// Apply the deltas to mutate our state
public void Apply(InvoiceCreated @event)
{
Id = @event.InvoiceNumber.ToString(CultureInfo.InvariantCulture);
// Ensure to update version on every Apply method.
Version++;
}
public Invoice(int invoiceNumber)
{
if (invoiceNumber <= 0)
{
throw new ArgumentException("Invoice number needs to be positive", nameof(invoiceNumber));
}
// Instantiation creates our initial event, capturing the invoice number
var @event = new InvoiceCreated(invoiceNumber);
// Call Apply to mutate state of aggregate based on event
Apply(@event);
// Add the event to uncommitted events to use it while persisting the events to Marten events store
AddUncommittedEvent(@event);
}
// Apply the deltas to mutate our state
private void Apply(InvoiceCreated @event)
{
Id = @event.InvoiceNumber.ToString(CultureInfo.InvariantCulture);
}
