PowerShell If语句比较失效：为何两变量看似相等却不匹配

云上老周

2026-8-22

问题原因与解决方法

问题根源

$temp1 是字符串类型，值为 "@{Dhcp=Disabled}"
$temp2 是Select-Object返回的PSCustomObject自定义对象，你看到的输出是该对象默认ToString()方法生成的字符串，但变量本身是对象，不是字符串。两种不同类型的变量直接用-eq比较，结果必然不相等。

解决方法

方法1：直接获取属性值（推荐）

不要用Select Dhcp返回包含属性的对象，而是用-ExpandProperty参数直接提取Dhcp属性的具体值，让$temp2和$temp1（修改为对应属性值）类型一致：

$temp1 = "Disabled"
$temp2 = Get-NetIPInterface My_Ethernet | Select-Object -ExpandProperty Dhcp

Write-Host ""
Write-Host "1" $temp1
Write-Host "2" $temp2
Write-Host ""

if ($temp2 -eq $temp1) {
    Write-Host "IP address is Static "
}
Else {
    Write-Host "IP address is Not Static"
}

方法2：将对象转为字符串后比较

如果一定要保留$temp1的原始字符串格式，可以把$temp2对象转为字符串再进行比较：

$temp1 = "@{Dhcp=Disabled}"
$temp2 = Get-NetIPInterface My_Ethernet | Select-Object Dhcp

Write-Host ""
Write-Host "1" $temp1
Write-Host "2" $temp2
Write-Host ""

if ($temp2.ToString() -eq $temp1) {
    Write-Host "IP address is Static "
}
Else {
    Write-Host "IP address is Not Static"
}