How to continue a loop while saving error details for later?

Question

I want to run a loop, and continue through terminating errors, but save the error info for later.

Something like this I tried with ErrorVariable:

Sample code 1

foreach ($index in 0..10) {
    Write-Host $index

    if ($index -eq 6 -or $index -eq 8) {
        Get-ChildItem -Path C:\DoesNotExist\ -ErrorAction SilentlyContinue -ErrorVariable +test
    }
}

$test

Sample code output

0
1
2
3
4
5
6
7
8
9
10
Get-ChildItem : Cannot find path 'C:\DoesNotExist\' because it does not exist.
At line:5 char:9
+         Get-ChildItem -Path C:\DoesNotExist\ -ErrorAction SilentlyCon ...
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\DoesNotExist\:String) [Get-ChildItem], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetChildItemCommand
 
Get-ChildItem : Cannot find path 'C:\DoesNotExist\' because it does not exist.
At line:6 char:9
+         Get-ChildItem -Path C:\DoesNotExist\ -ErrorAction SilentlyCon ...
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\DoesNotExist\:String) [Get-ChildItem], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetChildItemCommand

The problem with the output is that it doesn't contain further details on the error instance, how can I know which loop index that the error occurred?

An alternative thought I had was using trap, but trap won't work with the loop

Sample code 2

foreach ($index in 0..10) {
    Write-Host $index

    if ($index -eq 6 -or $index -eq 8) {
        Get-ChildItem -Path C:\DoesNotExist\ -ErrorAction SilentlyContinue
    }
}

trap {
    Write-Host "Trap $index" -ForegroundColor Cyan
    Write-Error $error[0]
    continue
}

Psuedo desired output

0
1
2
3
4
5
6

Trap 6

 : Cannot find path 'C:\DoesNotExist\' because it does not exist.
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException

Trap 8

 : Cannot find path 'C:\DoesNotExist\' because it does not exist.
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException

Answer 1

Two alternatives, using a try / catch instead of trap, this method requires -ErrorAction Stop:

foreach ($index in 0..10) {
    Write-Host $index

    if ($index -eq 6 -or $index -eq 8) {
        try {
            Get-ChildItem -Path C:\DoesNotExist\ -ErrorAction Stop
        }
        catch {
            Write-Host "Catch $index" -ForegroundColor Cyan
            Write-Error $_
        }
    }
}

Using -ErrorVariable but instead of adding to the array list just overwrite it and check if there were errors, if so, write them:

foreach ($index in 0..10) {
    Write-Host $index

    if ($index -eq 6 -or $index -eq 8) {
        Get-ChildItem -Path C:\DoesNotExist\ -ErrorAction SilentlyContinue -ErrorVariable test
        if ($test) {
            Write-Host "Catch $index" -ForegroundColor Cyan
            $test | Write-Error
        }
    }
}