Powershell: Exception Analysis


I’v been having some trouble catching the correct Exception object in a try/catch-block.



Standard try/catch-block

try {
} catch [Exception] {

Create a test script to generate the exception again.

Use a standard try/catch-block to manipulate the exception object.
Read the exception object type from the “Exception” property and the exceptions code from the “ErrorCode” property

try {
    New-ADGroup -Name "Test" -Path "OU=Groups,DC=company,DC=com"
} catch {
    $_ | fl "Exception" -f
    $_.Exception | fl "ErrorCode" -f

Exception : Microsoft.ActiveDirectory.Management.ADException: The specified group already exists
ErrorCode : 1318

So the full name of an exception generated by Active Directory is Microsoft.ActiveDirectory.Management.ADException and the ErrorCode for the exception that gets thrown when the specified group already exists is 1318.


This try/catch-block catches any Microsoft.ActiveDirectory.Management.ADException but will throw it up again if it is not the exception with ErrorCode 1318

try {
    New-ADGroup -Name "Test" -Path "OU=Groups,DC=company,DC=com"
} catch [Microsoft.ActiveDirectory.Management.ADException] {
    if($_.Exception.ErrorCode -eq 1318){
        #The specified group already exists
    } else {

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