PowerShell的任务= ... Sheduler无法在可变

Question

我搜索了很长一段时间，我从来没有找到一个解决方案传递价值....

这里是我的PowerShell代码：

$TaskName = "Backup" 
$TaskDescription = "Scheduled Task for Backup." 
$GeneralServiceAccount = "SRVBK$" ## It's a gMSA https://technet.microsoft.com/en-us/library/hh831782.aspx 
$GeneralServiceAccountLogonType = "Password" 
$GeneralRunLevel = "Highest" 
$ActionScriptPath = "C:\Server\Backup\$TaskName.ps1" 
$ActionTaskProgramStart = "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" 
$ActionTaskProgramStartArgument = "-NoProfile -ExecutionPolicy Unrestricted -File $ActionScriptPath" 
$TriggerTime = "20:00" 
$TriggerFrequency = "-Daily" 


## Tab General 
$General = New-ScheduledTaskPrincipal -UserID $GeneralServiceAccount -LogonType $GeneralServiceAccountLogonType -RunLevel $GeneralRunLevel 

## Tab Trigger 
$Trigger = New-ScheduledTaskTrigger -At $TriggerTime $TriggerFrequency ## This one doesn't work 
$Trigger = New-ScheduledTaskTrigger -At 20:00 -Daily ## This one works like a charm 

## Tab Action 
$Action = New-ScheduledTaskAction -Execute $ActionTaskProgramStart -Argument $ActionTaskProgramStartArgument 

## Create the Task 
Register-ScheduledTask $TaskName –Principal $General –Trigger $Trigger –Action $Action -Description $TaskDescription 


New-ScheduledTaskTrigger : Cannot process argument transformation on parameter 'Once'. Cannot convert value "System.String" to type "System.Management.Automation.SwitchParameter". Boolean parameters accept only Boolean values and numbers, 
    such as $True, $False, 1 or 0. 
    At line:20 char:54 
    + $Trigger = New-ScheduledTaskTrigger -At $TriggerTime $TriggerFrequency ## This o ... 
    +              ~~~~~~~~~~~~~~~~~ 
     + CategoryInfo   : InvalidData: (:) [New-ScheduledTaskTrigger], ParameterBindingArgumentTransformationException 
     + FullyQualifiedErrorId : ParameterArgumentTransformationError,New-ScheduledTaskTrigger 

    Register-ScheduledTask : No mapping between account names and security IDs was done. 
    (21,8):UserId: 
    At line:26 char:1 
    + Register-ScheduledTask $TaskName –Principal $General –Trigger $Trigger –Action $ ... 
    + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
     + CategoryInfo   : NotSpecified: (PS_ScheduledTask:Root/Microsoft/...S_ScheduledTask) [Register-ScheduledTask], CimException 
     + FullyQualifiedErrorId : HRESULT 0x80070534,Register-ScheduledTask 

难道你有一个想法，因为我真的没有一个！

Answer 1

你不能只是包装参数开关在一个字符串，就像一个参数为它供给：

$TriggerFrequency = "-Daily" 
$Trigger = New-ScheduledTaskTrigger -At $TriggerTime $TriggerFrequency 

由于Once是下一个可用的位置参数，解析器会解释的最后一个命令字面上：

$Trigger = New-ScheduledTaskTrigger -At $TriggerTime -Once:"-Daily" 

---

但是，您可以包住Daily参数在哈希表中，并使用splatting提供它作为一个参数：

$TriggerFrequency = @{ Daily = $true } 
$Trigger = New-ScheduledTaskTrigger -At $TriggerTime @TriggerFrequency 

（注意在变量名称前面的@）

Answer 2

我创建使用PowerShell工具下面的代码的计划任务。究其原因，[ScriptBlock]::Create()方法是允许变量扩展，例如该代码

Param([Parameter(Mandatory=$true, 
HelpMessage="ServerName goes here")] 
[string]$server, 

[Parameter(Mandatory=$true, 
HelpMessage="Enter a Date/Time 07-28-15 16:00 For July 28th, 2015 at 4:00 PM")] 
[ValidatePattern('(?#Enter MM-dd-YY HH:MM 24hr clock)^(0[1-9]|1[012])[-](0[1-9]|[12][0-9]|3[01])[-](\d{2})\s([012]?)([0-9])[:]([])([0-9])\Z')] 
$date 
)  

#Get username and ask for password, password is encrypted. 
$user = Get-Credential -UserName $env:USERNAME -Message "UserName/password for scheduled Reboot" 
#Create job trigger at date given, in format of "03-12-16 11:11" 
$trigger = New-JobTrigger -once -at $date 
#Create script block to run PowerShell script along with a variable 
$script = [ScriptBlock]::Create("D:\Scripts\Scheduled-Reboot.ps1 -server $server") 
#Finally register the scheduled job 
Register-ScheduledJob -Name $server -Credential $user -Trigger $trigger -ScriptBlock $script 

使用方法如下：

ScheduledTask.ps1 -server MyServer -date "03-12-16 11:15" 

这将创建计划的PowerShell作业在3月12日运行"D:\Scripts\Scheduled-Reboot.ps1 -server $server"年，2016年上午11:15。