Question

qqq.exe存在。

$ DB是正确的，我在其他时候使用它就好了。

$DB = Get-Content C:\Users\asd\Desktop\Farm\AccountList.txt
foreach ($x in $DB){
    Rename-Item C:\Users\asd\Desktop\Farm\$x\qqq.exe $x.exe
}

Rename-Item：无法将参数绑定到参数'NewName'，因为它为null。在C：\ Users \ asd \ Desktop \ Farm \ test2.ps1：3 char：57 +重命名 - 项目C：\ Users \ asd \ Desktop \ Farm \ $ x \ qqq.exe $ x.exe + ~~~~~~ + CategoryInfo：InvalidData :( :) [Rename-Item]，ParameterBindingValidationException + FullyQualifiedErrorId：ParameterArgumentValidationErrorNullNotAllowed，Microsoft.PowerShell.Commands.RenameItemCommand

Answer 1

当powershell解析器看到以$开头的参数时，它会将其视为表达式，这意味着它将尝试将其作为代码进行评估。

由于字符串$x没有名为exe的属性，因此表达式会导致$null和Rename-Item抛出您看到的错误。

如果您使用双引号字符串，解析器将在点后停止评估$x：

Rename-Item C:\Users\asd\Desktop\Farm\$x\qqq.exe "$x.exe"

来自Get-Help about_Parsing ：

When processing a command, the Windows PowerShell parser operates
in expression mode or in argument mode: 

    - In expression mode, character string values must be contained in
      quotation marks. Numbers not enclosed in quotation marks are treated
      as numerical values (rather than as a series of characters). 

    - In argument mode, each value is treated as an expandable string 
      unless it begins with one of the following special characters: dollar
      sign ($), at sign (@), single quotation mark ('), double quotation
      mark ("), or an opening parenthesis (().

无法重命名powershell中的项目，因为它为null

1 个答案: