PowerShell PSObject -pass 和 -passthru 之间的混淆

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

我对 -pass 和 -passthru 键感到困惑。有什么区别，为什么当 -passthru 用于 $Items1 时什么也没有填充？

Answer 1

问题不在于 -pass 或 -passthru。问题是在函数内部创建的变量通常仅在该函数仍然运行时才可用。来自 about_Scopes 的帮助：

Windows PowerShell protects access to variables, aliases, functions, and Windows PowerShell drives (PSDrives) by limiting where they can be read and changed.

如果您通过 using dot-source 调用该函数，那么您可以保留变量以供在 New-Object 命令中使用。

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

PowerShell PSObject -pass 和 -passthru 之间的混淆

PowerShell PSObject confusion between -pass & -passthru

powershell

json

psobject