Question

I’m trying to hold a lobby system inside of a dictionary.

private Dictionary<string, Dictionary<string, string>> lobbys;

The first string being the Lobby ID, and the dictionary within the dictionary holding the clients usernames in the lobby.

When I try to create a new ‘lobby’ in the dictionary like so:

lobbys.Add("dSd244SfasdD", null);

( the “dSd244SfasdD” being the unique lobby ID, and null being the null dictionary I’ve yet to create (since theres no users in it yet))

I get this error: “Object referenced not set to an instance of an object.”

I’m unsure as to what I’m doing wrong, and I’m fairly new to C#. Please help. Thanks 🙂

Answer 1

You must first instantiate the lobbys Dictionary (which holds the Dictionaries):

lobbys = new Dictionary<string, Dictionary<string, string>>();

Then you can add to this lobbys, and when you do so, you should instantiate those inner dictionaries.

lobbys.Add("dsD244SfasD", new Dictionary<string, string>());

Then, when you add to those inner dictionaries:

lobbys["dsD244fasD"].Add("Client1", "Bob Jones");
lobbys["dsD244fasD"].Add("Client2", "Bill James");