PowerShell脚本if语句逻辑异常：网卡状态判断错误

问题现象 #

实际有一块网卡处于Disabled状态，但脚本仍输出正常提示，未进入预期的警告分支。

网卡实际状态 #

Get-NetAdapter

Name                      InterfaceDescription                    ifIndex Status       MacAddress             LinkSpeed
----                      --------------------                    ------- ------       ----------             ---------
Embedded FlexibleLOM ...2 HPE FlexFabric 10Gb 4-port 536FLR-...#2      10 Disabled     08-xxx-62        10 Gbps
Embedded FlexibleLOM ...1 HPE FlexFabric 10Gb 4-port 536FLR-...#4      11 Up           08-xxx-60        10 Gbps

原脚本代码 #

$vmswitch1stinterface = (Get-VMSwitchTeam -Name "Teaming").NetAdapterInterfaceDescription|select -first 1
$vmswitch2ndinterface = (Get-VMSwitchTeam -Name "Teaming").NetAdapterInterfaceDescription|select -last 1
$1stinterfacestatus = Get-NetAdapter -InterfaceDescription $vmswitch1stinterface|select Status
$2ndinterfacestatus = Get-NetAdapter -InterfaceDescription $vmswitch2ndinterface|select Status
if (($1stinterfacestatus -and $2ndinterfacestatus) -eq 'up') 
{
    Write-Host "OK: NIC ports are up (VMSwitch)"
    Exit 0
}   else 
{
    Write-Host "WARNING: An interface is down! Please check in the list which one is not UP:" 
    Get-NetAdapter -InterfaceDescription $vmswitch1stinterface|Select-Object InterfaceDescription, Status
    Get-NetAdapter -InterfaceDescription $vmswitch2ndinterface|Select-Object InterfaceDescription, Status
    Exit 1
}

变量实际值 #

$vmswitch1stinterface: HPE FlexFabric 10Gb 4-port 536FLR-T Adapter #4
$vmswitch2ndinterface: HPE FlexFabric 10Gb 4-port 536FLR-T Adapter #2

$1stinterfacestatus
Status
------
Up

$2ndinterfacestatus
Status
------
Disabled

错误输出 #

OK: NIC ports are up (VMSwitch)

核心逻辑疏漏 #

1. 对象与字符串混淆 #

$1stinterfacestatus和$2ndinterfacestatus是通过Select Status得到的自定义对象，不是直接的状态字符串。直接用对象参与比较时，PowerShell不会自动提取Status属性值进行判断。

2. 逻辑判断语法完全错误 #

原判断条件($1stinterfacestatus -and $2ndinterfacestatus) -eq 'up'存在两个致命问题：

• -and在这里是对两个对象做布尔判断：只要对象非空就返回$true，所以无论网卡状态是什么，$1stinterfacestatus -and $2ndinterfacestatus的结果都是$true。
• $true -eq 'up'会触发PowerShell的类型隐式转换：字符串'up'会被转为布尔值$true，最终整个条件判断结果为$true，导致脚本错误地进入正常分支。

修正后的脚本 #

# 一次性获取交换机组的所有网卡描述，避免重复调用Get-VMSwitchTeam
$vmSwitchAdapters = (Get-VMSwitchTeam -Name "Teaming").NetAdapterInterfaceDescription

# 获取每个网卡的实际状态（直接提取Status属性的字符串值）
$adapterStatuses = $vmSwitchAdapters | ForEach-Object {
    (Get-NetAdapter -InterfaceDescription $_).Status
}

# 判断所有网卡是否都处于Up状态
if ($adapterStatuses -notcontains 'Disabled' -and $adapterStatuses -notcontains 'Down') {
    Write-Host "OK: NIC ports are up (VMSwitch)"
    Exit 0
}
else {
    Write-Host "WARNING: An interface is down! Please check the list below:"
    Get-NetAdapter -InterfaceDescription $vmSwitchAdapters | Select-Object InterfaceDescription, Status
    Exit 1
}

修正要点 #

• 直接提取Status属性值：用(Get-NetAdapter ...).Status替代Select Status，得到纯字符串的状态值，确保比较逻辑有效。
• 简化代码逻辑：一次性获取所有网卡描述，批量处理状态，避免重复操作。
• 严谨的状态判断：检查所有网卡状态是否不包含Disabled和Down，覆盖所有异常状态场景。

内容的提问来源于stack exchange，提问作者Badb0y