将字符串 $variable 传递给调用命令脚本块参数 -name [英] Passing string $variable to invoke-command scriptblock parameter -name

问题描述

我目前正在编写一个相对简单的 PowerShell 脚本来重新启动/停止/启动远程计算机上的服务.一切正常，直到我决定将 $Service 变量传递给 Invoke-Command Scriptblock 中的 -Name 参数.我知道我做错了什么或忘记了什么，但您的帮助将不胜感激.这是突出显示问题的部分代码

I'm currently writing a relatively easy PowerShell script to restart/stop/start a service on a remote machine. Everything is working well up until I decide to pass a $Service variable to -Name parameter in the Invoke-Command Scriptblock. I know I'm doing something wrong or forgetting something but your help would be greatly appreciated. Here is the code with the part giving me problems highlighted

[CmdletBinding()] Param([Parameter(Mandatory=$True,Position=1)]
  [string]$Server,
  [Parameter(Mandatory=$True)]
  [string]$Service) 
get-service -ComputerName $Server -Name "$Service"

Write-Host("------------------------------------------------")
Write-Host("Execute action on selected service: ")
Write-Host("1. Restart service ")
Write-Host("2. Stop service ")
Write-Host("3. Start service")
$choice = Read-Host -Prompt "Your choice"

switch ($choice)
{
    1 {Invoke-command -Computername $Server {Restart-Service -Name "$Service" } }
    2 {Invoke-command -ComputerName $Server {Stop-Service  -Name "$Service" } }
    3 {Invoke-command -ComputerName $Server {Start-Service -Name "$Service" } }
}

我试过了:

• $Service 周围的单引号
• $Service 周围的双引号
• 在脚本块中使用 param([String]$Service)

我一遍又一遍地得到同样的错误:

I keep getting the same error over and over:

Cannot bind argument to parameter 'Name' because it is an empty string.
    + CategoryInfo          : InvalidData: (:) [Stop-Service], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorEmptyStringNotAllowed,Microsoft.PowerShell.Commands.StopServiceCommand

我知道这与我试图在远程机器上运行本地变量有关.但是有人能指出我正确的方向吗，我希望脚本简单地使用强制参数

I know it has to do with the fact Im trying to run local variable on a remote machine. but could someone point me in the right direction , I would love for the script to simply use the mandatory parameters

使用这里提到的方法如何将局部变量传递给 Invoke-Command 我修改了代码，如下所示:

Using the approach mentionned here How to pass local variable to Invoke-Command's I modified the code like so:

1 {Invoke-command -Computername $Server {param ([string] $srv = $Service) Restart-Service -Name "$srv" } }

不幸的是错误仍然存​​在

Unfortunately the error persists

推荐答案

将参数传递到脚本块的语法应如下所示:

the syntax for parameter passing into a scriptblock should be as follows:

(更正为@pk198105 建议)

(Corrected as @pk198105 suggested)

Invoke-command -Computername $Server  {
param($service)
Restart-Service -Name "$Service" 
} -ArgumentList $service

argumentlist 和 param 都是必需的

both argumentlist and param are required

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