ErrorActionPreference and ErrorAction SilentlyContinue for Get-PSSessionConfiguration

Question

My case:

$ErrorActionPreference = "Stop";
"1 - $ErrorActionPreference;"
Get-ChildItem NoSuchFile.txt -ErrorAction SilentlyContinue;
"2 - $ErrorActionPreference;"
Get-ChildItem NoSuchFile.txt -ErrorAction Stop;
"3 - $ErrorActionPreference;"

Output:

1 - Stop;
2 - Stop;
and display an error...

Now,

$ErrorActionPreference = "Stop";
"1 - $ErrorActionPreference;"
(Get-PSSessionConfiguration -Name "MyShellUri" -ErrorAction SilentlyContinue)
"2 - $ErrorActionPreference;"

Output:

1 - Stop;
and display an error...

Why doesn't work -ErrorAction SilentlyContinue) for Get-PSSessionConfiguration ?

Update:

Now,

$ErrorActionPreference = "Continue"
"1 - $ErrorActionPreference;"
(Get-PSSessionConfiguration -Name "MyShellUri" -ErrorAction SilentlyContinue)
"2 - $ErrorActionPreference;"

Output:

1 - Continue;
2 - Continue;

Now,

$ErrorActionPreference = "SilentlyContinue"
"1 - $ErrorActionPreference;"
(Get-PSSessionConfiguration -Name "MyShellUri" -ErrorAction SilentlyContinue)
"2 - $ErrorActionPreference;"

Output:

1 - SilentlyContinue;
2 - SilentlyContinue;

This reference:

The ErrorAction ubiquitous parameter can be used to silence non-terminating errors using the parameter value SilentlyContinue and it can be used to convert non-terminating errors to terminating errors using the parameter value Stop. However it can't help you ignore terminating errors and in this case Stop-Transcript is throwing a terminating error. If you want to ignore, use a try/catch e.g.:

try { Stop-Transcript } catch {}

Answer 1

A solution for me:

$old_ErrorActionPreference = $ErrorActionPreference
$ErrorActionPreference = 'SilentlyContinue'
if((Get-PSSessionConfiguration -Name "MyShellUri" -ErrorAction SilentlyContinue) -eq $null) {
   WriteTraceForTrans "The session configuration MyShellUri is already unregistered."
}
else {        
   #Unregister-PSSessionConfiguration -Name "MyShellUri" -Force -ErrorAction Ignore
}
$ErrorActionPreference = $old_ErrorActionPreference 

Or use try-catch

try { 

(Get-PSSessionConfiguration -Name "MyShellUri" -ErrorAction SilentlyContinue)

} 
catch {

}