StackOverflow2013

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copied!<p>I would suggest that your listener has no knowledge about how the messages are to be presented. Instead, expose an event that the form can listen to:</p> <pre><code>// event args class for transmitting the message in the event public class MessageEventArgs : EventArgs { public IMessage Message { get; private set; } public MessageEventArgs(IMessage message) { Message = message; } } </code></pre> <p>In your listener class:</p> <pre><code>public class MyListener : IMessageListener { public event EventHandler<MessageEventArgs> MessageReceived; public void MessageTransfer(IMessage m) { OnMessageReceived(new MessageEventArgs(m)); } protected void OnMessageReceived(MessageEventArgs e) { EventHandler<MessageEventArgs> temp = MessageReceived; if (temp != null) { temp(this, e); } } } </code></pre> <p>Now you can add an event listener in your form and add the message information to a listbox or any other kind of control you like.</p> <p><strong>Update</strong><br> Here is an example on how to hook up the event handler in the form. This code makes two assumptions:</p> <ul> <li>The event <code>MessageReceived</code> is defined in the <code>IMessageListener</code> interface</li> <li>The <code>IMessage</code> interface has a property called <code>Text</code>.</li> </ul> <p>Code sample:</p> <pre><code>public partial class MainUI : Form { private IMessageListener _messageListener; public MainUI() { InitializeComponent(); _messageListener = new MyListener(); _messageListener.MessageReceived += MessageListener_MessageReceived; } void MessageListener_MessageReceived(object sender, MessageEventArgs e) { _messageListBox.Items.Add(e.Message.Text); } } </code></pre>

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