如何简化含多组连续匹配项的PowerShell switch语句

PowerShell里可以用**范围运算符..**生成连续数字，配合字符串格式化快速创建你需要的PC名称列表，不用手动逐个输入。

核心方法说明 #

• 生成连续数字：1..9会输出1到9的整数序列，10..19对应10到19，以此类推
• 格式化带前导零的字符串："{0:D3}" -f $数字可把数字转成三位带前导零的格式（比如1→"001"，10→"010"）
• 拼接前缀：将"pc"和格式化后的字符串拼接，得到完整PC名称

简化后的Switch代码 #

# 预先生成各楼层的PC名称集合
$floor1PCs = 1..9 + 20..29 | ForEach-Object { "pc{0:D3}" -f $_ }
$floor2PCs = 10..19 | ForEach-Object { "pc{0:D3}" -f $_ }

switch ($env:COMPUTERNAME) {
    { $_ -in $floor1PCs } {
        Write-Output 'These PC are located at the 1st floor.'
        break
    }
    { $_ -in $floor2PCs } {
        Write-Output 'These PC are located at the 2nd floor.'
        break
    }
    default {
        Write-Output 'Unknown location.'
        break
    }
}

紧凑写法（直接在条件中生成） #

如果不想单独定义变量，也可以把生成逻辑直接嵌入Switch条件块：

switch ($env:COMPUTERNAME) {
    { $_ -in (1..9 + 20..29 | ForEach-Object { "pc{0:D3}" -f $_ }) } {
        Write-Output 'These PC are located at the 1st floor.'
        break
    }
    { $_ -in (10..19 | ForEach-Object { "pc{0:D3}" -f $_ }) } {
        Write-Output 'These PC are located at the 2nd floor.'
        break
    }
    default {
        Write-Output 'Unknown location.'
        break
    }
}

后续调整PC范围时，只需修改数字区间即可，不用手动添加大量字符串，维护更便捷。

内容的提问来源于stack exchange，提问作者Livy