string - Powershell字符串分割差异

Question

我试图通过调用 $varname.split(',') 在 PowerShell 中拆分字符串。当我在 PowerShell 控制台中时这可以正常工作，但当我直接调用脚本时则不行。

从命令提示符:powershell .\scriptname.ps1

Method invocation failed because [System.Object[]] doesn't contain a method named 'split'.
At C:\scriptname.ps1:92 char:30
+         reboot $varname.split <<<< (',')
    + CategoryInfo          : InvalidOperation: (split:String) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFound

同样，当我在 ISE 中或直接从 PS 提示符运行它时，它工作得非常好。想法？

编辑:我在下面提供了我的脚本。我对 powershell 不太熟悉，所以我没有看到任何会导致变量仅在通过命令行调用时才表现为数组的情况。

[string]$servers
[string]$filepath
[string]$account  = $([System.Security.Principal.WindowsIdentity]::GetCurrent().Name)
[string]$mode
[bool]  $reboot   = $FALSE

Write-Host "========================================"
Write-Host "| Windows Server Shutdown Utility v1.0 |"
Write-Host "========================================"

Function usage(){
    Write-Host "Arguments are accepted in any order as long as the data follows the mode."
    Write-Host "<required> [optional]"
    Write-Host "Usage: powershell .\wss.ps1 <-l|-f> <data> [-account] [-reboot] [--help]"
    Write-Host "`tModes"
    Write-Host "`t`t-list: A list of servers, seperated by commas with no spaces inbetween"
    Write-Host "`t`t`tAliases: -l"
    Write-Host "`t`t`t[*] Example: `"ServerA.domain,ServerB.domain`""
    Write-Host "`t`t-file: A path to a file that contains one server name on each line"
    Write-Host "`t`t`tAliases: -f"
    Write-Host "`t`t`t[*] Example: `"C:\allDomainServers.txt`""
    Write-Host "`taccount: The domain and account to use. You will be prompted for a password."
    Write-Host "`t`t`tAliases: -a, -ac"
    Write-Host "`treboot: If specified, the servers will be shutdown instead of rebooted."
    Write-Host "`t`t`tAliases: -r"
    Write-Host "`thelp: Prints the help screen."
    Write-Host "`t`t`tAliases: -h, -help, /help, /?"
    Write-Host "`t`tNOTE: If no account is specified, the current user will be used."

}

Function shutdown($arr){
    $arr | ForEach{
        Write-Host "Attempting to shutdown $_"
        Stop-Computer -computername ($_) -credential ($c) -force
    }
    Write-Host "Finished. Please be aware that some servers may still be in the process of shutting down."
}

Function reboot($arr){
    $arr | ForEach{
        Write-Host "Attempting to reboot $_"
        Restart-Computer -computername ($_) -credential ($c) -force
    }
    Write-Host "Finished. Please be aware that some servers may still be in the process of rebooting."
}

#Parse Arguments
if($args.length -eq 0 -or $args[0] -eq "-help" -or $args[0] -eq "/help" -or $args[0] -eq "--help" -or $args[0] -eq "/?"){
   usage
   exit
}

for($i=0; $i -lt $args.length; $i++){
    $k = $args[$i]
    if($k -eq "-r" -or $k -eq "-reboot"){
        $reboot = $TRUE
    }elseif($k -eq "-a" -or $k -eq "-ac" -or $k -eq "-account"){
        $account = $args[++$i]
    }elseif((!$mode) -and ($k -eq "-l" -or $k -eq "-list")){
        $servers = $args[++$i]
        $mode    = "list"
    }elseif((!$mode) -and ($k -eq "-f" -or $k -eq "-file")){
        $filepath = $args[++$i]
        $mode     = "file"
    }
}

#Verify Account Credentials
$c = get-credential $account

if(!$c){
    Write-Host "No credentials specified!"
    exit
}

if($mode -eq "list"){
    Write-Host "Using Mode: List"
    if([string]::IsNullOrEmpty($servers)){
        usage
        exit
    }

    if($reboot){
        reboot $servers.split(',')
    }else{
        shutdown $servers.split(',')
    }

}elseif($mode -eq "file"){
    Write-Host "Using Mode: File"
    if([string]::IsNullOrEmpty($filepath)){
        $filepath = Read-Host 'Enter the path to the file containing a list of hosts:'
    } 

    if(!(Test-Path $filepath)){
        Write-Host "Error! File doesn't exist!"
        exit
    }

    if($reboot){
        reboot (get-content $filepath)
    }else{
        shutdown (get-content $filepath)
    }

}else{
    Write-Host "Unknown Mode! Got: $mode"
    exit
}

编辑 2:使用此脚本查看进一步测试:

for($i=0; $i -lt $args.length; $i++){
    Write-Host $args[$i]
    Write-Host $args[$i].GetType()
}

Powershell提示:

PS C:\> .\test.ps1 asdf fdsa
asdf
System.String
fdsa
System.String

PS C:\> .\test.ps1 "asdf,fdas"
asdf,fdas
System.String

PS C:\> .\test.ps1 "asdf","fdas"
asdf fdas
System.Object[]

PS C:\> .\test.ps1 asdf,fdas
asdf fdas
System.Object[]

命令提示符:

C:\>powershell .\test.ps1 asdf fdsa
asdf
System.String
fdsa
System.String

C:\>powershell .\test.ps1 "asdf,fdas"
asdf fdas
System.Object[]

C:\>powershell .\test.ps1 "asdf","asdfa"
asdf asdfa
System.Object[]

C:\>powershell .\test.ps1 asdf,fdas
asdf fdas
System.Object[]

请注意它处理带引号的字符串的方式之间的差异(测试#2)。为什么会发生这种情况？有什么办法可以解决这个问题吗？

Answer 1

无论出于何种原因，当您在脚本中运行 $varname 时，它​​都会包含一个数组。并且数组上没有 Split 方法。您能否显示确定分配给 $varname 的值的脚本？顺便说一句，如果数组包含要拆分的字符串，请尝试此 $varname[0].Split(',')。