CODEWITHSUNDEEP
vb.netpowershellexceptionerror-handling
Ben
Ben

Reputation: 1032

How to trap an Unhandled Error in PowerShell

I'm trying to handle an exception error caused when the wrong user name and password is used with the Microsoft Online PowerShell cmdlets (from within in an ASP.NET website). Here's a snipped of the code:

PowerShell.Runspace = myRunSpace

Dim connect As New Command("Get-MSOnlineUser")
connect.Parameters.Add("Enabled")

Dim secureString As New System.Security.SecureString()
Dim myPassword As String = "Password"

For Each c As Char In myPassword
        secureString.AppendChar(c)
Next

connect.Parameters.Add("Credential", New PSCredential("[email protected]", secureString))
PowerShell.Commands.AddCommand(connect)

Dim results As Collection(Of PSObject) = Nothing
Dim errors As Collection(Of ErrorRecord) = Nothing

results = PowerShell.Invoke()

Try
        results = PowerShell.Invoke()
Catch ex As Exception

End Try

errors = PowerShell.Streams.[Error].ReadAll()

If I remove the Try/Catch block, I get an Unhandled Exception error: Credentials are not valid. Check the user name and password and try again. However, with the Try/Catch block, neither the results or errors collections contain anything.

How do I trap this error properly so I can present the user with "Invalid Username or Password"?

Upvotes: 1

Views: 8700

Answers (1)

Arcass
Arcass

Reputation: 932

What you are looking for is:

$_.Exception.Message

This variable holds the latest exception error. So in pure PowerShell I do my error handling like:

try
{
   #Some cmdlet likely to throw exception
}
catch [system.exception]
{
   Write-host "Exception String:"+$($_.Exception.Message)"
   #do some error handling
}

regards Arcass

Upvotes: 4

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