How to assign a dictionary value to a session in asp.net?

Question

I have a function that assigns values to a dictionary created in c#. After some computations in the function, the dictionary is compsed of a value and a key. I need to create a session save this dictionary in this session. Can anybody help?

You mean you want to create a dictionary of sessions? Please elaborate. — Nikhil Agrawal
– Nikhil Agrawal, Commented Sep 11, 2012 at 8:09
Session itself is a kind of dictionary, too, really - a series of values accessed by key. Are you looking to do something like this - stackoverflow.com/questions/4853403/… ? — dash
– dash, Commented Sep 11, 2012 at 8:09
You can store your dictionary in the Session Dictionary. I think you need to read some about asp.net cache, because store a Dictorionary in a Session, sounds like a chance of cache. — Alberto León
– Alberto León, Commented Sep 11, 2012 at 8:12
No the dictionary is compased of string and List<int>. I just need to add this dictianry to a session — Hanady
– Hanady, Commented Sep 11, 2012 at 8:12
@HanadyDaccache: What dash said is that you also could use the Session itself. For example: Session.Add("Item1",list1);Session.Add("Item2",list2); and get the items var list1 = (List<int>)Session["Item1"];. The only difference is that the session is not strongly typed. — Tim Schmelter
– Tim Schmelter, Commented Sep 11, 2012 at 8:21

Community · Accepted Answer · 2017-05-23 12:16:55Z

Put simply, if you have a Dictionary<string, List<int>> then putting it in the session is not very complicated;

Dictionary<string, List<int>> myDict = new Dictionary<string, List<int>>();
HttpContext.Current.Session.Add("MyDictionary", myDict);

If you want to check if the Session already contains your dictionary, and only add it if it doesn't then:

if(!HttpContext.Current.Session.ContainsKey("MyDictionary"))
{
    HttpContext.Current.Session.Add("MyDictionary", myDict);
}

To get it out, remember that it's not typed, Session is effectively a dictionary of string, object so you'll have to cast:

if(HttpContext.Current.Session.ContainsKey("MyDictionary"))
{
    Dictionary<string, List<int>> myDict = HttpContext.Current.Session["MyDictionary"] as Dictionary<string, List<int>>;
}

However, you should also consider what the lifecycle of this object is going to be - Session is not stable in that it has a finite lifetime - it will disappear after a predetermined time of inactivity, for example, so if you want it to hang around for a longer time then you may need to consider alternative strategies.

There's a ton of documentation on Session over at MSDN and it's also a very common topic on Stack Overflow.

Remember also that, as Session is effectively a Dictionary<String, Object> managed by the .Net Framework and IIS, you could also do:

Session["MyValues"] = new List<Int32>();

And, of course, on retrieval:

List<Int32> myValues = Session["MyValues"] as List<Int32>();

Other alternatives include the Cache; if your object is going to be available to all users of the application then this might be a better solution. Please see this answer for more information.

I've also voted to close your question as I believe it's too localized, but I hope my answer helps you along the way.

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