如何在PowerShell中没有任何预定义路径的情况下读取文件输入？ [英] How can I read file input without any pre-defined path in PowerShell?

问题描述

我有用户提供输入txt文件作为参数 -InputFile 我存储为 $ inputfile 。但是当我尝试：

I have users provide an input txt file as an argument -InputFile which I store as $inputfile. But when I try:

$reader = [System.IO.File]::OpenText("$inputfile")

PowerShell会自动将 $ inputfile 路径附加到C： \Windows\system32。如何让PowerShell不假设路径前缀，因此用户只需传递 -InputFile inputfile.txt ，如果他们想要的文件位于运行它们的同一目录中脚本？我如何支持它们枚举一个完全不同的文件路径，如果它在当前目录之外而没有自动附加到C：\ Windows \ system32？

PowerShell automatically appends the $inputfile path to C:\Windows\system32. How can I have PowerShell not assume a path prefix, so a user could simply pass -InputFile inputfile.txt if the file they want is in the same directory from which they run the script? How can I also support them enumerating a completely different path to the file if it's outside of the current directory without having it automatically append to C:\Windows\system32?

编辑：根据您的建议将变量$ input更改为$ inputfile。

Changed the variable "$input" to "$inputfile" per your advice.

推荐答案

使用 Resolve-Path 用于解析在将其传递给 OpenText（）之前/之后的路径：

$reader = [IO.File]::OpenText((Resolve-Path $InputFile).Path)

由于 Resolve-Path 在无法解析您可能想要运行的路径时抛出异常这在 try..catch 块中，例如像这样：

Since Resolve-Path throws an exception when it can't resolve a path you may want to run this in a try..catch block, e.g. like this:

try {
    $path = (Resolve-Path $InputFile).Path
    $reader = [IO.File]::OpenText($path)
} catch [Management.Automation.ItemNotFoundException] {
    # cannot resolve path
} catch {
    # other error
}

或者更好的是，验证参数：

or, better yet, validate the parameter:

[Parameter(Mandatory=$true)]
[ValidateNotNullOrEmpty()]
[ValidateScript({Test-Path -LiteralPath $_ -Type Leaf})]
[string]$InputFile

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