Access External Value Store from PowerShell Script

A PowerShell connector script can access the external value store through its $components object. Use GetExternalValue when the key is required:

$value = $components.GetExternalValue("keyName").Value;

Use TryGetExternalValue when a value is optional or the script should handle a missing key:

$externalValue = $null

if ($components.TryGetExternalValue("keyName", [ref]$externalValue)) {
    $value = $externalValue.Value
} else {
    $value = "fallback"
}

These methods work in both in-process and out-of-process PowerShell execution.