.net 如何确定AD组是否包含来自另一个（受信任）域的给定DirectoryEntry？

我正在尝试加强我的代码，以确定用户是否是给定广告组的成员。它基本上可以工作，除非组成员恰好来自另一个（受信任）域，因为它存储为foreignsecurityprincipal

鉴于我对要测试的组和要检查的帐户都有一个有效的DirectoryEntry对象，我需要一个DirectorySearcher筛选器字符串，该字符串允许我确认该帐户是否在该组中，即使该帐户是foreignsecurityprincipal

（演示问题的VB.NET代码示例）

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好的。找到了。这是诀窍

我正在尝试加强我的代码，以确定用户是否是给定广告组的成员。它基本上可以工作，除非组成员恰好来自另一个（受信任）域，因为它存储为foreignsecurityprincipal

（VB.NET代码示例）

Dim ContainerGroup as DirectoryEntry = ... Code to get Group
Dim UserToCheckFor as DirectoryEntry = ... Code to get User

DSearcher = New DirectorySearcher(ContainerGroup, "(WHATCANIPUTINHERE)", New String() {"member;Range=0-5000"}, SearchScope.Base)
DSearcher.AttributeScopeQuery = "member"

'If an object is found, the account was in the group
Return (DSearcher.FindOne() IsNot Nothing)  

Dim ContainerGroup as DirectoryEntry = ... Code to get Group
Dim UserToCheckFor as DirectoryEntry = ... Code to get User

DSearcher = New DirectorySearcher
Dim DSearcher As New DirectorySearcher(ContainerGroup, getLDAPQueryStringUsingSID(containedGroup), New String() {"member;Range=0-5000"}, SearchScope.Base)

Return (DSearcher.FindOne() IsNot Nothing) 


** Helper Methods **

Private Function getLDAPQueryStringUsingSID(ByVal DEObject As DirectoryEntry) As String            
  Return "(objectSid=" + getSDDLSidForDirectoryEntry(DEObject) + ")"
End Function

Private Function getSDDLSidForDirectoryEntry(ByVal DEObject As DirectoryEntry) As String
      Dim bytes As Byte() = CType(DEObject.Properties("objectSid").Value, Byte())
      Dim sid As New System.Security.Principal.SecurityIdentifier(bytes, 0)
      Return sid.ToString
End Function