Cache Caching Elements in Razor MVC. How to do it?
How can I cache my items and values for a dropdown in MVC?
Is there a way to do this?
I am doing this in a controller.
Example code: .......
public ActionResult Index()
{
RegionTasks regionTasks = new RegionTasks();
ViewBag.Region = GetRegions();}
My controller has a function like 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 not cached item for scope.
How can i do this?
Darin is also right, however, I made the following code to store it on the 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;
}
The attribute is OutputCache
used for controller actions to cache the received result. This does not affect other methods.
If you want to cache custom objects, you can use 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;
}
regionTasks
are now keyed cached regions
and accessible from anywhere in your ASP.NET application that has access to HttpContext.Cache
.