powershell比较字符串与-or

Question

我试图验证变量的值，但不管怎样，如果不使用-or

，我只能得到正确的结果

if (!$SER -eq "Y" -or  !$SER -eq "N"){
    write-host "ERROR: Wrong value for services restart" -foreground "red"
}

或者像这样

if (-not($SER -eq "Y") -or  -not($SER -eq "N")){
    write-host "ERROR: Wrong value for services restart" -foreground "red"
}

Answer 1

这有效（ne代表不等于）：

if ($SER -ne "Y" -or $SER -ne "N") {
    Write-Host "ERROR: Wrong value for services restart" -ForegroundColor Red
}

这也有效：

if ("Y", "N" -notcontains $SER) {
    Write-Host "ERROR: Wrong value for services restart" -ForegroundColor Red
}

自PowerShell v3开始：

if ($SER -notin "Y", "N") {
    Write-Host "ERROR: Wrong value for services restart" -ForegroundColor Red
}

about_Comparison_Operators (v3)

Answer 2

sodawillow provided a valid answer。但是，您可以使用-notin：

来简化此操作

if ($SER -notin 'Y', 'N') {
    Write-Host "ERROR: Wrong value for services restart" -ForegroundColor Red
}