ASP.NET Passing values between classes using interface

Question

Hi guys,

I usually use STATIC implementation when developing Desktop Application and I just got my head bumped on the wall when I use STATIC in ASP.NET (not a good idea)

I think I saw some feedback here before that you can use INTERFACE for passing values between Classes and Pages without using Session.

Can you guys give a good example on how to implement my question? Thanks

here's my sample code

public interface ISessionManager
{
    SessionStates sesState { get; set; }
}

public struct SessionStates
{
    public string SessionID;
    public bool isLoggedIn;
    public string Username;
}

Answer 1

Use Session state objects,

Session["variable_name"] = assign any value in one class and use this session state object in any other class.

For example,

using System.Web.SessionState;

//Store the value in the session state object in one class

Session["sessionid"]=Request.QueryString.Get("session_key").ToString();

//Use the session state object in another class

String sessionid=Session["sessionid"].ToString();

Answer 2

Anyway, I decided to do it in another way and I called it SessionManager. I just want to get out of typing the Session variable name everytime I have to use it and this is to prevent some mistyping the session variable name .. so this I what I came up.

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

public class SessionManager : IRequiresSessionState
{
    public SessionManager()
    {
    }

    string _sessionID = string.Empty;
    public string SessionID
    {
        get
        {
            if (Get("SessionID") == null) Save("SessionID", string.Empty);
            return Get("SessionID").ToString();
        }
        set
        {
            this._sessionID = value;
            Save("SessionID", value);
        }
    }

    bool _isLoggedIn = false;
    public bool isLoggedIn
    {
        get
        {
            if (Get("isLoggedIn") == null) Save("isLoggedIn", false);
            return Convert.ToBoolean(Get("isLoggedIn").ToString());
        }
        set
        {
            this._isLoggedIn = value;
            Save("isLoggedIn", value);
        }
    }

    string _username = string.Empty;
    public string Username
    {
        get
        {
            if (Get("Username") == null) Save("Username", string.Empty);
            return Get("Username").ToString();
        }
        set
        {
            this._username = value;
            Save("Username", value);
        }
    }

    int _selectedCID = 0;
    public int SelectedCID
    {
        get
        {
            if (Get("SelectedCID") == null) Save("SelectedCID", 0);
            return Convert.ToInt32(Get("SelectedCID"));
        }
        set
        {
            this._selectedCID = value;
            Save("SelectedCID", value);
        }
    }

    string _selectedCIDValPath = string.Empty;
    public string SelectedCIDValPath
    {
        get
        {
            if (Get("SelectedCIDValPath") == null) Save("SelectedCIDValPath", 0);
            return Get("SelectedCIDValPath").ToString();
        }
        set
        {
            this._selectedCIDValPath = value;
            Save("SelectedCIDValPath", value);
        }
    }

    #region methods
    void Save(string name, object value)
    {
        if (HttpContext.Current.Session[name] != null)
        {
            HttpContext.Current.Session[name] = value;
        }
        else
        {
            HttpContext.Current.Session.Add(name, value);
        }
    }
    object Get(string name)
    {
        return HttpContext.Current.Session[name];
    }
    #endregion
}