Using cache during user session

Question

I am using Outputcache in an Asp.net mvc5 application to cache a list in my application as follows :

[(Duration = 60, VaryByParam = "none")]
public ActionResult Index()
{}

I just need to take advantage of this cache while the user is logged in to the application. ie I’ll just upload the list again in the new user login.

how can I define this?

Answer 1

For this you can write your own rule for the cache using VaryByCustom.

In this case, you need to write the method GetVaryByCustomString will either return whether or not to use the cache based on Session. Assuming you have for example a session with the user login called "Login", you could do so:

[(Duration = 60, VaryByParam = "none" aryByCustom="SessionLogin")]
public ActionResult Index() {  }

And write this method in global.asax:

public override string GetVaryByCustomString(HttpContext context, string arg) 
{ 
  if(arg == "SessionLogin") 
  { 
    var login = context.Request.Session["Login"]; 
    if (login != null) 
      return login.ToString(); 
  } 
  return base.GetVaryByCustomString(context, arg); 
}