在asp.net中为每个用户存储不同的缓存值

Question

Cache.Insert("City", UserCity,
             null, System.Web.Caching.Cache.NoAbsoluteExpiration,
             new TimeSpan(24, 0, 0));

I want save cache for 24 hours for a particular user but whenever i open the page the same cache details are shown for all users. How do i differentiate for every user?

Answer 1

Ignoring considerations of whether or not it's a good idea, you can do this by including something that uniquely identifies the user, such as the userName, in the cache key:

string key = HttpContext.Current.User.Identity.Name + "-City";
Cache.Insert(key,...)

Putting user-specific data in the Cache is not scalable if you can have large numbers of users, but there may be some cases where it's appropriate. For example, it would be reasonable for a custom RoleProvider used in an Intranet application with a known upper limit on the number of concurrent users to store user-specific roles in Cache.