在嵌套ToString属性上重载PSObject问题

Question

我已经创建了一个具有各种属性的自定义PSObject，并且我试图为其中的一些属性重载ToString。我已经成功地使用了一个TimeSpan属性，但没有成功地使用一个WMI对象。

# Get WMI info
$wmiOS = Get-WmiObject -Class Win32_OperatingSystem
$wmiSystem = Get-WmiObject -Class Win32_ComputerSystem
$wmiDrives = Get-WmiObject -Class Win32_LogicalDisk -Filter "DriveType='3'"
$ipv4Address = (Test-Connection -ComputerName $env:COMPUTERNAME -Count 1).IPV4Address.IPAddressToString
$uptime = (Get-Date) - ($wmiOS.ConvertToDateTime($wmiOS.LastBootUpTime))
# Setup object
$result = New-Object -TypeName psobject -Property @{
    Hostname = $($wmiSystem.Name)
    Domain = $($wmiSystem.Domain)
    Username = $($wmiSystem.Username)
    OperatingSystem = $($wmiOS.Caption)
    OSArchitecture = $($wmiOS.OSArchitecture)
    PSVersion = "$($PSVersionTable.PSVersion.Major).$($PSVersionTable.PSVersion.Minor)"
    IPv4Address = $ipv4Address
    Uptime = $uptime
    DriveInfo = $wmiDrives
}

# Overload DriveInfo ToString
$result.DriveInfo = $result.DriveInfo | Add-Member -MemberType ScriptMethod -Name ToString -Value {
    "$($this.DeviceID) $($this.FreeSpace) GB;"
} -Force -PassThru

# Overload Uptime ToString 
$result.Uptime = $result.Uptime | Add-Member -MemberType ScriptMethod -Name ToString -Value {
    "$($this.Days) days, $($this.Hours) hours, $($this.Minutes) minutes, $($this.Seconds) seconds"
} -Force -PassThru

# Overload result ToString
$result = $result | Add-Member -MemberType ScriptMethod -Name ToString -Value {
    $temp = @"
Hostname: $($this.Hostname)
Domain: $($this.Domain)
Console User: $($this.Username)
Operating System: $($this.OperatingSystem)
OS Architecture: $($this.OSArchitecture)
PS Version: $($this.PSVersion)
IPv4 Address: $($this.IPv4Address)
Uptime: $($this.Uptime.ToString())
Free Space: $($this.DriveInfo)
"@
        $temp
    } -Force -PassThru

除了DriveInfo过载之外，一切看起来都很好。我只是得到了"System.Object[]“作为回报。令我感到奇怪的是，当我只执行$result.ToString()时，会得到以下内容(请参阅“空闲空间”)：

Domain: domain.local
Console User: domain\username
Operating System: Microsoft Windows 10 Pro
OS Architecture: 64-bit
PS Version: 5.1
IPv4 Address: 1.1.1.1
Uptime: 2 days, 1 hours, 31 minutes, 49 seconds
Free Space: C: 58721181696; E: 631496687616;

$result.Uptime.ToString()：

2 days, 1 hours, 19 minutes, 34 seconds

$result.DriveInfo.ToString()：

System.Object[]

我可能遗漏了一些显而易见的东西，但我在这一点上迷失了方向。感谢您能提前提供的任何帮助！

Answer 1

你能不能试着替换：

$result.DriveInfo = $result.DriveInfo | Add-Member -MemberType ScriptMethod -Name ToString -Value {"$($this.DeviceID) $($this.FreeSpace) GB;"} -Force -PassThru

通过

$result.DriveInfo | Add-Member -MemberType ScriptMethod -Name ToString -Value {"$($this.DeviceID) $($this.FreeSpace) GB;"} -Force -PassThru

根据我的理解，Add-Member应用于每个驱动器，您不需要影响结果，因为您更改了列表中的每个对象。之后，您可以使用以下方法进行测试：

$n = 0
$result.DriveInfo[$n].ToString()