如何獲取文件夾的NTFS文件ID

Question

如何獲取c＃中文件夾的唯一NTFS文件ID？

Answer 1

internal static Int64 GetDirectoryId(string dir) 
    { 
     var handle = CreateFile(dir, FileAccess.Read, FileShare.Read, IntPtr.Zero, FileMode.Open, 0x02000000 | 0x00000080, IntPtr.Zero); 
     var fileStruct = new FILE_ID_BOTH_DIR_INFO(); 
     GetFileInformationByHandleEx(handle, FILE_INFO_BY_HANDLE_CLASS.FileIdBothDirectoryInfo, out fileStruct, (uint)Marshal.SizeOf(fileStruct)); 
     CloseHandle(handle); 
     var win32Error = Marshal.GetLastWin32Error(); 
     if (win32Error != 0) 
      throw new Win32Exception(); 

     return fileStruct.FileId.QuadPart; 
    } 

    [DllImport("kernel32.dll", SetLastError = true)] 
    private static extern bool GetFileInformationByHandleEx(
     IntPtr hFile, 
     FILE_INFO_BY_HANDLE_CLASS infoClass, 
     out FILE_ID_BOTH_DIR_INFO dirInfo, 
     uint dwBufferSize); 

    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] 
    private static extern IntPtr CloseHandle(
     IntPtr handle); 

    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] 
    private static extern IntPtr CreateFile(
     string lpFileName, 
     [MarshalAs(UnmanagedType.U4)] FileAccess dwDesiredAccess, 
     [MarshalAs(UnmanagedType.U4)] FileShare dwShareMode, 
     IntPtr lpSecurityAttributes, 
     [MarshalAs(UnmanagedType.U4)] FileMode dwCreationDisposition, 
     uint dwFlagsAndAttributes, 
     IntPtr hTemplateFile); 

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] 
    private struct FILE_ID_BOTH_DIR_INFO 
    { 
     public uint NextEntryOffset; 
     public uint FileIndex; 
     public LARGE_INTEGER CreationTime; 
     public LARGE_INTEGER LastAccessTime; 
     public LARGE_INTEGER LastWriteTime; 
     public LARGE_INTEGER ChangeTime; 
     public LARGE_INTEGER EndOfFile; 
     public LARGE_INTEGER AllocationSize; 
     public uint FileAttributes; 
     public uint FileNameLength; 
     public uint EaSize; 
     public char ShortNameLength; 
     [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 12)] 
     public string ShortName; 
     public LARGE_INTEGER FileId; 
     [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 1)] 
     public string FileName; 
    } 

    [StructLayout(LayoutKind.Explicit, Size=8)] 
    private struct LARGE_INTEGER 
    { 
     [FieldOffset(0)]public Int64 QuadPart; 
     [FieldOffset(0)]public UInt32 LowPart; 
     [FieldOffset(4)]public Int32 HighPart; 
    } 

    private enum FILE_INFO_BY_HANDLE_CLASS 
    { 
     FileIdBothDirectoryInfo = 10 
    }