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问题描述

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我正在寻找一种方法来制作一个 cmdlet,该 cmdlet 接收参数并在输入时提示从预定义的选项数组中完成的建议.

I'm looking for a way to make a cmdlet which receives parameter and while typing, it prompts suggestions for completion from a predefined array of options.

我正在尝试这样的事情:

I was trying something like this:

$vf = @('Veg', 'Fruit')
function Test-ArgumentCompleter {
  [CmdletBinding()]
    param (
          [Parameter(Mandatory=$true)]
          [ValidateSet($vf)]
          $Arg
    )
}

预期的结果应该是:
编写Test-ArgumentCompleter F"时,单击 tub 按钮后,F 自动完成为 Fruit.

The expected result should be:
When writing 'Test-ArgumentCompleter F', after clicking the tub button, the F autocompleted to Fruit.

推荐答案

  • PowerShell 通常要求属性是 literals(例如 'Veg')或 constants(例如 $true).

    • PowerShell generally requires that attribute properties be literals (e.g., 'Veg') or constants (e.g., $true).

      动态功能需要使用 脚本块(本身指定为文字{ ... }),或者在特定情况下,输入文字.

      Dynamic functionality requires use of a script block (itself specified as a literal, { ... }) or, in specific cases, a type literal.

      但是,[ValidateSet()] 属性只接受字符串数组(按需定义)文字或 - 在 PowerShell (Core) v6 及更高版本 - a 输入文字(见下文).

      However, the [ValidateSet()] attribute only accepts an array of string(ified-on-demand) literals or - in PowerShell (Core) v6 and above - a type literal (see below).

      更新:

      • If you're using PowerShell (Core) v6+, there's a simpler solution based on defining a custom class that implements the System.Management.Automation.IValidateSetValuesGenerator interface - see the 2nd solution in iRon's helpful answer.

      即使在 Windows PowerShell 中,也可以使用更简单的解决方案如果您的验证值可以定义为 enum 类型 - 见Mathias R. Jessen 的有用回答.

      Even in Windows PowerShell a simpler solution is possible if your validation values can be defined as an enum type - see Mathias R. Jessen's helpful answer.

      要获得基于非文字值数组的所需功能,您需要结合其他两个属性:

      To get the desired functionality based on a non-literal array of values, you need to combine two other attributes:

      • [ArgumentCompleter()] for dynamic tab-completion.

      [ValidateScript()] 用于确保在命令提交时参数确实是数组中的一个值,使用 脚本块.

      # The array to use for tab-completion and validation.
      [string[]] $vf = 'Veg', 'Fruit'
      
      function Test-ArgumentCompleter {
        [CmdletBinding()]
        param(
          [Parameter(Mandatory)]
          # Tab-complete based on array $vf
          [ArgumentCompleter(
            { param($cmd, $param, $wordToComplete) $vf -like "$wordToComplete*" }
          )]
          # Validate based on array $vf.
          # NOTE: If validation fails, the (default) error message is unhelpful.
          #       Unfortunately, this cannot be helped in *Windows PowerShell*, but in
          #       PowerShell (Core) 7+, you can add an `ErrorMessage` property:
          #         [ValidateScript({ $_ -in $vf }, ErrorMessage = 'Unknown value: {0}')]
          [ValidateScript( { $_ -in $vf })]
          $Arg
        )
      
        "Arg passed: $Arg"
      }
      

      这篇关于无法在 Validateset 中使用预定义数组 - Powershell的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

      1403页,肝出来的..

09-07 00:49