Question

我有一个函数返回一个选定的值，除非提示被关闭。功能是：

function Read-Choice {
#.Synopsis
#  Prompt the user for a choice, and return the (0-based) index of the selected item
#.Parameter Message
#  The question to ask
#.Parameter Choices
#  An array of strings representing the "menu" items, with optional ampersands (&) in them to mark (unique) characters to be used to select each item
#.Parameter DefaultChoice
#  The (0-based) index of the menu item to select by default (defaults to zero).
#.Parameter Title
#  An additional caption that can be displayed (usually above the Message) as part of the prompt
#.Example
#  Read-Choice "WEBPAGE BUILDER MENU"  "Create Webpage","View HTML code","Publish Webpage","Remove Webpage","E&xit"
PARAM([string]$message, [string[]]$choices, [int]$defaultChoice=0, [string]$Title=$null )
   if($choices[0].IndexOf('&') -lt 0) {
      $i = 0; 
      $choices = $choices | ForEach-Object {
         if($_ -notmatch '&.') { "&$i $_" } else { $_ }
         $i++
      }
   }
   $Host.UI.PromptForChoice( $Title, $message, [Management.Automation.Host.ChoiceDescription[]]$choices, $defaultChoice )
}

我称之为：

$SetDeletes = read-choice "Delete Files" "Recycle","Kill","E&xit" 0 $message

提示用户选择0 Recycle，1 Kill或Exit。如果选择了这三个中的一个并且用户点击OK，则返回所选的任何值（0,1或2）。但是，如果提示已关闭，或者用户点击取消，则脚本将中止并显示如下消息：

使用“4”参数调用“PromptForChoice”的异常：“错误键入“System.Management.Automation.Host .PromptingException” 发生“。

如何捕获和处理提示上的Cancel键？如果没有选择，我想默认为0值， - 回收并继续。

谢谢！

Answer 1

我不能在V3上重复这一点，这对V3用户来说很好，但在V2的情况下，你试过在PromptForChoice调用周围尝试一下try / catch：

try {
    $Host.UI.PromptForChoice($Title, $message, $choices, $defaultChoice)
}
catch [Management.Automation.Host.PromptingException] {
    $defaultChoice
}

Powershell - 捕获取消输入

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