如何在 PowerShell 中使用 -confirm

Question

我正在尝试接受用户输入，在继续之前，我希望在屏幕上收到一条消息，而不是确认用户是否要继续。我正在使用以下代码，但它不起作用：

write-host "Are you Sure You Want To Proceed:"  -Confirm

Answer 1

-Confirm 是大多数 PowerShell cmdlet 中的一个开关，它强制 cmdlet 要求用户确认。你真正要找的是Read-Host cmdlet：

$confirmation = Read-Host "Are you Sure You Want To Proceed:"
if ($confirmation -eq 'y') {
    # proceed
}

或主机用户界面的PromptForChoice()方法：

$title    = 'something'
$question = 'Are you sure you want to proceed?'

$choices = New-Object Collections.ObjectModel.Collection[Management.Automation.Host.ChoiceDescription]
$choices.Add((New-Object Management.Automation.Host.ChoiceDescription -ArgumentList '&Yes'))
$choices.Add((New-Object Management.Automation.Host.ChoiceDescription -ArgumentList '&No'))

$decision = $Host.UI.PromptForChoice($title, $question, $choices, 1)
if ($decision -eq 0) {
    Write-Host 'confirmed'
} else {
    Write-Host 'cancelled'
}

---

编辑：

正如 M-pixel 在 cmets 中指出的那样，代码可以进一步简化，因为选择可以作为简单的字符串数组传递。

$title    = 'something'
$question = 'Are you sure you want to proceed?'
$choices  = '&Yes', '&No'

$decision = $Host.UI.PromptForChoice($title, $question, $choices, 1)
if ($decision -eq 0) {
    Write-Host 'confirmed'
} else {
    Write-Host 'cancelled'
}

Answer 2

这是一个简单的循环，除非用户选择'y'或'n'，否则会一直提示

$confirmation = Read-Host "Ready? [y/n]"
while($confirmation -ne "y")
{
    if ($confirmation -eq 'n') {exit}
    $confirmation = Read-Host "Ready? [y/n]"
}

Answer 3

Read-Host 是 -Confirm 对它没有影响的 cmdlet 的一个示例。-Confirm 是 PowerShell 的常用参数之一，特别是在 cmdlet 即将进行更改时使用的风险缓解参数到 Windows PowerShell 环境之外的系统。许多但不是所有 cmdlet 都支持 -Confirm 风险缓解参数。

以下是使用Read-Host cmdlet 和正则表达式测试来获得用户确认的示例：

$reply = Read-Host -Prompt "Continue?[y/n]"
if ( $reply -match "[yY]" ) { 
    # Highway to the danger zone 
}

Remove-Variable cmdlet 是一个说明-confirm 开关用法的示例。

Remove-Variable 'reply' -Confirm

其他参考：CommonParameters、Write-Host、Read-Host、Comparison Operators、Regular Expressions、Remove-Variable

Answer 4

write-host 没有-confirm 参数。

你可以这样做：

    $caption = "Please Confirm"    
    $message = "Are you Sure You Want To Proceed:"
    [int]$defaultChoice = 0
    $yes = New-Object System.Management.Automation.Host.ChoiceDescription "&Yes", "Do the job."
    $no = New-Object System.Management.Automation.Host.ChoiceDescription "&No", "Do not do the job."
    $options = [System.Management.Automation.Host.ChoiceDescription[]]($yes, $no)
    $choiceRTN = $host.ui.PromptForChoice($caption,$message, $options,$defaultChoice)

if ( $choiceRTN -ne 1 )
{
   "Your Choice was Yes"
}
else
{
   "Your Choice was NO"
}

Answer 5

这里是来自 Microsoft 的 documentation，关于如何在 cmdlet 中请求确认。这些示例使用 C# 编写，但您也可以执行 PowerShell 中显示的所有操作。

首先将CmdletBinding 属性添加到您的函数中，并将SupportsShouldProcess 设置为true。然后可以引用$PSCmdlet变量的ShouldProcess和ShouldContinue方法。

这是一个例子：

function Start-Work {
    <#
    .SYNOPSIS Does some work
    .PARAMETER Force
        Perform the operation without prompting for confirmation
    #>
    [CmdletBinding(SupportsShouldProcess=$true)]
    param(
        # This switch allows the user to override the prompt for confirmation
        [switch]$Force
    )
    begin { }
    process {
        if ($PSCmdlet.ShouldProcess('Target')) {
            if (-not ($Force -or $PSCmdlet.ShouldContinue('Do you want to continue?', 'Caption'))) {
                return # user replied no
            }

            # Do work
        }

    }
    end { }
}

Answer 6

当你想要一个 1-liner

while( -not ( ($choice= (Read-Host "May I continue?")) -match "y|n")){ "Y or N ?"}

Answer 7

Write-Warning "This is only a test warning." -WarningAction Inquire

来自： https://serverfault.com/a/1015583/584478

Answer 8

这是我使用过的解决方案，类似于 Ansgar Wiechers 的解决方案；

$title = "Lorem"
$message = "Ipsum"

$yes = New-Object System.Management.Automation.Host.ChoiceDescription "&Yes", "This means Yes"
$no = New-Object System.Management.Automation.Host.ChoiceDescription "&No", "This means No"

$options = [System.Management.Automation.Host.ChoiceDescription[]]($yes, $no)

$result = $host.ui.PromptForChoice($title, $message, $Options, 0)

Switch ($result)
     {
          0 { "You just said Yes" }
          1 { "You just said No" }
     }

Answer 9

基于Ansgar Wiechers's answer 的稍微漂亮的函数。它是否真的更有用是一个争论的问题。

function Read-Choice(
   [Parameter(Mandatory)][string]$Message,
   [Parameter(Mandatory)][string[]]$Choices,
   [Parameter(Mandatory)][string]$DefaultChoice,
   [Parameter()][string]$Question='Are you sure you want to proceed?'
) {
    $defaultIndex = $Choices.IndexOf($DefaultChoice)
    if ($defaultIndex -lt 0) {
        throw "$DefaultChoice not found in choices"
    }

    $choiceObj = New-Object Collections.ObjectModel.Collection[Management.Automation.Host.ChoiceDescription]

    foreach($c in $Choices) {
        $choiceObj.Add((New-Object Management.Automation.Host.ChoiceDescription -ArgumentList $c))
    }

    $decision = $Host.UI.PromptForChoice($Message, $Question, $choiceObj, $defaultIndex)
    return $Choices[$decision]
}

示例用法：

PS> $r = Read-Choice 'DANGER!!!!!!' '&apple','&blah','&car' '&blah'

DANGER!!!!!!
Are you sure you want to proceed?
[A] apple  [B] blah  [C] car  [?] Help (default is "B"): c
PS> switch($r) { '&car' { Write-host 'caaaaars!!!!' } '&blah' { Write-Host "It's a blah day" } '&apple' { Write-Host "I'd like to eat some apples!" } }
caaaaars!!!!

Answer 10

我更喜欢弹出窗口。

$shell = new-object -comobject "WScript.Shell"
$choice = $shell.popup("Insert question here",0,"Popup window title",4+32)

如果 $choice 等于 6，答案是肯定的 如果 $choice 等于 7，则答案是否定的