Con la Class WindowsIdentity no vas a conseguir nada, el método GetCurrent devuelve el usuario local, y debes conocer el nombre del usuario (o el UPN si no formas parte de un dominio) para identificar un usuario usando el Constructor de dicha Class.
Aparte de eso, un FilesystemWatcher no recibe ni devuelve ningún tipo de información sobre el usuario en cuestión, según parece es una tarea bastante compleja de llevar a cabo, tienes mucha información sobre esto en los resultados de Google:
NTFS doesn't track who deletes, renames, or modifies a file, so there's no way you can get the username. It only keeps track of who OWNS the file.
No, it's not possible, the NTFS or FAT file system which is what Windows uses doesn't record this information. The best you could get about a file is last time it was changed.
First off, you'll need to devise some way of determining whether the changes to a file were made locally or remotely
The only possibilities I can think of would be the NetFileEnum and NetFileGetInfo API function calls
This isn't currently possible with the current implementations of the FileSystemWatcher as it does not receive this type of information when a file is deleted, or anything about a file changes.
You would need to use Win32 API calls, if it's possible at all. I'm not sure which APIs you would need to use,
but you will end up essentially writing your own version of a file system watcher
La información de la función
NetFileGetInfo es muy escasa así que no puedo mostrarte un ejemplo funcional (tampoco se si funcionaría, solo especulan por internet).
(
http://msdn.microsoft.com/en-us/library/windows/desktop/bb525379%28v=vs.85%29.aspx )
Puedes probar la siguiente solución
(ya no recuerdo de donde obtuve el código) sacada de:
http://stackoverflow.com/questions/11660235/find-out-usernamewho-modified-file-in-c-sharp, pero personalmente y al menos en Windows 8.1 a mi me devuelve el grupo de usuarios (Administradores), no el usuario (Administrador).
La versión en VB.NET
Imports System.Text
Imports System.IO
Public Class Form1
Private Function GetSpecificFileProperties
(file As String,
ParamArray indexes
As Integer()) As String
Dim fileName
As String = Path.
GetFileName(file) Dim folderName
As String = Path.
GetDirectoryName(file) Dim shell As New Shell32.Shell()
Dim objFolder
As Shell32.
Folder objFolder = shell.[NameSpace](folderName)
Dim sb As New StringBuilder()
For Each item As Shell32.FolderItem2 In objFolder.Items()
If fileName = item.Name Then
For i As Integer = 0 To indexes.Length - 1
sb.Append(objFolder.GetDetailsOf(item, indexes(i)) + ",")
Next
Exit For
End If
Next
Dim result As String = sb.ToString().Trim()
If result.Length = 0 Then
Return String.Empty
End If
Return result.Substring(0, result.Length - 1)
End Function
Private Sub FileSystemWatcher1_Changed(sender As Object, e As FileSystemEventArgs) _
Handles FileSystemWatcher1.Changed, FileSystemWatcher1.Created
Dim filepath As String = e.FullPath
Dim Type As String = GetSpecificFileProperties(filepath, 2)
Dim ObjectKind As String = GetSpecificFileProperties(filepath, 11)
Dim CreatedDate As DateTime = Convert.ToDateTime(GetSpecificFileProperties(filepath, 4))
Dim LastModifiedDate As DateTime = Convert.ToDateTime(GetSpecificFileProperties(filepath, 3))
Dim LastAccessDate As DateTime = Convert.ToDateTime(GetSpecificFileProperties(filepath, 5))
Dim LastUser As String = GetSpecificFileProperties(filepath, 10)
Dim ComputerName As String = GetSpecificFileProperties(filepath, 53)
Dim FileSize As String = GetSpecificFileProperties(filepath, 1)
Debug.
WriteLine(LastUser
) Debug.
WriteLine(ComputerName
)
End Sub
End Class
Esta parece ser una solución, aunque personalmente no la he consguido hacer funcionar:
http://vbcity.com/forums/p/133307/698930.aspx#698930+
Use code posted by dave4dl and update declare struct FILE_INFO_3 as following, you can monitor user name of create and update file action(It is like to combination of FileSystemWatcher and OpenFiles.exe's functions of FileSharing Server)
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct FILE_INFO_3
{
public int fi3_id;
public int fi3_permission;
public int fi3_num_locks;
[MarshalAs(UnmanagedType.LPWStr)]
public string fi3_pathname;
[MarshalAs(UnmanagedType.LPWStr)]
public string fi3_username;
}
Saludos.
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