Ndtyjky

In my ASP.net application, multiple AJAX requests to the LoadPartialView controller action load the partial view directly inside the main view.

 public ActionResult LoadPartialView(string triggerParameter)

 {

        var myObject = GetData(triggerParameter);

        SaveObjectToSession(myObject);

        return PartialView("_PartialViewName", myObject);  

 }



 public void SaveObjectToSession(object myObject)

 {           

        _httpContextAccessor.HttpContext.Session.Set("objectKey", ValueToBytes(myObject));

 }

My intention is to reuse the data returned by each call to the LoadPartialView in another controller action. I am trying to do so using HttpContext.Session, but it doesn't seem to work.

  public ActionResult Details(string triggerParameter)

  {

        if (_httpContextAccessor.HttpContext.Session.Get(triggerParameter) == null)

        {

            return RedirectToAction(nameof(Index));

        }

        ....

  }

I have tried to use the lock statement in the LoadPartialView like this:

 private static readonly object Lock = new object();



 public ActionResult LoadPartialView(string triggerParameter)

 {

        lock(Lock) {

            var myObject = GetData(triggerParameter);

            SaveObjectToSession(myObject);

            return PartialView("_PartialViewName", myObject); 

        } 

 }

but it doesn't work either.

Is it possible to re-use the data returned by the partial view action method in another controller action without needing to make the request to: GetData() twice?

This answer explains that you cannot use Session with async calls, so you could implement your own cache, something like this:

public class MyController : Controller

{

    private static object _lock = new object();

    private static Dictionary<string, MyType> MyCache = new Dictionary<string, MyType>();



    public ActionResult Action1(string triggerParameter)

    {

        // get data in action1

        string userUniqueKey = GetUserId(); // <-- get a unique key for this user

        var myObject = GetDataFromCache(triggerParameter, userUniqueKey);

    }



    public ActionResult Action2(string triggerParameter)

    {

        string userUniqueKey = GetUserId(); // <-- get a unique key for this user

        var myObject = GetDataFromCache(triggerParameter, userUniqueKey);

    }



    // if data is already cached, get it from cache otherwise call GetData()

    private MyType GetDataFromCache(string triggerParameter, string userKey)

    {

        lock (_lock)

        {

            if (MyCache.Contains(userKey))

            {

                return MyChache[userKey]; 

            } 

            else 

            {

                myTypeObject = GetData(triggerParameter);      

                MyCache.Add(userKey, myObjectType);

                return myTypeObject;

            }

        }

    }

}