如何提取Outlook显示的相同employeeID属性值？

我们公司出于各种原因使用ActiveDirectory.其中之一是处理Outlook联系人和用户登录ID.

我编写了一个程序来检测登录的用户ID,并使用提取的登录ID搜索Active Directory.然后,从Active Directory中提取的信息将存储在数据库中.

这是我用来提取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

出于某种原因,某些用户的employeeID字段没有值,有些用户也没有.

但是,所有用户在Outlook中浏览时都会显示employeeID值.

我设计了以下图片,以帮助您了解我正在经历的事情.图像分为两个部分,每个部分都有一个部分.

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在案例1中,员工使用他的ID登录到Windows:xms33808

Outlook显示他的员工ID是 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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在案例2中,员工使用ID登录Windows:25163

Outlook显示他的员工ID是 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:如何提取Outlook显示的相同employeeID值信息？