powershell - 变量是数组而不是字符串？

Question

我写了这个小脚本，当我测试Write-Host $serial时看起来不错，但是当它在后台运行时$serial似乎包含一个数组。

它尝试将计算机重命名为C000@{SerialNumber=F7ZL3F2}而不是C000F7ZL3F2。

我应该怎么做才能得到字符串而不是这个数组？

Import-Module ActiveDirectory
Get-ADComputer -Filter {Name -like 'DESKTOP-*'} -Properties * | Select Name, DNSHostName | ForEach-Object {
    $rtn = Test-Connection -CN $_.dnshostname -Count 1 -BufferSize 16 -Quiet
    if ($rtn -match 'True') { 
        $serial = Get-WMIObject Win32_Bios -ComputerName $_.name | Select-String SerialNumber
        $serial = "C000$serial"
        // Write-Host $serial
        Rename-Computer -ComputerName $_.name -NewName $serial -DomainCredential $mycreds -Force -Restart
    }
}

Answer 1

您的代码中要指出两个错误-

$serial = Get-WMIObject Win32_Bios -ComputerName $_.name | Select-String SerialNumber
Select-String cmdlet在输入字符串和文件中搜索文本和文本模式。其中Get-WMIObject Win32_Bios的基本类型输出是System.Management.ManagementBaseObject

(Get-WMIObject Win32_Bios).Gettype()IsPublic IsSerial Name             BaseType-------- -------- ----             --------True     True     ManagementObject System.Management.ManagementBaseObject

In such cases, instead of Select-String, you can use Select-Object to choose amongst the properties. Since, Serial Number is one of the properties returned by your input command.

$serial = "C000$serial"

The output of $serial will be something like this:

SerialNumber
   
5CXXXXYYYXZZZ

Again, you can call it directly by $serial.SerialNumber. So your overall code will be

Import-Module ActiveDirectory

Get-ADComputer -Filter {Name -like 'DESKTOP-*'} -Properties * | Select Name, DNSHostName | ForEach-Object {
    $rtn = Test-Connection -CN $_.dnshostname -Count 1 -BufferSize 16 -Quiet

    if ($rtn -match 'True') { 
        $serial = Get-WMIObject Win32_Bios -ComputerName $_.name |
                  Select-Object SerialNumber

        $serial = "C000$($serial.SerialNumber)"

        Rename-Computer -ComputerName $_.name -NewName $serial -DomainCredential $mycreds -Force -Restart
    }
}

或者您可以使用-ExpandProperty cmdlet的Select-Object参数，例如

$serial = Get-WMIObject Win32_Bios -ComputerName $_.name |
          Select-Object -ExpandProperty SerialNumber
$serial = "C000$serial"