// This function allows worker classes to write something that can be signaled to observers.
public void SendMessage(string message, string reason)
{
// Here we can perform some tests before sending the message
if (string.IsNullOrEmpty(reason))
{
throw new ArgumentNullException(nameof(reason));
}
if (MessageReceived == null)
{
return;
}
var printMessageArgs = new MessageArgs(message, reason);
OnMessageReceived(printMessageArgs);
}
protected virtual void OnMessageReceived(MessageArgs e)
{
// This raises our event observers listen to.
MessageReceived?.Invoke(this, e);
}
private static void PrinterOnMessageReceived(object sender, MessageArgs messageArgs)
{
Console.WriteLine($"Sender: {sender}{Environment.NewLine}" +
$"Message: {messageArgs.Message}{Environment.NewLine}" +
$"Reason: {messageArgs.Reason}{Environment.NewLine} ");
}