asp.net – 如何提取与Outlook正在显示的employeeID属性值相同？

我写了一个程序来检测登录的用户标识,并使用提取的登录ID搜索Active Directory.然后将来自Active Directory的拉出的信息存储在数据库中.

以下是我用于拉取ActiveDirectory信息数据的代码：

Dim enTry As DirectoryEntry = _
     New DirectoryEntry("LDAP://myCOMPANY/DC=myCOMPANY,DC=myCOMPANY,DC=com")

Dim mySearcher As DirectorySearcher = New DirectorySearcher(enTry)
mySearcher.Filter = "(&(objectClass=user)(anr=" & thisUser & "))" 
'thisUser is the variable holding the Windows ID that is accessing the ASPX page


mySearcher.PropertiesToLoad.Add("employeeID")   'just in case I need to do this.

Dim resEnt As SearchResult

Try
  For Each resEnt In mySearcher.FindAll()

  Dim fullname As String = resEnt.GetDirectoryEntry.Properties.Item("cn").Value
  'fullname will always pull the right information

  Dim e_id As String = resEnt.GetDirectoryEntry.Properties.Item("employeeID").Value
  'e_id will sometimes be NOTHING,sometimes will contain an ID that
  '   is different from the one displayed in Outlook Contact Information
  '   and sometimes it will be matching the employeeID listed in Outlook info

Catch ex as Exception
  Log("Failed to pull AD data: " & ex.Message)
End Try

由于某些原因,一些用户对于employeeID字段没有任何值,有些用户没有.

但是,在Outlook中浏览时,所有用户都将显示employeeID值.

我设计了以下图像来帮助您了解我正在经历的事情.
图像分为两个部分,每个CASE的一个部分.

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在案例1中,员工已使用他的ID：xms33808登录到Windows

Outlook显示他的员工ID为16078

Outlook显示他的电子邮件别名是xms33808

ASP.Net命令窗口显示他的employeeID是xms33808,这不是真的

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在情况2中,员工已使用ID：25163登录Windows

Outlook显示他的员工ID为25163

Outlook显示他的电子邮件别名是MutawaAAB

ASP.Net命令窗口显示他的employeeID是NOTHING.

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我的问题是：如何解压缩Outlook显示的相同的employeeID值信息？