递归函数在写入主机和在数组中保存时有不同的结果。

Question

我对递归函数有一个问题，该函数递归地获取组的所有父组。

我的功能是这样的

function Get-ADPrincipalGroupMembershipRecursive ($groupName,$list)
{
  $groupsMembership = Get-ADPrincipalGroupMembership $groupName

  foreach ($groupMembership in $groupsMembership)
  {
    write-host $groupMembership.name
    $list += $groupMembership.name
    Get-ADPrincipalGroupMembershipRecursive -groupName 
    $groupMembership -list $list
  }

  return $list
}

当我调用我的函数时，我希望在控制台和响应列表时得到相同的输出。但是写主机写的东西是正确的，但是在列表中我得到了重复的条目。

在这里，我如何使用我的功能和测试

$groupsParent = @()
$groupsParent = Get-ADPrincipalGroupMembershipRecursive -groupName "g-assistants" -list $groupsParent
write-host "Length" $groupsParent.Length
$groupsParent

我得到以下输出

G-eGR
G-ePA
G-eRPP
G-ePO
HP-Designjet-Z6800ps
G-scan313
Length 27
G-eGR
G-eGR
G-ePA
G-eGR
G-ePA
G-eRPP
G-eGR
G-ePA
G-eRPP
G-ePO    
G-eGR
G-ePA
G-eRPP
G-ePO
HP-Designjet-Z6800ps
G-eGR
G-ePA
G-eRPP
G-ePO
HP-Designjet-Z6800ps
G-scan313
G-eGR
G-ePA
G-eRPP
G-ePO
HP-Designjet-Z6800ps
G-scan313

以这个示例组为例，组g-assistants在G-eGR G-ePA G-eRPP G-ePO HP-Designjet-Z6800ps G-scan313中。

Answer 1

您在输出中得到重复的条目，因为您在每次调用中都传递$list；在每次迭代中，您都会更新并发送它。

您应该从递归函数中输出有关它处理的组的信息，在调用函数中，您应该获取该输出并将其添加到列表中。

我对你的脚本做了这些修改：

function Get-ADPrincipalGroupMembershipRecursive ($groupName)
{
  # Empty list. The current function call knows nothing about who called it
  $list = @()

  # Add the current group to the list
  $list += $groupName

  Write-Host $groupName 

  $groupsMembership = Get-ADPrincipalGroupMembership $groupName

  foreach ($groupMembership in $groupsMembership.Name)
  {
    # Add all child groups to the list
    $list += Get-ADPrincipalGroupMembershipRecursive -groupName $groupMembership
  }

  # Return the current group and all its children
  return  $list
}

$groupsParent = Get-ADPrincipalGroupMembershipRecursive -groupName $groupName
write-host "Length" $groupsParent.Length
$groupsParent

希望它有帮助:)