cmdlet 的 LiteralPath 选项 [英] LiteralPath option for cmdlet

问题描述

在我在教程和书籍中看到的大多数示例中，默认情况下几乎从不使用 -LiteralPath 选项(似乎首选 -Path 选项).因为 -LiteralPath 选项允许使用保留字符(例如 [])，我不明白为什么不经常使用它(如果不是，则一直使用).是因为更喜欢手动转义保留字符，因为它的性能成本很高，因为不是所有的cmdlet都支持这个选项还是因为别的什么?

解决方案

需要考虑的一点是 -Path 最有可能是通过管道传入字符串时使用的参数.

以 Get-Item cmdlet 为例:

<块引用>

-LiteralPath 必需的?真的位置?命名接受管道输入?真(按属性名称)参数集名称 LiteralPath别名 PSPath动态的?错误的-路径<字符串[]>必需的?真的位置?0接受管道输入?true (ByValue, ByPropertyName)参数集名称 路径别名 无动态的?错误的

管道化一个字符串让你-Path.您的对象必须具有 LiteralPath(或 PSPath)属性，以便 Get-Item 使用它.如果您的对象同时具有，则使用 -Path.

我想这不一定能回答问题；说-Path 使用更频繁，因为它更受欢迎"有点循环.一个更好的问题可能是，为什么 -Path 的行为首先不像 -LiteralPath?"

In most example that I see in tutorials and books, the -LiteralPath option is almost never used by default (the -Path option seems to be preferred). Because the -LiteralPath option allows to use reserved characters (e.g. []), I don't understand why it is not used more often (if not, all the time). Is it because it is preferred to escape reserved characters manually, because it has a high performance cost, because not all cmdlet support this option or because something else?

解决方案

One thing to consider is that -Path is most likely to be the parameter that used when a string is passed in through the pipeline.

Looking at the Get-Item cmdlet for instance:

-LiteralPath <string[]>

Required?                    true
Position?                    Named
Accept pipeline input?       true (ByPropertyName)
Parameter set name           LiteralPath
Aliases                      PSPath
Dynamic?                     false

-Path <string[]>

Required?                    true
Position?                    0
Accept pipeline input?       true (ByValue, ByPropertyName)
Parameter set name           Path
Aliases                      None
Dynamic?                     false

Piping a string gets you -Path. Your object(s) would have to have a LiteralPath (or PSPath) property for Get-Item to use it. If your object has both, -Path is used.

I guess this doesn't necessarily answer the question; it's a bit circular to say "-Path is used more often because it's more popular". A better question might be, "Why doesn't -Path behave like -LiteralPath in the first place?"

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