powershell - 进入IF但退出到ELSE

Question

今天才刚刚开始编写脚本，但是在进入下面的脚本并选择多个“M”之前，我还未进入脚本的核心-IF语句转到“M”，但随后弹出一个窗口以显示该脚本。询问路径，我故意关闭错误窗口，直接进入else语句...

我如何让脚本结束，以便如果我选择$answer -eq "M"，那么当我退出脚本时，它将在那儿关闭，然后在该IF语句中，而不继续执行ELSE语句。

我希望以上说明是合理的-不能想到更好的解释方式。

还...我对以下陈述不满意:

while("S","M" -notcontains $answer)

问题是，如果一个人输入其他东西，就会继续弹出该问题。如果有人输入了错误的值，然后问用户“请输入“S”或“M””，我该如何出错？

码:

Write-Host ""
Write-Host "Backup Troubleshooting Script" -ForegroundColor Cyan
Write-Host ""

$answer = Read-Host "Do you want to check for multiple (M) servers or a single (S) server? Please enter "S" or "M""

while("S","M" -notcontains $answer)
{
    $answer = Read-Host "Do you want to check for multiple (M) servers or a single (S) server? Please enter "S" or "M""
}

If ($answer -eq "M")
{
    $serverlist = Read-Host "Please enter path to server list: "
    $computer = Get-Content -path $serverlist

        foreach ($computer1 in $computer)
        {
            Write-Host $computer1
            (Get-WmiObject -computerName $computer1 Win32_Service -Filter "Name='Alerter'").StopService()
            sleep 3
            (Get-WmiObject -computerName $computer1 Win32_Service -Filter "Name='Alerter'").StartService() 
            Write-Host `
        }

else
{
    Write-Host "You have chosen "S""
}
}

错误:

> Backup Troubleshooting Script
> 
> Read-Host : An error of type
> "System.Management.Automation.Host.PromptingException" has occurred.
> At
> C:\Users\gaachm5\AppData\Local\Temp\769b7304-5529-4f5c-aba7-2cd3dcc2cec9.ps1:15
> char:16
> +     $serverlist = Read-Host "Please enter path to server list: "
> +                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>     + CategoryInfo          : ResourceUnavailable: (:) [Read-Host], PromptingException
>     + FullyQualifiedErrorId : System.Management.Automation.Host.PromptingException,Microsoft.PowerShell.Commands.ReadHostC
> ommand   Get-Content : Cannot bind argument to parameter 'Path'
> because it is null. At
> C:\Users\gaachm5\AppData\Local\Temp\769b7304-5529-4f5c-aba7-2cd3dcc2cec9.ps1:16
> char:32
> +     $computer = Get-Content -path $serverlist
> +                                   ~~~~~~~~~~~
>     + CategoryInfo          : InvalidData: (:) [Get-Content], ParameterBindingValidationException
>     + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.GetContentComma
> nd   else : The term 'else' is not recognized as the name of a cmdlet,
> function, script file, or operable program. Check the  spelling of the
> name, or if a path was included, verify that the path is correct and
> try again. At
> C:\Users\gaachm5\AppData\Local\Temp\769b7304-5529-4f5c-aba7-2cd3dcc2cec9.ps1:27
> char:1
> + else
> + ~~~~
>     + CategoryInfo          : ObjectNotFound: (else:String) [], CommandNotFoundException
>     + FullyQualifiedErrorId : CommandNotFoundException
>  
> 
>     Write-Host "You have chosen "S""

Answer 1

大括号放错了位置。该代码应显示为:

            (Get-WmiObject -computerName $computer1 Win32_Service -Filter "Name='Alerter'").StartService() 
            Write-Host `
        }
}
else
{
    Write-Host "You have chosen "S""
}