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Implementing Model-View-Presenter in ASP.NET

, 17 Nov 2007 CPOL 97K 2.6K 122
Three implementations of Model-View-Presenter in ASP.NET 2.0.
MVPSampleApp.zip
MVP.SampleApp
Lib
Microsoft.Practices.EnterpriseLibrary.Common.dll
Microsoft.Practices.EnterpriseLibrary.Data.dll
MySql.Data.dll
nunit.framework.dll
Rhino.Mocks.dll
Model
Data
Interfaces
Properties
Presentation
Presentation.Tests
Properties
Interfaces
Properties
SubSonic
ActiveRecord
Builder
CodeGeneration
Templates
CodeLanguage
Configuration
Controls
Calendar
lang
skin
active-bg.gif
calendar.gif
dark-bg.gif
hover-bg.gif
menuarrow.gif
normal-bg.gif
rowhover-bg.gif
status-bg.gif
title-bg.gif
today-bg.gif
Resources
DataProviders
Properties
Sql Tools
SubSonic.snk
Sugar
WebApp
App_Data
Views
SQL2000SampleDb.zip
SQL2000SampleDb.msi
using System;
using Model;
using Model.Data.Interfaces;
using Presentation.Interfaces;

namespace Presentation
{
	/// <summary>
	///		CustomersPresenter is the presenter in the event driven MVP relationship. 
	///		CustomersPresenter subscribes to events on its view and responds as
	///		necessary, telling the view what to do. It does not request information
	///		from the view, it only tell it what to do based on events raised by the view.
	/// 
	///		This MVP relationship is more of a Passive View.
	/// </summary>
	public class CustomersPresenter
	{
		private ICustomersView view = null;
		private IDomainDAO<ICustomer> model = null;

		// public event the ASPX page will register
		public event EventHandler<SingleValueEventArgs<string>> RequestCustomerEdit;

		public CustomersPresenter(ICustomersView view, IDomainDAO<ICustomer> model)
		{
			Check.IsNotNull(view, "view cannot be null");
			Check.IsNotNull(model, "model cannot be null");

			this.view = view;
			this.model = model;

			this.view.OnViewLoad += new EventHandler<SingleValueEventArgs<bool>>(OnViewLoadListener);
			this.view.RequestCustomerDetails += new EventHandler<SingleValueEventArgs<string>>(RequestCustomerDetailsListener);
			this.view.RequestCustomerEdit += new EventHandler<SingleValueEventArgs<string>>(RequestCustomerEditListener);
		}

		#region View Event Listeners
		private void OnViewLoadListener(object sender, SingleValueEventArgs<bool> isPostBack)
		{
			if (!isPostBack.Value)
			{
				// Set the view for the first time
				view.SetCustomers(model.FetchAllByName(true));
			}

			// Set this date on teh view every time
			view.SetRefreshTime(DateTime.Now);
		}

		private void RequestCustomerDetailsListener(object sender, SingleValueEventArgs<string> e)
		{
			// Set the view with updatd customer information
			string customerID = e.Value;
			ICustomer customer = model.FetchByID(customerID);
			view.SetCustomerDetails(customer);
		}

		private void RequestCustomerEditListener(object sender, SingleValueEventArgs<string> e)
		{
			// Raise our event. The ASPX page should be listening, but there is no guarantee.
			OnRequestCustomerEdit(e);
		}

		#endregion

		#region Presenter Raise Events
		/// <summary>
		///		Raise the RequestCustomerEdit event by invoking
		///		the delegates.
		/// </summary>
		public virtual void OnRequestCustomerEdit(SingleValueEventArgs<string> e)
		{
			EventHandler<SingleValueEventArgs<string>> eventHandler = RequestCustomerEdit;
			if (eventHandler != null)
			{
				eventHandler(this, new SingleValueEventArgs<string>(e.Value));
			}
		}
		#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

Alex Mueller
Web Developer
United States United States
No Biography provided

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