做，直到用戶輸入的是/否

Question

我想寫簡單DO-until循環，它不工作：

$yesNo = Read-Host -prompt 'Do you want to add alternative DNS names or IPs into Certificate? Y/N: ' 

do { 
      $dnsipname = read-host -prompt "Please input DNS or IP as dns=alternativeCNname or ip=ipName: " 
       Write-output "$dnsipname" 
      $strQuit = Read-Host " do you want to add another DNS? (Y/N)" 
       do { 
       $dnsipname = read-host -prompt "Please input DNS or IP as dns=alternativeCNname or ip=ipName: " 
       Write-output "$dnsipname" 
       Add-Content D:\Scripts\expiringCerts\request.inf '`r`n_continue_ = "$dnsipname"' 
       } 
       until ($strQuit -eq "Y" -or "y") 
      } 
until ($yesNo -eq "Y" -or "y") 

這其中只有兩次做循環，但它應該循環每次我打Y但當我打到N或n它應該打破。

任何想法？

Answer 1

在PowerShell中你已經基本上三個選項提示用戶是/否的選擇。

• 的Read-Host的cmdlet：

  $msg = 'Do you want to add alternative DNS names or IPs into Certificate? [Y/N]' 
  do { 
      $response = Read-Host -Prompt $msg 
      if ($response -eq 'y') { 
       # prompt for name/address and add to certificate 
      } 
  } until ($response -eq 'n') 
  

  使用-like 'y*'和-like 'n*'如果你想忽略響應尾隨字符。

• 的PromptForChoice()方法：

  $title = 'Certificate Alternative Names' 
  $msg = 'Do you want to add alternative DNS names or IPs?' 
  
  $yes = New-Object Management.Automation.Host.ChoiceDescription '&Yes' 
  $no = New-Object Management.Automation.Host.ChoiceDescription '&No' 
  $options = [Management.Automation.Host.ChoiceDescription[]]($yes, $no) 
  $default = 1 # $no 
  
  do { 
      $response = $Host.UI.PromptForChoice($title, $msg, $options, $default) 
      if ($response -eq 0) { 
       # prompt for name/address and add to certificate 
      } 
  } until ($response -eq 1) 
  

• 的choice命令：

  $msg = 'Do you want to add alternative DNS names or IPs into Certificate' 
  do { 
      choice /c yn /m $msg 
      $response = $LASTEXITCODE 
      if ($response -eq 0) { 
       # prompt for name/address and add to certificate 
      } 
  } until ($response -eq 1) 
  

Answer 2

您需要具備在do循環內爲until語句（例如，$ strQuit）進行評估的條件，以便更新它。

在if語句中包裝do循環也使得用戶在繼續提示之前詢問他們的過程更加友好。

$dnsipname = read-host -prompt "Please input DNS or IP as dns=alternativeCNname or ip=ipName: " 
Write-Output $dnsipname 
Add-Content D:\Scripts\expiringCerts\request.inf '`r`n_continue_ = "$dnsipname"' 

if ((Read-Host "Do you want to add another DNS or IP? (Y/N)") -eq "Y") { 
    do { 
     $dnsipname = Read-Host "Please input DNS or IP as dns=alternativeCNname or ip=ipName: " 
     Write-output "$dnsipname" 
     Add-Content D:\Scripts\expiringCerts\request.inf '`r`n_continue_ = "$dnsipname"' 
     $strQuit = Read-Host "Do you want to add another DNS or IP? (Y/N)" 
    } 
    until ($strQuit -eq "N") 
} 

Answer 3

我覺得你不需要兩個do-until循環。我也更喜歡do-while（他正在確認y或Y）。

您的Add-Content上的字符串插值不起作用，因爲您使用的是單引號。我想在這裏利用格式字符串：

$yesNo = Read-Host -prompt 'Do you want to add alternative DNS names or IPs into Certificate? Y/N: ' 
if ($yesNo -eq 'y') 
{ 
    do 
    { 
     $dnsipname = read-host -prompt "Please input DNS or IP as dns=alternativeCNname or ip=ipName: " 
     Write-output "$dnsipname" 
     Add-Content -Path "D:\Scripts\expiringCerts\request.inf" -value ('`r`n_continue_ = "{0}"' -f $dnsipname) 
     $strQuit = Read-Host " do you want to add another DNS? (Y/N)"     
    } 
    while($strQuit -eq 'y') 
}