Created
February 15, 2017 17:39
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Testing throwing custom exceptions
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| # Generate a custom error without C# | |
| function New-ErrorRecord ([string] $ErrorID, [string] $Message, [HashTable] $Custom) | |
| { | |
| $errorCategory = [Management.Automation.ErrorCategory]::InvalidResult | |
| $exception = New-Object Exception $Message | |
| $errorRecord = New-Object Management.Automation.ErrorRecord $exception, $ErrorID, $errorCategory, $Custom | |
| return $errorRecord | |
| } | |
| # Helper functions throw errors | |
| function Do-Something | |
| { | |
| throw (New-ErrorRecord -ErrorID "MyModule.Friday" -Message "You probably shouldn't do this today.") | |
| } | |
| function Do-SomethingElse | |
| { | |
| throw (New-ErrorRecord -ErrorID "MyModule.Whoops" -Message "Well that sucked." -Custom @{Prefix = "Whoops"}) | |
| } | |
| function Do-SomethingAweful | |
| { | |
| throw [System.Exception] "This should cause terminating error" | |
| } | |
| function Do-SomethingAweful2 | |
| { | |
| throw "This should cause terminating error" | |
| } | |
| function Do-SomethingDifferent | |
| { | |
| throw [System.FormatException] "That format sucks :(" | |
| } | |
| # Main function calls helpers and handles exceptions | |
| function Main($helper) | |
| { | |
| try | |
| { | |
| . $helper | |
| } | |
| # More specific Exceptions must be caught first | |
| catch [System.FormatException] | |
| { | |
| Write-Host $_.Exception.Message -ForegroundColor Yellow | |
| } | |
| catch [System.Exception] | |
| { | |
| # List of my Custom Errors, If logic below to handle | |
| $CustomErrors = @("MyModule.Friday","MyModule.Whoops") | |
| # Rethrow if not one of my custom errors | |
| if($_.FullyQualifiedErrorId -notin $CustomErrors) | |
| { | |
| throw $_.Exception | |
| } | |
| # Custom Output | |
| $message = $_.Exception.Message | |
| if($_.TargetObject.Prefix) | |
| { | |
| $message = "{0}: {1}" -f $_.TargetObject.Prefix, $_.Exception.Message | |
| } | |
| Write-Host $message -ForegroundColor Cyan | |
| } | |
| } | |
| # Call contrived main function | |
| cls | |
| Main Do-Something | |
| Main Do-SomethingElse | |
| Main Do-SomethingDifferent | |
| Main Do-SomethingAweful | |
| Main Do-SomethingAweful2 |
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