我有一个返回选定值的函数,除非提示关闭。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 )
}
我这样称呼它:
$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了 OK,它将返回选择的任何值(0,1 或 2)。但是,如果提示已关闭,或者用户点击取消,脚本将中止并显示如下消息:
使用“4”参数调用“PromptForChoice”的异常:“发生了“System.Management.Automation.Host.PromptingException”类型的错误。”
提示符上的Cancel键如何被捕获和处理?如果没有选择,我想默认为 0 值, - 回收并继续。
谢谢!