Scope of static Variable in multi-user ASP.NET web

问题:

Does static variables retain their values across user sessions?

I have a ASP.NET web application where I have two buttons. One for setting the static variable value, another for Showing the static variable value.

namespace WebApplication1
{   

public partial class WebForm1 : System.Web.UI.Page
{
    public static int customerID;

    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void ButtonSetCustomerID_Click(object sender, EventArgs e)
    {
        customerID = Convert.ToInt32(TextBox1.Text);
    }

    protected void ButtonGetCustomerID_Click(object sender, EventArgs e)
    {
        Label1.Text = Convert.ToString(customerID);
    }
}

}

While this works in single-user environment, What happens if there are 2 users simultaneously logged in from two computers, User 1 sets the value as 100, then User 2 sets the value as 200. after that user 1 invokes the Get Value button. What will he see as the value?

回答1:

Does static variables retain their values across user sessions?

Yes, that's why you should be VERY careful when you use static variables in a web app. You will run in concurrency issues as more than one thread servicing a request can modify the value of the variable.

While this works in single-user environment, What happens if there are 2 users simultaneously logged in from two computers, User 1 sets the value as 100, then User 2 sets the value as 200. after that user 1 invokes the Get Value button. What will he see as the value?

The user will see 200 afterwards.

回答2:

Static Variables Scope is Application Level.

If you store something in Static variables, then your doing wrong thing.

If one user saves the data, Same time another user accessed the same page then he will also get the same data. So better you can store the values in Sessions.

回答3:

This would work for you (keep in mind, you need to handle null values/-1):

public static int customerID
{
    get { return session["customerID"] == null? -1 : (int)session["customerID"]; }
    set { session["customerID"] = value; }
}

回答4:

Do not use static for the property then it works:

public int customerID
{
    get { return Session["customerID"] == null? -1 : (int)Session["customerID"]; }
    set { Session["customerID"] = value; }
}