/// <summary>
/// Removes all value entries whose corresponding Runspace has been destroyed
/// </summary>
public void PurgeExpired()
{
// Store IDs first, so parallel access is not an issue and a new value gets accidentally discarded
Guid[] IDs = Values.Keys.ToArray();
ICollection <System.Management.Automation.Runspaces.Runspace> runspaces = UtilityHost.GetRunspaces();
ICollection <Guid> runspaceIDs = (ICollection <Guid>)runspaces.Select(o => o.InstanceId);
foreach (Guid ID in IDs)
{
if (!runspaceIDs.Contains(ID))
{
Values.Remove(ID);
}
}
}