Question

I am using a Asp.Net MVC application.

In the following code how can I avoid the two database calls for populating a dropdown?

[HttpGet]
public ActionList Upload(){

// do something
//For populating drop downlist take data from db

Return View("Upload");

}

[HttpPost]
public ActionList Upload(){

//do something
//again take data from db for populating dropdown

Return View("Upload");

}

Any other way than jQuery ajax method? Thanks

Answer 1

It depends on the size of the data and how often it’s likely to change, but a common solution is just to use the HttpContext’s Cache property.

public List<items> GetDropdownlistItems()
{
    string cacheKey = "dropdownlistItems";

    if (HttpContext.Current.Cache[cacheKey] != null)
    {
        return (List<items>)HttpContext.Current.Cache[cacheKey];
    }

    var items = GetItemsFromDatabase();

    HttpContext.Current.Cache.Insert(cacheKey, items, null, DateTime.Now.AddHours(1), System.Web.Caching.Cache.NoSlidingExpiration);

    return items;
}