Get-ChildItem 在 PowerShell 中递归作为参数

发布于 2024-08-14 01:19:54 字数 680 浏览 5 评论 0原文

我希望创建一个可以在 cmdlet Get-ChildItem。

作为一个非常基本的示例：

...

param 
(   
    [string] $sourceDirectory = ".",
    [string] $fileTypeFilter = "*.log",
    [boolean] $recurse = $true
)

Get-ChildItem $sourceDirectory -recurse -filter $fileTypeFilter | 

...

如何有条件地将 -recurse 标志添加到 Get-ChildItem 而无需诉诸某些 if/else 语句？

我想也许可以用 $recurseText 参数替换 Get-ChildItem 语句中的 -recurse （如果 $recurse 为 true，则设置为“-recurse”），但是这似乎不起作用。

原文

I am looking to create a function that could toggle the ability to recurse in cmdlet Get-ChildItem.

As a very basic example:

...

param 
(   
    [string] $sourceDirectory = ".",
    [string] $fileTypeFilter = "*.log",
    [boolean] $recurse = $true
)

Get-ChildItem $sourceDirectory -recurse -filter $fileTypeFilter | 

...

How does one conditionally add the -recurse flag to Get-ChildItem without having to resort to some if/else statement?

I thought perhaps one could just substitute the -recurse in the Get-ChildItem statement with a $recurseText parameter (set to "-recurse" if $recurse were true), but that does not seem to work.

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客…行舟 2024-08-21 01:19:54

这里有几件事。首先，您不想使用 [boolean] 作为递归参数的类型。这要求您在脚本上传递 Recurse 参数的参数，例如 -Recurse $true。您想要的是一个 [switch] 参数，如下所示。此外，当您将开关值转发到 Get-ChildItem 上的 -Recurse 参数时，请使用 : ，如下所示：

param (
    [string] $sourceDirectory = ".",
    [string] $fileTypeFilter = "*.log",
    [switch] $recurse
)

get-childitem $sourceDirectory -recurse:$recurse -filter $fileTypeFilter | ...

A couple of things here. First, you don't want to use [boolean] for the type of the recurse parameter. That requires that you pass an argument for the Recurse parameter on your script e.g. -Recurse $true. What you want is a [switch] parameter as shown below. Also, when you forward the switch value to the -Recurse parameter on Get-ChildItem use a : as shown below:

param (
    [string] $sourceDirectory = ".",
    [string] $fileTypeFilter = "*.log",
    [switch] $recurse
)

get-childitem $sourceDirectory -recurse:$recurse -filter $fileTypeFilter | ...

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他夏了夏天 2024-08-21 01:19:54

PowerShell V1 解决此问题的方法是使用其他答案中描述的方法 (-recurse:$recurse)，但在 V2 中，有一种名为 splatting 可以更轻松地将参数从一个函数传递到另一个函数。

Splatting 允许您将字典或参数列表传递给 PowerShell 函数。这是一个简单的例子。

$Parameters = @{
    Path=$home
    Recurse=$true
}
Get-ChildItem @Parameters

在每个函数或脚本内部，您可以使用 $psBoundParameters 来获取当前绑定的参数。通过向 $psBoundParameters 添加或删除项目，可以轻松获取当前函数并使用某些函数的参数调用 cmdlet。

我希望这有帮助。

The PowerShell V1 way to approach this is to use the method described in the other answers (-recurse:$recurse), but in V2 there is a new mechanism called splatting that can make it easier to pass the arguments from one function to another.

Splatting will allow you to pass a dictionary or list of arguments to a PowerShell function. Here's a quick example.

$Parameters = @{
    Path=$home
    Recurse=$true
}
Get-ChildItem @Parameters

Inside of each function or script you can use $psBoundParameters to get the currently bound parameters. By adding or removing items to $psBoundParameters, it's easy to take your current function and call a cmdlet with some the functions' arguments.

I hope this helps.

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云雾 2024-08-21 01:19:54

我之前问过一个类似的问题...我接受的答案基本上是在PowerShell v1中，只是传递命名参数，如下所示：

get-childitem $sourceDirectory -recurse:$recurse -filter ...

I asked a similar question before... My accepted answer was basically that in v1 of PowerShell, just passing the named parameter through like:

get-childitem $sourceDirectory -recurse:$recurse -filter ...

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摇划花蜜的午后 2024-08-21 01:19:54

以下是您可以使用的参数类型的详细列表：

param(
    [string] $optionalparam1, #an optional parameter with no default value
    [string] $optionalparam2 = "default", #an optional parameter with a default value
    [string] $requiredparam = $(throw ""requiredparam required."), #throw exception if no value provided
    [string] $user = $(Read-Host -prompt "User"), #prompt user for value if none provided
    [switch] $switchparam; #an optional "switch parameter" (ie, a flag)
    )

来自此处

Here's a good list of the types of parameters you can use:

param(
    [string] $optionalparam1, #an optional parameter with no default value
    [string] $optionalparam2 = "default", #an optional parameter with a default value
    [string] $requiredparam = $(throw ""requiredparam required."), #throw exception if no value provided
    [string] $user = $(Read-Host -prompt "User"), #prompt user for value if none provided
    [switch] $switchparam; #an optional "switch parameter" (ie, a flag)
    )

From here

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