如何在Powershell中定义不带任何值的可选参数？ （例如，get-object -verbose）

Question

我需要在Powershell脚本中公开调试或详细数据。如何定义允许用户使用get-object或get-object -verbose运行的函数？

Answer 1

将CmdletBinding属性应用于您的函数：

function Get-Object
{
    [CmdletBinding()]
    PARAM()

    Write-Verbose "You'll only see this with -Verbose"
}

Answer 2

要不，请使用-verbose，但要使用开关：

function get-object{
   param (
     [switch]$gassy
   )
   "switch gassy is {0}" -f $gassy
}

---

> get-object
switch gassy is False
> get-object -gassy
switch gassy is True

---

请参见Get-Help about_commonparameters

  

-详细[：{$ true | $ false}]          别名：vb

   Displays detailed information about the operation performed by the
   command. This information resembles the information in a trace or in
   a transaction log. This parameter works only when the command generates
   a verbose message. For example, this parameter works when a command
   contains the Write-Verbose cmdlet.

   The Verbose parameter overrides the value of the $VerbosePreference
   variable for the current command. Because the default value of the
   $VerbosePreference variable is SilentlyContinue, verbose messages
   are not displayed by default.

   Valid values:

       $true (-Verbose:$true) has the same effect as -Verbose.

       $false (-Verbose:$false) suppresses the display of verbose
       messages. Use this parameter when the value of $VerbosePreference
       is not SilentlyContinue (the default).

Answer 3

您可以调用param函数。在这种情况下，我定义了一个名为$obj的变量，它是一个字符串，并绑定到一个名为“ Get-Object”的命令行参数。

param (
    [string]$obj = Get-Object 
)

If($obj)
{
    "Do Something"
}
else
{
    "Do Something Else"
}