How do I prevent PowerShell from adding exception data to $error

Question

I am invoking a lot of REST calls in a function. I know that some of them will fail, but that is expected.

My question is:

How do I prevent powershell from adding entries to the global $error variable?

foreach:

$oldErrorActionPreference = $ErrorActionPreference
$ErrorActionPreference = "Ignore"
try {
    $response = Invoke-RestMethod -Uri $Uri -ea Ignore
} catch {
    Write-Verbose "$_"
} finally {
    $ErrorActionPreference = $oldErrorActionPreference
}

$error variable after invoking:

Doesn't $Error store all the errors that have occurred in a Powershell session? It would be much safer to user $error[0] to look at the latest error, then slowly move up the array if required. — Shadowzee
– Shadowzee, Commented Aug 9, 2019 at 7:48
Why would you even want to? What is the problem you're trying to solve? — Ansgar Wiechers
– Ansgar Wiechers, Commented Aug 9, 2019 at 8:34
@AnsgarWiechers I am creating a set of core modules, that in themselves must be non-leaking to $global:error. — Casper Leon Nielsen
– Casper Leon Nielsen, Commented Aug 10, 2019 at 14:01
The exception is "expected" - and is therefore not an error. I do not like that an exceptional state that my code have "accepted", still leaks to global:error. This creates an overloaded $error, that again then cannot be used for tracking and finding real "errors" — Casper Leon Nielsen
– Casper Leon Nielsen, Commented Aug 10, 2019 at 14:02

George Chakhidze · Accepted Answer · 2019-08-09 14:29:35Z

2

Invoke-RestMethod cmdlet always fails with terminating error, which can't be Ignored — it will always end up inside $Error list.

You can clear it: $Error.Clear()

edited Aug 9, 2019 at 14:29

answered Aug 9, 2019 at 14:22

George Chakhidze

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3 Comments

Casper Leon Nielsen Over a year ago

Source for this?

George Chakhidze Over a year ago

@CasperLeonNielsen about Invoke-RestMethod always throwing terminating errors can be deduced from here: github.com/PowerShell/PowerShell/blob/master/src/…

George Chakhidze Over a year ago

@CasperLeonNielsen PowerShell error handling and what and when goes into $Error variable explained (in length) here: github.com/MicrosoftDocs/PowerShell-Docs/issues/1583

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