ASP.net, adding objects to a session variable

Question

I'm trying to add an object(s) to a session variable across postbacks. My code looks similar to the following.

  Supply sup =  Supplies.GetSupply(supplyItemID);

  Session["CartObjects"] += sup;

Now, the compiler throws an error saying that the "+=" operator cannot be used on type 'object' and 'Supply'. Do I need to implement an interface on my Supply object that allows it to be added? Is this possible or am I thinking about this in the completely wrong way.

score 12 · Accepted Answer · answered Nov 08 '11 at 19:59

12

Try this:

Supply sup =  Supplies.GetSupply(supplyItemID); 
var cartObjects =  (Session["CartObjects"] as List<Supply>) ?? new List<Supply>();
cartObjects.Add(sup);
Session["CartObjects"] = cartObjects;

answered Nov 08 '11 at 19:59

Chandu

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score 7 · Answer 2 · answered Nov 08 '11 at 20:00

7

unless you are trying to create some sort of array the syntax is just

Session["CartObjects"] = sup;

answered Nov 08 '11 at 20:00

Gary.S

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Yes, actually a list/array of objects. Something along the lines of ((List)Session["CartObjects"]).Add(sup); – John Czajka Nov 08 '11 at 20:03

score 2 · Answer 3 · answered Nov 08 '11 at 20:01

No You dont need ,just Create a List of Supply and Save it in session

var supplyList = new List<Supply >();
Supply sup =  Supplies.GetSupply(supplyItemID);
supplyList.Add(sup);
Session["CartObjects"] =supplyList;

and 
and cast it as supply List
var list = Session["CartObjects"] as List<Supply >

ASP.net, adding objects to a session variable

3 Answers3

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