
        uint maximumComponentLength;
        uint fileSystemFlags;
        StringBuilder fileSystemNameBuffer = new StringBuilder(256);

        bool result = GetVolumeInformation(driveRoot, volumeNameBuffer,
            (uint)volumeNameBuffer.Capacity, out volumeSerialNumber,
            out maximumComponentLength, out fileSystemFlags,
            fileSystemNameBuffer, (uint)fileSystemNameBuffer.Capacity);

        if (result)
        {
            string volumeLabel = volumeNameBuffer.ToString();
            Console.WriteLine("驱动器号 {0} 的卷标为：{1}", driveRoot, volumeLabel);
        }
        else
        {
            Console.WriteLine("无法获取驱动器号 {0} 的卷标。错误码：{1}",
                driveRoot, Marshal.GetLastWin32Error());
        }
    }
}