Cache dropbox items in MVC razor. How to do that? - asp.net-mvc-3

Question

How can i cache my items and values for dropdown list in MVC?
Is there a way to do so?
I am doing that in controller.
Sample code is.......
public ActionResult Index()
{
RegionTasks regionTasks = new RegionTasks();
ViewBag.Region = GetRegions();}
My controller has function as below.
[OutputCache(Duration = 10, Location = System.Web.UI.OutputCacheLocation.Server)]
private IEnumerable<SelectListItem> GetRegions()
{
RegionTasks regionTasks = new RegionTasks();
return regionTasks.GetRegions();
}
I have tested and it not caches the item for region.
How can i do that?

Answer 1

The OutputCache attribute is used on controller actions to cache the resulting output. It has strictly no effect on other methods.
If you want to cache custom objects you could use the HttpContext.Cache:
private IEnumerable<SelectListItem> GetRegions()
{
var regionTasks = HttpContext.Cache["regions"] as IEnumerable<SelectListItem>;
if (regionTasks == null)
{
// nothing in the cache => we perform some expensive query to
// fetch the result
regionTasks = new RegionTasks().GetRegions();
// and we cache it so that the next time we don't need to perform
// the query
HttpContext.Cache["regions"] = regionTasks;
}
return regionTasks;
}
The regionTasks are now cached under the regions key and accessible from anywhere in your ASP.NET application which has access to the HttpContext.Cache.

Answer 2

Darin is also right, how ever i have done following code to store on server for X minutes.
private IEnumerable<SelectListItem> GetGlobalUrlRegion(string profileName)
{
string cacheKey = "cacheUrlRegion";
RegionTasks regionTasks = RegionTasks.CreateRegionTasks();
IEnumerable<SelectListItem> regionUrlList = HttpContext.Cache[cacheKey] as IEnumerable<SelectListItem>;
if (regionUrlList == null)
{
var regionObject = regionTasks.GetRegions(profileName);
var cTime = DateTime.Now.AddMinutes(int.Parse(System.Configuration.ConfigurationSettings.AppSettings["GlobalCacheDurationInMin"].ToString()));
var cExp = System.Web.Caching.Cache.NoSlidingExpiration;
var cPri = System.Web.Caching.CacheItemPriority.Normal;
regionUrlList = regionObject;
HttpContext.Cache.Insert(cacheKey, regionObject, null, cTime, cExp, cPri, null);
}
return regionUrlList;
}