-pass和-passthru之间的PowerShell PSObject混淆

Question

function getinfo {
    $strComputer = "localhost"
    $colItems = GWMI -cl "Win32_NetworkAdapterConfiguration" -name "root\CimV2" -comp $strComputer -filter "IpEnabled = TRUE"
    $Items1 = $colItems | Select DHCPServer, Caption, DNSHostName, IPAddress
    $Items2 = $colItems | Select ServiceName, MacAddress, IPSubnet, InterfaceIndex
}
$objects = (New-Object PSObject |
               add-member -pass NoteProperty "DHCP Server" $Items1.DHCPServer |
               add-member -pass NoteProperty "IP Address" $Items1.IPAddress | 
               add-member -passthru NoteProperty "Mac Address" $Items2.MacAddress | 
               add-member -passthru NoteProperty "IP Subnet" $Items2.IPSubnet
                )
$objects | ConvertTo-Json

我感到困惑的-pass ＆ -passthru键。 有什么区别，为什么-passthru用于$Items1时为什么没有填充？

Answer 1

这个问题是不是-pass或-passthru 。 问题在于，在函数内部创建的变量通常仅在该函数仍在运行时才可用。 从about_Scopes的帮助中：

Windows PowerShell通过限制可以读取和更改的位置来保护对变量，别名，函数和Windows PowerShell驱动器（PSDrives）的访问。

如果使用点源调用函数，则可以使变量在New-Object命令中可用。

function getinfo {
    $strComputer = "localhost"
    $colItems = GWMI -cl "Win32_NetworkAdapterConfiguration" -name "root\CimV2" -comp $strComputer -filter "IpEnabled = TRUE"
    $Items1 = $colItems | Select DHCPServer, Caption, DNSHostName, IPAddress
    $Items2 = $colItems | Select ServiceName, MacAddress, IPSubnet, InterfaceIndex
}
. getinfo
$objects = (New-Object PSObject |
               add-member -pass NoteProperty "DHCP Server" $Items1.DHCPServer |
               add-member -pass NoteProperty "IP Address" $Items1.IPAddress | 
               add-member -passthru NoteProperty "Mac Address" $Items2.MacAddress | 
               add-member -passthru NoteProperty "IP Subnet" $Items2.IPSubnet
                )
$objects | ConvertTo-Json