Powershell throw exceptions with data

Question

How to use 'throw' direction in PowerShell to throw an exception with custom data object? Say, could it do this?:

throw 'foo', $myData

then the data can be used in 'catch' logic:

catch {
    if ($_.exception.some_property -eq 'foo') {
        $data = $_.exception.some_field_to_get_data
        # dealing with data
    }
}

edited:
My intention is to know is there a brief and cool syntax to throw an exception (without explicitly creating my own type) with a name that I can decide by its name and deal with its data in the 'catch' blocks.

Answer 1

You can throw any kind of System.Exception instance (here using a XamlException as an example):

try {
    $Exception = New-Object System.Xaml.XamlException -ArgumentList ("Bad XAML!", $null, 10, 2)
    throw $Exception
}
catch{
    if($_.Exception.LineNumber -eq 10){
        Write-Host "Error on line 10, position $($_.Exception.LinePosition)"
    }
}

---

If you're running version 5.0 or newer of PowerShell, you can use the new PowerShell Classes feature to define custom Exception types:

class MyException : System.Exception
{
    [string]$AnotherMessage
    [int]$SomeNumber

    MyException($Message,$AnotherMessage,$SomeNumber) : base($Message){
        $this.AnotherMessage = $AnotherMessage
        $this.SomeNumber     = $SomeNumber
    }
}

try{
    throw [MyException]::new('Fail!','Something terrible happened',135)
}
catch [MyException] {
    $e = $_.Exception
    if($e.AnotherMessage -eq 'Something terrible happened'){
        Write-Warning "$($e.SomeNumber) terrible things happened"
    }
}