ChatClientForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.ServiceModel;
using System.ServiceModel.Channels;

namespace ChatClient
{
    // IChatService = our hosted interface
    public partial class ChatClientForm : Form
    {
        private ChatService _chatServer;

        // IChatChannel = channel for chat service
        private IChatChannel channel;

        // IChatChannel = channel for chat service
        private DuplexChannelFactory<IChatChannel> factory;

        public ChatClientForm()
        {
            InitializeComponent();

            _chatServer = new ChatService();

            this.AcceptButton = btnLogin;
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(txtUserName.Text.Trim()))
            {
                try
                {
                    _chatServer.NewJoin += ChatClient_NewJoin;
                    _chatServer.MessageSent += ChatClient_MessageSent;
                    _chatServer.RemoveUser += ChatClient_RemoveUser;

                    channel = null;

                    _chatServer.UserName = txtUserName.Text.Trim();

                    InstanceContext context = new InstanceContext(new ChatService());

                    // IChatChannel = channel for chat service
                    factory = new DuplexChannelFactory<IChatChannel>(context, "ChatEndPoint");
                    channel = factory.CreateChannel();

                    // IOnlineStatus = defines the properties and events
                    //                 used by network-enabled objects to indicate
                    //                 network availability.
                    IOnlineStatus status = channel.GetProperty<IOnlineStatus>();
                    status.Offline += new EventHandler(Offline);
                    status.Online += new EventHandler(Online);
                    channel.Open();
                    channel.Join(_chatServer.UserName);
                    grpMessageWindow.Enabled = true;
                    grpUserList.Enabled = true;
                    grpUserCredentials.Enabled = false;
                    this.AcceptButton = btnSend;
                    rtbMessages.AppendText("*****************************WEL-COME to Chat Application*****************************\r\n");
                    txtSendMessage.Select();
                    txtSendMessage.Focus();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
        }

        void ChatClient_RemoveUser(string name)
        {
            try
            {
                rtbMessages.AppendText("\r\n");
                rtbMessages.AppendText(name + " left at " + DateTime.Now.ToString());
                lstUsers.Items.Remove(name);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.ToString());
            }
        }

        void ChatClient_MessageSent(string name, string message)
        {
            if (!lstUsers.Items.Contains(name))
            {
                lstUsers.Items.Add(name);
            }
            rtbMessages.AppendText("\r\n");
            rtbMessages.AppendText(name + " says: " + message);
        }

        void ChatClient_NewJoin(string name)
        {
            rtbMessages.AppendText("\r\n");
            rtbMessages.AppendText(name + " joined at: [" + DateTime.Now.ToString() + "]");
            lstUsers.Items.Add(name);
        }

        void Online(object sender, EventArgs e)
        {
            rtbMessages.AppendText("\r\nOnline: " + _chatServer.UserName);
        }

        void Offline(object sender, EventArgs e)
        {
            rtbMessages.AppendText("\r\nOffline: " + _chatServer.UserName);
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            channel.SendMessage(_chatServer.UserName, txtSendMessage.Text.Trim());

            txtSendMessage.Clear();
            txtSendMessage.Select();
            txtSendMessage.Focus();
        }

        private void ChatClient_FormClosing(object sender, FormClosingEventArgs e)
        {
            try
            {
                if (channel != null)
                {
                    channel.Leave(_chatServer.UserName);
                    channel.Close();
                }
                if (factory != null)
                {
                    factory.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}