Windows PowerShell 2.0绝对是初学者 - 本书最后一个项目的错误

Question

通过Jerry Lee Ford Jr.的Powershell 2.0 for Absolute Beginner一书.本书的代码中有很多印刷错误,我已经能够通过并纠正(很棒的练习),但有一个我根本无法弄清楚.从配套网站下载了他的股票代码,他的代码抛出完全相同的错误.代码如下:

# *************************************************************************
#
# Script Name: GameConsole.ps1 (The PowerShell Game Console)
# Version:     1.0
# Author:      Jerry Lee Ford, Jr.
# Date:        January 1, 2007
# 
# Description: This PowerShell script provides a listing of PowerShell
#              game scripts and allows the player to play any game by 
#              entering its menu number.
# 
# *************************************************************************


# Initialization Section

$menuList = @()  #Stores an array containing information about script games
$playAgain = "True"  #Controls the execution of a loop that controls game
                     #execution

# Functions and Filters Section

#This function gets the player's permission to begin the game
function Get-GameListing {

  $gameList = @()  #Stores and array containing a list of PowerShell scripts
  $i = 0  #Used to set the index value of the array when adding elements to it

  Clear-Host  #Clear the screen
  Write-Host  #Display a game console header
  Write-Host " --------------------------------------------------------------"
  Write-Host " Windows PowerShell Game Console" -foregroundColor darkred
  Write-Host " --------------------------------------------------------------"

  $location = Set-Location C:\ShellScripts\Games  #Specify the location of the game scripts

  #Load an array with a list of all the PowerShell scripts in the specified folder
  $gameList = Get-ChildItem . *.ps1  # | ForEach-Object -process {$i++; $gameList[$i] = $_.Name }
  $gameList  #Return the contents of the array to the calling statement

}

#This function displays a menu listing of PowerShell games
function Write-MenuList {

  param($list)  #The list of games to be displayed is passed as an array
  $Counter = 0  #Used to number each menu item

  Write-Host ""

  ForEach ($i in $list) {  #Iterate for each script stored in the array

    $counter++  #Increment the counter by 1

    if ($counter -lt 10) {  #Format the display of the first 9 scripts
      Write-Host " $counter.  $i" -foregroundColor blue
    }
    else {  #Format the display of all remaining scripts
      Write-Host " $counter. $i" -foregroundColor blue
    }

  }

  Write-Host "`n --------------------------------------------------------------"

}

function End-ScriptExecution {

  Clear-Host #Clear the screen

  Write-Host "`n Thank you for using the Windows PowerShell Game Console"

  Start-Sleep 3  #Pause the execution of the script for 3 seconds

  Clear-Host  #Clear the screen

}


# Main Processing Section

$response = 0  #Stores player input

#Continue playing new games until the player decides to close the game console
while ($playAgain -eq "True") {

  #Call the function that generates an array containing a list of game scripts
  $menuList = Get-GameListing  

  #Call function that converts the contents of the array into a list of menu items
  Write-MenuList $menuList

  #Prompt the player to pick a game to play
  $response = Read-Host "`n Enter the menu number for a game or Q to quit"

  #Prepare to close the game console when the user decides to quit
  if ($response -eq "Q") {
    $playAgain = "False"  #Modify variable value in order to terminate the loop
    continue  #Repeat the loop
  }

  #Convert the player's input to a integer and then validate the player's input
  if ([int]$response -lt 1) {  #Anything below 1 is not a valid menu number
    Clear-Host  #Clear the screen
    Write-Host "`n `a`aInvalid selection."
    Read-Host   #Pause the script until the player presses the Enter key
    continue    #Repeat the loop
  }

  if ([int]$response -gt $menuList.length) {
    Clear-Host  #Clear the screen
    Write-Host "`n `a`aInvalid selection."
    Read-Host   #Pause the script until the player presses the Enter key
    continue    #Repeat the loop
  }

  Invoke-Expression $menuList[$response]  #Executed the selected game script

  Clear-Host  #Clear the screen

}

End-ScriptExecution

抛出的错误是:

The term 'fortuneteller.ps1' is not recognized as the name of a cmdlet, functio
n, script file, or operable program. Check the spelling of the name, or if a pa
th was included, verify that the path is correct and try again.
At line:1 char:18
+ fortuneteller.ps1 <<<< 
    + CategoryInfo          : ObjectNotFound: (fortuneteller.ps1:String) [], C 
   ommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

无论我选择什么ps脚本菜单项,我都会遇到同样的错误.任何帮助将不胜感激!

Answer 1

修改此行:

Invoke-Expression $menuList[$response]  #Executed the selected game script 

至:

Invoke-Expression $menuList[$response].FullName

或者我的偏好:

& $menuList[$response].FullName

它失败很可能是因为它试图执行"FortuneTeller.ps1"并且工作目录不在该目录中,或者即使它在该目录中,PowerShell也不会从当前目录执行脚本而不指定路径,例如"\FortuneTeller.ps1" .通过FullName属性指定完整路径,可以避免此问题.