PowerShell参数-“术语'param'不被识别为cmdlet的名称”

Question

Consider:

notepad # Starts Notepad
Get-Process notepad # Finds the processes named notepad
param(
    [Parameter(Mandatory=$true)][string]$ProcessID
) #This should request user input, and store it in a variable#
Stop-Process $ProcessID # Stops the input process ID#

When I try to run this, I'm met with:

param : The term 'param' 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 line:3 char:1
+ param(
+ ~~~~~
    + CategoryInfo          : ObjectNotFound: (param:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Stop-Process : Cannot bind parameter 'InputObject'. Cannot convert the "A" value of type "System.String" to type "System.Diagnostics.Process".
At line:6 char:14
+ Stop-Process $ProcessID
+              ~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Stop-Process], ParameterBindingException
    + FullyQualifiedErrorId : CannotConvertArgumentNoMessage,Microsoft.PowerShell.Commands.StopProcessCommand

I'm quite new to PowerShell, and I'm severely confused because of this at the moment. Either because I don't understand it, or because it's early in the morning.

Answer 1

If your script requires arguments, the Param keyword must be the first statement in the script.

However, you can ask the user for input later by using the Read-Host cmdlet:

$processId = Read-Host "Enter the PID of the process to kill"

Answer 2

The final result after removing the parameters and using the Read-Host cmdlet:

notepad
Get-Process notepad
$ProcessID = Read-Host "Enter the PID of the process to kill"
Stop-Process $ProcessID

It works flawlessly.