ConvertFrom-String 返回符号而不是文本 [英] ConvertFrom-String returns symbol not text

问题描述

使用学生文本名称 Infinity 执行以下代码将返回无穷大符号而不是实际文本.任何人都可以解释为什么会出现这种情况以及可以采取哪些措施来纠正.

Performing the following code with student text name Infinity returns the infinity symbol and not the actual text. Can anyone explain why this is the case and what can be done to rectify.

$person="Infinity,One"
$personsplit=$person | ConvertFrom-String -Delimiter "," -PropertyNames firstname,surname

$personsplit 返回以下输出

名字现在是一个符号而不是文本数据?

the first name is now a symbol and not text data?

期望看到输出

first name surname
--------- -------
 Infinity One 

但是，它返回以下内容

firstname surname  
--------- -------   
     ∞    One

对于任何有兴趣的人，我目前正在运行以下版本的 powershell

For anyone interested Im currently running the following version of powershell

PS C:\WINDOWS\system32> $psversiontable

Name                           Value                                           
----                           -----                                           
PSVersion                      5.1.17763.503                                   
PSEdition                      Desktop                                         
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                         
BuildVersion                   10.0.17763.503                                  
CLRVersion                     4.0.30319.42000                                 
WSManStackVersion              3.0                                             
PSRemotingProtocolVersion      2.3                                             
SerializationVersion           1.1.0.1 

推荐答案

您似乎发现了 ConvertFrom-String 尝试自动转换其值的方式的错误/怪癖创建，并且在您的情况下似乎采用字符串 'Infinity' 而转换为 [single]::PositiveInfinity.

It looks like you've found a bug/quirk in the way that ConvertFrom-String attempts to automatically cast the values that it creates, and in your case seems to take the string 'Infinity' and instead cast is as [single]::PositiveInfinity.

另一种更安全的解决方案是不使用 ConvertFrom-String 而是执行以下操作:

An alternative safer solution would be to not use ConvertFrom-String and do something like this instead:

$person="Infinity,One"
$personsplit = $person -split ','

[pscustomobject]@{
    firstname = $personsplit[0]
    lastname = $personsplit[1]
}

如果您不介意将它们放在不同的变量中，您也可以这样做:

If you don't mind them being in separate variables you could also do this:

$firstname,$lastname = $person -split ','

这篇关于ConvertFrom-String 返回符号而不是文本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IT屋！