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Hosting WCF services in a Windows Forms Application

, 8 Nov 2006
Demonstrates how to host serveral singleton services in a Windows Forms application.
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 DCCLocomotiveFactory
{
    public partial class LocoControlForm : Form
    {
        ChannelFactory<IDCCLocomotiveChannel> m_dccLocoFactory;
        IDCCLocomotiveChannel m_locoChannel = null;

        DCCLocomotiveService m_current = new DCCLocomotiveService();
        UpdateDisplayManager m_displayMgr = null;

        public LocoControlForm(string address, string name, bool canUpdate)
        {
            InitializeComponent();

            m_displayMgr = new UpdateDisplayManager(this, canUpdate);
           
            try
            {
                labelName.Text = name;
                labelAddress.Text = address;

                EndpointAddress endPoint = new EndpointAddress(
                    new Uri(string.Format(Constants.LocoServerBaseAddress, address) + address));
                System.ServiceModel.Channels.Binding binding = new NetTcpBinding();
                m_dccLocoFactory = new ChannelFactory<IDCCLocomotiveChannel>(binding, endPoint);
                m_dccLocoFactory.Open();

                m_locoChannel = m_dccLocoFactory.CreateChannel();

                m_locoChannel.Open();

                //UpdateLocoDisplay();
                m_displayMgr.Update();

                updateTimer.Start();
            }
            catch (Exception)
            {
                MessageBox.Show("Cannot connect to locomotive with address: " + address);
                this.Close();
            }
        }


        #region Accessors used by the UpdateDisplayManager class
        public IDCCLocomotiveContract CurrentLoco
        {
            get
            {
                return m_current;
            }
        }

        public IDCCLocomotiveContract RemoteLoco
        {
            get
            {
                return m_locoChannel;
            }
        }

        public NumericUpDown SpeedControl
        {
            get
            {
                return numericUpDownSpeed;
            }
        }

        public CheckBox LightControl
        {
            get
            {
                return checkBoxLight;
            }
        }

        public ComboBox DirectionControl
        {
            get
            {
                return comboBoxDirection;
            }
        }

        public Label SpeedLabel
        {
            get
            {
                return labelSpeed;
            }
        }

        public Label DirectionLabel
        {
            get
            {
                return labelDirection;
            }
        }

        public Label LightLabel
        {
            get
            {
                return labelLight;
            }
        }

        public Button UpdateButton
        {
            get
            {
                return btnChange;
            }
        }
        #endregion


        #region Event handlers
        protected override void OnClosed(EventArgs e)
        {
            try
            {

                if (m_locoChannel != null)
                    m_locoChannel.Close();

                if (m_locoChannel != null)
                    m_dccLocoFactory.Close();

                updateTimer.Stop();
            }
            catch (Exception)
            {
            }

            base.OnClosed(e);
        }

        private void checkBoxLight_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBoxLight.Checked)
                checkBoxLight.Text = "On";
            else
                checkBoxLight.Text = "Off";
        }

        private void btnChange_Click(object sender, EventArgs e)
        {
            try
            {
                m_locoChannel.SetSpeed((byte)numericUpDownSpeed.Value);
                m_locoChannel.SwitchLight(checkBoxLight.Checked);
                m_locoChannel.ChangeDirection(((string)comboBoxDirection.SelectedItem) == "Forward" ? Direction.Forward : Direction.Reverse);
            }
            catch (Exception)
            {
            }
        }

        private void updateTimer_Tick(object sender, EventArgs e)
        {
            // Check if anything changed in the loco
            try
            {
                if (NewLocoData(m_current, m_locoChannel))
                    m_displayMgr.Update();
                    //UpdateLocoDisplay();
            }
            catch (Exception)
            {
            }
        }
        #endregion

        private bool NewLocoData(IDCCLocomotiveContract current, IDCCLocomotiveContract newData)
        {
            bool bRet = false;

            if (current.GetSpeed() != newData.GetSpeed())
            {
                bRet = true;
            }
            else if (current.GetLightState() != newData.GetLightState())
            {
                bRet = true;
            }
            else if (current.GetDirection() != newData.GetDirection())
            {
                bRet = true;
            }

            return bRet;
        }
    }


    /// <summary>
    /// This class is used to update the display with values read
    /// from the IDCCLocomotiveChannel
    /// </summary>
    class UpdateDisplayManager
    {
        private bool m_canUpdate;
        private LocoControlForm m_form;

        public UpdateDisplayManager(LocoControlForm form, bool canUpdate)
        {
            m_canUpdate = canUpdate;
            m_form = form;

            if (!canUpdate)
                m_form.Text = "Locomotive Monitor";

            m_form.DirectionControl.Visible = canUpdate;
            m_form.DirectionLabel.Visible = !canUpdate;
            m_form.LightControl.Visible = canUpdate;
            m_form.LightLabel.Visible = !canUpdate;
            m_form.SpeedControl.Visible = canUpdate;
            m_form.SpeedLabel.Visible = !canUpdate;
            m_form.UpdateButton.Visible = canUpdate;
        }

        public void Update()
        {
            m_form.CurrentLoco.SwitchLight(m_form.RemoteLoco.GetLightState());
            m_form.CurrentLoco.SetSpeed(m_form.RemoteLoco.GetSpeed());
            m_form.CurrentLoco.ChangeDirection(m_form.RemoteLoco.GetDirection());

            string direction = m_form.CurrentLoco.GetDirection().ToString();

            if (m_canUpdate)
            {
                m_form.SpeedControl.Value = (decimal)m_form.CurrentLoco.GetSpeed();
                m_form.DirectionControl.SelectedItem = direction;
                m_form.LightControl.Checked = m_form.CurrentLoco.GetLightState();
            }
            else
            {
                m_form.SpeedLabel.Text = m_form.CurrentLoco.GetSpeed().ToString();
                m_form.DirectionLabel.Text = direction;
                m_form.LightLabel.Text = m_form.CurrentLoco.GetLightState() ? "On" : "Off";
            }
        }
    }

/// <summary>
/// Interface used to create the Proxy for IDCCLocomotiveContract
/// </summary>
interface IDCCLocomotiveChannel : IDCCLocomotiveContract, IClientChannel
{
}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

orouit
Architect Consistel - Singapore
Singapore Singapore
Software Architect, COM, .NET and Smartcard based security specialist.
 
I've been working in the software industry since I graduated in Electrical and Electronics Engineering. I chose software because I preferred digital to analog.
 
I started to program with 6802 machine code and evolved to the current .NET technologies... that was a long way.
 
For more than 20 years I have always worked in technical positions as I simply like to get my hands dirty and crack my brain when things don't go right!
 
After 12 years in the smart card industry I can claim a strong knowledge in security solutions based on those really small computers! I'm currently back in the business to design the licensing system for the enterprise solution I'm currenly working on, using a .NET smart card (yes they can run .NET CLR!)
 
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