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Model View Presenter via .NET

, 10 Oct 2009
An article outlining an implementation of the Model View Presenter pattern in .NET, contrasting it with existing implementations of MVP, MVC, and using co-dependant interfaces to allow for abstract coordination.
ExampleProject.zip
ExampleProject.Contracts
bin
Debug
CobaltSoftware.Foundation.ModelViewPresenter.dll
ExampleProject.Contracts.dll
Properties
ExampleProject.Model
bin
Debug
CobaltSoftware.Foundation.ModelViewPresenter.dll
ExampleProject.Contracts.dll
ExampleProject.Model.dll
Properties
ExampleProject.Presenters
bin
Debug
CobaltSoftware.Foundation.ModelViewPresenter.dll
ExampleProject.Contracts.dll
ExampleProject.Presenters.dll
Properties
ExampleProject.Views
bin
Debug
CobaltSoftware.Foundation.ModelViewPresenter.dll
ExampleProject.Contracts.dll
ExampleProject.Views.dll
Properties
CobaltSoftware.Foundation.ModelViewPresenter
bin
Debug
CobaltSoftware.Foundation.ModelViewPresenter.dll
Core
Properties
Support
ExampleProject.Application
bin
Debug
CobaltSoftware.Foundation.ModelViewPresenter.dll
ExampleProject.Application.exe
ExampleProject.Application.vshost.exe
ExampleProject.Application.vshost.exe.manifest
ExampleProject.Contracts.dll
ExampleProject.Model.dll
ExampleProject.Presenters.dll
ExampleProject.Views.dll
Properties
Settings.settings
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ExampleProject.Contracts;
using System.ComponentModel;
using System.Timers;
using System.Globalization;

namespace ExampleProject.Model
{
    /// <summary>
    ///     The TimeModel represents a model of date/time with
    ///     internationalization, and provides a simple implementation
    ///     of date/time management, with a periodic tick event
    ///     that notifies listeners of changes in the current time.
    /// </summary>
    /// <remarks>
    ///     <para>
    ///         <list>
    ///             <listheader>Version History</listheader>
    ///             <item>10 October, 2009 - Steve Gray - Initial Draft</item>
    ///         </list>
    ///     </para>
    /// </remarks>
    public class TimeModel : ITimeModel
    {
        #region Private Fields

        private TimeZoneInfo _TimeZone;
        private DateTime _Time;
        private Timer _Timer;

        #endregion

        #region Constructor(s)

        /// <summary>
        ///     Initialize the time model.
        /// </summary>
        public TimeModel()
        {
            _TimeZone = TimeZoneInfo.Local;
            _Time = DateTime.Now;
            _Timer = new Timer(1000);
            _Timer.Elapsed += new ElapsedEventHandler(Timer_Elapsed);
            _Timer.Start();
        }

        #endregion

        #region Timer Update

        /// <summary>
        ///     When the timer elapses, update the current time.
        /// </summary>
        /// <param name="sender">Sending object</param>
        /// <param name="e">Event arguments</param>
        void Timer_Elapsed(object sender, ElapsedEventArgs e)
        {
            // Set the current time to the right internationalized time.
            _Time = TimeZoneInfo.ConvertTime(DateTime.Now, _TimeZone);
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("CurrentTime"));
        }

        #endregion


        #region ITimeModel Members

        /// <summary>
        ///     Current time-zone
        /// </summary>
        public TimeZoneInfo CurrentTimezone
        {
            get
            {
                return _TimeZone;
            }
            set
            {
                if (CurrentTimezone != value)
                {
                    _TimeZone = value;
                    if (PropertyChanged != null)
                        PropertyChanged(this, new PropertyChangedEventArgs("CurrentTimezone"));
                }
            }
        }

        /// <summary>
        ///     Current time
        /// </summary>
        public DateTime CurrentTime
        {
            get 
            {
                return _Time;
            }
        }

        #endregion

        #region INotifyPropertyChanged Members

        /// <summary>
        ///     Notify listeners of property changes (using Observer pattern).
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;

        #endregion

        #region ITimeModel Members

        /// <summary>
        ///     List of time-zones
        /// </summary>
        public IEnumerable<TimeZoneInfo> AllTimeZones
        {
            get {
                return TimeZoneInfo.GetSystemTimeZones();
            }
        }

        #endregion
    }
}

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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

Steven James Gray
Software Developer (Senior) Insurance Industry
United Kingdom United Kingdom
Steve Gray is a Senior Developer at a British insurance company, working on a popular aggregator. When he's not writing ASP .NET, it's because there's SQL or WCF to write instead.

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