如何从Powershell中的for each循环写入到宿主唯一结果列表？

在下面的代码中，我得到了一个重复值的列表。我试图为每一个重复的行只有一行，不同的

代码如下：

# Find DC list from Active Directory
$DCs = Get-ADDomainController -Filter *

# Define time for report (default is 1 day)
$startDate = (get-date).AddDays(-1)

# Store successful logon events from security logs with the specified dates and workstation/IP in an array
foreach ($DC in $DCs){
$slogonevents = Get-Eventlog -LogName Security -ComputerName $DC.HostName  -after $startDate -InstanceId 4624 | where {$_.ReplacementStrings[5].ToLower() -eq "administrator"}

# Crawl through events; print all logon history with type, date/time, status, account name, computer and IP address if user logged on remotely

  foreach ($e in $slogonevents){            
    if ($e.EventID -eq 4624 -and $e.ReplacementStrings[8] -In 3..10){            
      if([ipaddress]::TryParse($e.ReplacementStrings[18],[ref][ipaddress]::Loopback))
      {
        $type = $e.ReplacementStrings[8]
        $ip = $e.ReplacementStrings[18]
        $hostname=([system.net.dns]::GetHostByAddress($ip)).HostName

        write-host "Type:" $type "`tIP Address: " $ip  "`tHost Name: " $hostname             
      }
    }
  }
} Get-Unique #this does not work, also tried Unique

我得到一个类似于以下的输出

Type: 3  IP Address: 192.168.1.1 Host Name: ABCD
Type: 3  IP Address: 192.168.1.1 Host Name: ABCD
Type: 3  IP Address: 192.168.1.1 Host Name: ABCD
Type: 3  IP Address: 192.168.1.2 Host Name: EFGH
Type: 3  IP Address: 192.168.1.2 Host Name: EFGH
Type: 3  IP Address: 192.168.1.2 Host Name: EFGH
Type: 3  IP Address: 192.168.1.1 Host Name: ABCD

我想得到：

Type: 3  IP Address: 192.168.1.1 Host Name: ABCD
Type: 3  IP Address: 192.168.1.2 Host Name: EFGH

---

我认为，您没有获得唯一值的原因是您正在foreach循环中写入主机，在唯一值之前。基本上是在它知道什么是独一无二之前就把它们写出来

我要做的是创建一个PSCustomObject并在foreach中分配它。这将允许您稍后使用| Select-Unique调用它

---

正是我所寻找的，我将$report=@行移动到第一个for循环，以防与DCs重复，从而对其进行了更多的改进。您可以在回答中修复它。将其移动到ForEach中根据我的理解，您应该从GetHostByAddress$ip.HostName中删除$ip，因为在此阶段尚未创建ip变量。我更新了它，用$e.ReplacementSTrings来查找它[18]

# Find DC list from Active Directory
$DCs = Get-ADDomainController -Filter *

# Define time for report (default is 1 day)
$startDate = (get-date).AddDays(-1)

# Store successful logon events from security logs with the specified dates and workstation/IP in an array
foreach ($DC in $DCs){
$slogonevents = Get-Eventlog -LogName Security  -after $startDate -InstanceId 4624 | where {$_.ReplacementStrings[5].ToLower() -eq "administrator"}

# Crawl through events; print all logon history with type, date/time, status, account name, computer and IP address if user logged on remotely

  foreach ($e in $slogonevents){  
     $report = @() 
    if ($e.EventID -eq 4624 -and $e.ReplacementStrings[8] -In 3..10){            
      if([ipaddress]::TryParse($e.ReplacementStrings[18],[ref][ipaddress]::Loopback))
      {
        $object = New-Object PSCustomObject -Property @{
            type = $e.ReplacementStrings[8]
            ip = $e.ReplacementStrings[18]
            hostname=([system.net.dns]::GetHostByAddress($($e.ReplacementStrings[18]))).HostName        
        }
        $report += $object
      }
    }
  }
}
$report | select -Unique