Noutro dia precisei de ir ler o nome dos utilizadores na Active Directory.
Fica o resultado:

VB.NET

Imports System.DirectoryServices

Public Class teste
   Function GetLdapUserName(ByVal login As String) As String

    Dim oroot As DirectoryEntry = New DirectoryEntry("LDAP://servidor:porta/DC=xpto,DC=com", "user", "password")
    Dim osearcher As DirectorySearcher = New DirectorySearcher(oroot)
    Dim oresult As SearchResultCollection
    Dim result As SearchResult

    osearcher.Filter = "(&(cn=" + login + "))" ' filtro de procura
    osearcher.PropertiesToLoad.Add("displayName") ' propriedade a ler
    oresult = osearcher.FindAll()

    For Each result In oresult
       If Not result.GetDirectoryEntry.Properties("displayName").Value Is Nothing Then
          Return (result.GetDirectoryEntry.Properties("displayName").Value)
       End If
    Next

    Return "Não foi possivel obter o seu nome..."

 End Function
End Class



Outras propriedades que podem ser lidas na Active Directory:


  osearcher.PropertiesToLoad.Add("ou") ' organizational unit
  osearcher.PropertiesToLoad.Add("userPrincipalName") ' login name
  osearcher.PropertiesToLoad.Add("distinguishedName") ' distinguised name
  osearcher.PropertiesToLoad.Add("name") ' full name
  osearcher.PropertiesToLoad.Add("givenname") ' firstname
  osearcher.PropertiesToLoad.Add("sn") ' lastname
  osearcher.PropertiesToLoad.Add("mail") ' mail

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