Advancing the Model-View-Presenter Pattern - Fixing the Common Problems

using System;
using System.Collections;
using System.Web;
using System.Web.SessionState;

using Sample.Presentation;

/// <summary>
/// WebSessionProvider wraps asp.net's session object for use with the MVP
/// pattern.  The presentation library shouldn't know about anything "downstram," 
/// which means no references to System.Web etc.  Because the class implements
/// ISessionProvider (in the Presentation project), state can still be maintained 
/// using the HttpSessionState object. 
/// </summary>
public class WebSessionProvider : ISessionProvider
{
    private HttpSessionState Session
    {
        get { return HttpContext.Current.Session; }
    }

    public void Add( string name, object value )
    {
        Session.Add(name, value);
    }

    public void Clear()
    {
        Session.Clear();
    }

    public bool Contains( string name )
    {
        return Session[name] != null;
    }

    #region ISessionProvider Members

    object ISessionProvider.this[string name]
    {
        get
        {
            return Session[name];
        }
        set
        {
            Session[name] = value;
        }
    }

    object ISessionProvider.this[int index]
    {
        get
        {
            return Session[index];
        }
        set
        {
            Session[index] = value;
        }
    }

    #endregion
}