powershell - 无法将参数绑定(bind)到参数 "FilePath"，因为它为空

Question

每次我运行下面的脚本时，我都会得到

Cannot bind argument to parameter 'FilePath' because it is null.

昨晚还在工作。没有进行任何更改，今天早上它只是失败了。有趣的是，如果我保存脚本然后运行它，它就可以工作。但是，如果我清除控制台然后再次运行它会失败。

我错过了一些明显的东西吗？

New-Item -ItemType Directory -Force -Path C:\NonStandard_Services
set-location C:\NonStandard_Services 
$Computers= Get-Content C:\computers.txt
$Report= $file
$file= $Computer
ForEach ($Computer in $Computers)
{
Get-WmiObject -ComputerName $Computer -class Win32_Service -ErrorAction SilentlyContinue | 
Where-Object -FilterScript {$_.StartName -ne "LocalSystem"}|
Where-Object -FilterScript {$_.StartName -ne "NT AUTHORITY\NetworkService"} | 
Where-Object -FilterScript {$_.StartName -ne "NT AUTHORITY\LocalService"} |
Select-Object -Property StartName,Name,DisplayName|
    ConvertTo-Html -Property StartName,Name,DisplayName -head $HTML -body "<H2>Non-    Standard Service Accounts on $Computer</H2>"| Out-File $Report -Append}
    #Rename-Item c:\GP_Services\Report.htm $file 
    Get-ChildItem | Where-Object {$_.extension -ne ".htm"} | Rename-Item -newname { $_.name + '.htm' }

Answer 1

$Report= $file
$file= $Computer
ForEach ($Computer in $Computers)
{
  ...
}

在变量本身被赋值之前，您将变量分配给其他变量。将上面的内容更改为:

ForEach ($Computer in $Computers) {
  $file   = $Computer
  $Report = $file
  ...
}

或者直接使用 $Computer在 Out-File :

... | Out-File "$Computer.txt" -Append