Powershell 对象未通过管道传递给函数

Question

我有两个函数，一个创建一个自定义对象，完成后通过管道传输到下一个函数。问题是第二个函数没有正确接收我的对象。我没有使用管道，而是尝试设置一个变量，然后将该变量通过管道传递给函数。下面是两个函数，在返回的对象上有 get member 的输出。所有字符串参数都被正确处理。但是这些对象根本不起作用。在 New-BaseGuest 的 begin 块中，我无法将结果分配给变量。

基本上我想结束：

Get-ServerFromXML -XMLFile File -GuestName Name | New-BaseGuest

New-BaseGuest 函数不完整，因为我无法使参数正常工作。

TypeName: System.Management.Automation.PSCustomObject

Name             MemberType   Definition                     
----             ----------   ----------                     
Equals           Method       bool Equals(System.Object obj) 
GetHashCode      Method       int GetHashCode()              
GetType          Method       type GetType()                 
ToString         Method       string ToString()              
CDROM_Connected  NoteProperty object CDROM_Connected=null    
CDROM_ISO        NoteProperty object CDROM_ISO=null          
Floppy_Connected NoteProperty object Floppy_Connected=null   
Floppy_ISO       NoteProperty object Floppy_ISO=null         
GuestType        NoteProperty string GuestType=vmkernel6Guest
IPAddress        NoteProperty string IPAddress=192.168.199.40
ServerName       NoteProperty string ServerName=ESX-VSAN3    
vCPU             NoteProperty string vCPU=2                  
vHDD             NoteProperty Object[] vHDD=System.Object[]  
vNIC             NoteProperty Object[] vNIC=System.Object[]  
vRAM             NoteProperty string vRAM=5120   


function Get-ServerFromXML
{
 <##>

[CmdletBinding()]
param
(
    [String]
    $XMLFile,

    [String]
    $GuestName
)
$xml = New-Object -TypeName XML
$xml.Load($XMLFile)
$Server = Select-Xml -Xml $xml -XPath ('/Servers/Server[@Name = "' + $GuestName + '" ]')
$vNicObjs = @()
$vHddobjs = @()
If ($Server.Node.Hardware.vnic.Count -ne $null)
{
    $Server.Node.Hardware.vnic | %{
        $NicProps = @{
            NIC_ID = $_.ID;
            NIC_Type = $_.Type;
            NIC_StartConnected = $_.StartConnected;
            NIC_MACAddress = $_.MACAddress;
            NIC_WakeOnLan = $_.WakeOnLan;
            NIC_PortGroup = $_.PortGroup
        }
        $vNicObj = New-Object -TypeName System.Management.Automation.PSObject -Property $NicProps
        $vNicObjs += $vNicObj
    }
}
Else
{
    $NicProps = @{
        NIC_ID = $Server.Node.Hardware.vnic.ID;
        NIC_Type = $Server.Node.Hardware.vnic.Type;
        NIC_StartConnected = $Server.Node.Hardware.vnic.StartConnected;
        NIC_MACAddress = $Server.Node.Hardware.vnic.MACAddress;
        NIC_WakeOnLan = $Server.Node.Hardware.vnic.WakeOnLan;
        NIC_PortGroup = $Server.Node.Hardware.vnic.PortGroup
    }
        $vNivObj = New-Object -TypeName System.Management.Automation.PSObject -Property $NicProps
        $vNicObjs += $vNivObj
}

If ($Server.Node.Hardware.vHDD.Count -ne $null)
{
    $Server.Node.Hardware.vHDD | %{
        $HDDProps = @{
            HDD_ID = $_.ID;
            HDD_Type = $_.Type;
            HDD_Size = $Server.Node.Hardware.vHDD.Size;
            HDD_Datastore = $_.Datastore;
            HDD_StorageFormate = $_.StorageFormat
        }
        $vHDDObj = New-Object -TypeName System.Management.Automation.PSObject -Property $HDDProps
        $vHDDObjs += $vHDDObj
    }
}
Else
{
    $HDDProps = @{
        HDD_ID = $Server.Node.Hardware.vHDD.ID;
        HDD_Type = $Server.Node.Hardware.vHDD.Type;
        HDD_Size = $Server.Node.Hardware.vHDD.Size;
        HDD_DataStore = $Server.Node.Hardware.vHDD.Datastore;
        HDD_StorageFormat = $Server.Node.Hardware.vHDD.StorageFormat
    }
    $vHDDObj = New-Object -TypeName System.Management.Automation.PSObject -Property $HDDProps
    $vHDDObjs += $vHDDObj
}


$ServerProps =[Ordered]@{
    ServerName = $Server.Node.Description.Name;
    GuestType = $Server.Node.Description.GuestType;
    IPAddress = $Server.Node.Description.PrimaryIP;
    vCPU = $Server.Node.Hardware.vCPU;
    vRAM = $Server.Node.Hardware.vRAM;
    vHDD = $vHddobjs;
    vNIC = $vNicObjs;
    CDROM_ISO = $Server.Node.Hardware.CDROM.ISOPath
    CDROM_Connected = $Server.Node.Hardware.CDROM.StartConnected
    Floppy_ISO = $Server.Node.Hardware.Floppy.ISOPath
    Floppy_Connected = $Server.Node.Hardware.Floppy.StartConnected
}

$ServerObj = New-Object -TypeName System.Management.Automation.PSObject -Property $ServerProps
$ServerObj
}

function New-BaseGuest
{
 <##>

[CmdletBinding(PositionalBinding = $true,
               SupportsShouldProcess = $true)]
param
(
    [Parameter(Mandatory = $true,
               ValueFromPipeline = $false,
               ValueFromPipelineByPropertyName = $true,
               Position = 1)]
    [string]
    $ServerName,

    [Parameter(Mandatory = $true,
               ValueFromPipeline = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 2)]
    [string]
    $GuestType,

    [Parameter(Mandatory = $true,
               ValueFromPipeline = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 3)]
    [string]
    $vCPU,

    [Parameter(Mandatory = $true,
               ValueFromPipeline = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 4)]
    [string]
    $vRAM,

    [Parameter(Mandatory = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 5)]
    [system.object]
    $vHDD,

    [Parameter(Mandatory = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 6)]
    [system.object]
    $vNIC,

    [Parameter(Mandatory = $false,
               ValueFromPipeline = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 7)]
    [string]
    $CDROM_ISO = $Null,

    [Parameter(Mandatory = $false,
               ValueFromPipeline = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 8)]
    [string]
    $FLOPPY_ISO = $Null,

    [Parameter(Mandatory = $false,
               ValueFromPipeline = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 9)]
    [string]
    $CDROM_Connected = $Null,

    [Parameter(Mandatory = $true,
               ValueFromPipeline = $true,
               ValueFromPipelineByPropertyName = $true,
               Position = 10)]
    [string]
    $Floppy_Connected = $Null
)

BEGIN 
{
    $Datastore  = ($vHDD | Where-Object { $_.HDD_ID -eq 1 } | Select-Object -Property HDD_DataStore).HDD_DataStore
    $PortGroup  = ($vNIC | Where-Object { $_.NIC_ID -eq 1 } | Select-Object -Property NIC_PortGroup).NIC_PortGroup
    $DiskSize   = ($vHDD | Where-Object { $_.HDD_ID -eq 1 } | Select-Object -Property HDD_Size).HDD_Size
    $DiskFormat = ($vHDD | Where-Object { $_.HDD_ID -eq 1 } | Select-Object -Property HDD_StorageFormat).HDD_StorageFormat
}
PROCESS
{
    New-VM -Name $ServerName `
           -Datastore $Datastore `
           -NumCPU $vCPU `
           -MemoryGB $vRAM`
           -DiskGB $DiskSize `
           -NetworkName $PortGroup `
           -DiskStorageFormat $CDROM_ISO `
           -GuestID $GuestType | Out-Null
}
END
{

}
}

Answer 1

这是预期的行为。在遇到任何管道对象之前的 begin {} 块运行，因此您无法访问通过开始块中的管道传入的任何参数。

process {} 块运行每个项目一次，所以你在开始块中的代码确实需要放在那里（因为它特定于单个 VM）。

Powershell 对象未通过管道传递给函数

Powershell Object not being piped through to Functions

powershell

pipeline

pscustomobject