C＃会话变量/应用程序范围的变量

Question

I'm new to C# from ColdFusion and I'm trying to replicate an application I have developed in CF to help me get an understanding of the language.

My application logs a user in and searches and buys virtual items.

In my CF app, when a user logs in I set a session variable called loggedIn which is true .

Each search/buy request can only be made whilst this session variable is true . If a request returns a expired session response from the host then I update session.loggedIn = false . A new login request is then made.

How would I achieve this in C# so that I don't need to pass it to and return it from each class/method that it interacts with?

Basically, in CF I can set and access it from anywhere within the application but is this achievable in C#?

Answer 1

Your logged session could be a class that you instantiate when the user logs in, an that you invalidate/destroy when it expires.

Then you shoul move the relevant methods inside that class, so they can always be executed because they only exist within the scope of the active session.

Answer 2

If you simply want to set a session value, then you can use the Session property, which is available to a WebForm, or Controller (it's not clear if you're using WebForms or MVC).

Either way, using that proeprty is the same for both eg

Writing

Session["loggedIn"] = true;

Reading

bool isLoggedIn = Convert.ToBoolean(Session["loggedIn"]);

I suggest you create a property on your WebForm/Controlle to wrap this functionality eg

public bool UserIsLoggedIn
{
    get
    {
        if (Session["loggedIn"] != null)
        {
            return Convert.ToBoolean(Session["loggedIn"]);
        }

        return false;
    }
    set
    {
        Session["loggedIn"] = value;
    }
}