c# - ASP .NET Singleton

Question

Just want to make sure I am not assuming something foolish here, when implementing the singleton pattern in an ASP .Net web application the static variable scope is only for the current user session, right? If a second user is accessing the site it is a different memory scope...?

Answer 1

Static members have a scope of the current worker process only, so it has nothing to do with users, because other requests aren't necessarily handled by the same worker process.

• In order to share data with a specific user and across requests, use HttpContext.Current.Session.
• In order to share data within a specific request, use HttpContext.Current.Items.
• In order to share data across the entire application, either write a mechanism for that, or configure IIS to work with a single process and write a singleton / use Application.

By the way, the default number of worker processes is 1, so this is why the web is full of people thinking that static members have a scope of the entire application.