PowerShell Try, Catch, custom terminating error message - powershell

Question

Is there a way to customize the error message of a terminating error?
In the example below I would like to just end up with one Try section and collect all errors in one Catch section by combining both script blocks. My problem is that the $error generated by Import-csv is not descriptive enough and I would like to have the text Failed CSV-File import c:\test.csv within the $error message.
Thank you for your advise.
Script block 1
Try {
$File = (Import-Csv -Path c:\test.csv)
}
Catch {
throw $error[0].Exception.Message | Send-Mail $ScriptAdmin "FAILED CSV-File import"
}
Script block 2
try {
if(!(Test-Path $LogFolder -PathType Container)) {throw "Can't find the log folder: '$LogFolder'"}
$Credentials = Import-Credentials $UserName $PasswordFile
}
catch {
throw $Error[0].Exception.Message | Send-Mail $ScriptAdmin "FAILURE"
}
Workaround
A possible solution would be to check first with test-path if the import file exists and then create a throw with a customized message. But I would like to know if it's possible to handle it in one line of code without using test-path first.
Best solution (thanks to mjolinor):
try {
$File = (Import-Csv -Path $ImportFile -Header "A", "B", "C", "D" | Where { $_.A -NotLike "#*" })
if(!(Test-Path $LogFolder -PathType Container)) {throw "Can't find the log folder: '$LogFolder'"}
$Credentials = Import-Credentials $UserName $PasswordFile
}
catch {
Switch -Wildcard ($Error[0].Exception)
{
"*$ImportFile*"
{ $FailType = "FAILED CSV-File import" }
"*$LogFolder*"
{ $FailType = "FAILED Log folder not found" }
"*Import-Credentials*"
{ $FailType = "FAILED Credential import" }
Default
{ $FailType = "FAILED Unrecognized error" }
}
Write-Warning $Error[0].Exception.Message
throw $Error[0].Exception.Message | Send-Mail $ScriptAdmin $FailType
}
Make sure that your advanced-function which you created (like Import-Credentials above) contains the function name in the throw section. So we can filter it out in the catchblock.

Answer 1

Something like this, maybe?
Try {
$File = (Import-Csv -Path c:\test.csv)
if(!(Test-Path $LogFolder -PathType Container))
{ throw "Can't find the log folder: '$LogFolder'" }
$Credentials = Import-Credentials $UserName $PasswordFile
}
catch {
Switch -Wildcard ($Error[0].CategoryInfo)
{
'*[Import-CSV]*'
{ $FailType = 'Import CSV failed' }
'*[Test-Path]*'
{ $FailType = 'LogFolder not found' }
'*[Import-Credentials]*'
{ $FailType = 'Credential import failed' }
Default
{ $FailType = 'Unrecognized error' }
}
$Error[0].Exception.Message | Send-Mail $ScriptAdmin $FailType
}
Edit (for some reason I'm not able to post a comment):
I should have specified that it wasn't tested, and was intended more as a pattern than a finished solution, and it seems to have done what it was intended to do.
#BartekB - I habitually use $Error[0] instead of $_ because it seems more explicit and intuitive to read, and less likely to be misunderstood by someone less experienced who might inherit the code later.