Question

我正在尝试编写一个powershell脚本，告诉我网络中的计算机是打开还是关闭，如果打开，是否有人登录。目前我有：

# Create some empty arraylists                                                               
$availablecomputers = New-Object System.Collections.ArrayList
$unavailablecomputers = New-Object System.Collections.ArrayList
$usersloggedon = New-Object System.Collections.ArrayList

#Check connectivity for each machine via Test-WSMan
foreach ($computer in $restartcomputerlist)
{
    try 
    {
    Test-WSMan -ComputerName $computer -ErrorAction Stop |out-null
    Invoke-Command `
    -ComputerName  $computer `
    -ScriptBlock `
    {
        if
        ((Get-WmiObject win32_computersystem).username -like "AD\*")
        {
            $args[0] += $computer
        }
        else 
        {
            $args[1] += $computer
        }
    } `
    -ArgumentList (,$usersloggedon), (,$availablecomputers)
    }
    catch 
    {
    $unavailablecomputers += $computer 
    }
}

到目前为止，如果计算机未开启，则可正常工作。但是，如果它打开，$ computer将不会被添加到$ usersloggedon或$ availablecomputers。任何帮助将不胜感激。

Answer 1

@Mathias是正确的;传递给scriptblock的变量按值（序列化）传递，而不是通过引用传递，因此您无法更新它们并更改原始对象。

要从scriptblock返回值，请使用Write-Object或只是简单地使用＆＃34;使用＆＃34;值{Write-Object $env:COMPUTERNAME与刚才$env:COMPUTERNAME}相同。

针对您的具体情况，请考虑返回包含所需信息的对象：

$computers = @()

#Check connectivity for each machine via Test-WSMan
foreach ($computer in $restartcomputerlist)
{
    try 
    {
    Test-WSMan -ComputerName $computer -ErrorAction Stop |out-null
    $computers += Invoke-Command -ComputerName $computer -ScriptBlock {
        $props = @{
            Name = $env:COMPUTERNAME
            Available = $true
            UsersLoggedOn = ((Get-WmiObject win32_computersystem).username -like "AD\*")
        }
        New-Object PSObject -Property $props
    }
    }
    catch 
    {
    $props = @{
        Name = $computer
        Available = $false
        UsersLoggedOn = $false
    }
    $computers += New-Object PSObject -Property $props 
    }
}
$computers # You can now use this with Select-Object, Sort-Object, Format-* etc.

Powershell - 将多个arraylists传递给Invoke-Command块

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