Powershell: Error while replacing the sub-string in a file - powershell

Question

I am trying to replace some of the sub-strings with some values across multiple files. I have written this code to do so.
$dirPath = 'C:\repos\sync_cpc_cva\ExpressV2\Parameters\AG08\KeyVault'
$ConfigPath = 'C:\repos\sync_cpc_cva\config.json'
$lookupTable = #{}
(Get-Content -Raw -Path $configPath | ConvertFrom-Json).psobject.properties | Foreach { $lookupTable[$_.Name] = $_.Value }
Get-ChildItem -Path $dirPath -Recurse -Filter *.json |
Foreach-Object {
Get-Content $_.FullName | ForEach-Object {
$line = $_
$lookupTable.GetEnumerator() | ForEach-Object {
if($line -match $_.Key) {
$line = $line -replace $_.Key, $_.Value
}
}
$line
} | Set-Content -Path $_.FullName
}
If I print the content, it has replaced all the values correctly, however, it is unable to set the contents into the same file. And I am getting following error while running the code :
Set-Content : The process cannot access the file
'C:\repos\sync_cpc_cva\ExpressV2\Parameters\AG08\KeyVault\KeyVault.USNat.json' because it is being used by another process.
At C:\repos\sync_cpc_cva\filltest.ps1:22 char:9
+ } | Set-Content -Path $_.FullName
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Set-Content], IOException
+ FullyQualifiedErrorId : System.IO.IOException,Microsoft.PowerShell.Commands.SetContentCommand
Any idea how can I replace the sub-strings in the same file?

Answer 1

You have several inner foreach-object loops, so you modify the $_ operator while being used. I dont think this can work. Revolve it like this:
$lookupTable = #{}
(Get-Content -Raw -Path $configPath | ConvertFrom-Json).psobject.properties | Foreach { $lookupTable[$_.Name] = $_.Value }
$files = Get-ChildItem -Path $dirPath -Recurse -Filter *.json
foreach ($file in $files) {
$content = Get-Content $file.FullName
for($i=0;$i -lt $content.length; $i++) {
$lookupTable.GetEnumerator() | ForEach-Object {
$content[$i] = $content[$i] -replace $_.Key, $_.Value
}
}
$content | Set-Content $file.FullName
}