Question

Let’s say I have a dictionary that I want to store in the session. This dictionary will be storing a list of object with a date as the key.

Dictionary<DateTime, List<MyObjects>> SessionDictionaryMyObjects = new...

How do I put a list MyList in the dictionary with the key 31/1/2011 and how do I retrieve the list for 1/19/2011 from the dictionary?

Thanks.

Answer 1

Like this?

Dictionary<DateTime, List<MyObjects>> SessionDictionaryMyObjects = Session["SessionDictionaryMyObjects"] as Dictionary<DateTime, List<MyObjects>>;
if (SessionDictionaryMyObjects == null)
{
     Session["SessionDictionaryMyObjects"] = SessionDictionaryMyObjects = 
          new Dictionary<DateTime, List<MyObjects>>();
}

// Set value
SessionDictionaryMyObjects.Add(new DateTime(2011, 1, 31), yourListObject);

if (SessionDictionaryMyObjects.Contains(new DateTime(2011, 1, 19)))
{
    // Get value
    List<MyObjects> o = SessionDictionaryMyObjects[new DateTime(2011, 1, 19)];
}

You also should sheck if the value exists in the dictionary with ContainsKey method