c# arraylist

Questions & Answers
1

class msgclass
{
public string subject;
public string body;
}

        ArrayList MessageStorage = new ArrayList();
        msgclass msg = new msgclass();
        msg.subject = "subject";
        msg.body = "body";
        MessageStorage.Add(msg);

// how to access the msg?
// MessageStorage[0][0] doesn’t work
// MessageStorage[0].subject doesn’t work

2

Well, MessageStorage[0] does work, but the ArrayList stores only Object references. The compiler can’t determine what type you will store there at runtime so you would need to cast it to the right type.

Debug.Log(((msgclass)MessageStorage[0]).subject);

// or
msgclass tmp = (msgclass)MessageStorage[0];
Debug.Log(tmp.subject);

But you should avoid the ArrayList because the casting is quite slow. Use a generic List instead:

//Add this namespace
using System.Collections.Generic;

List<msgclass> MessageStorage = new List<msgclass>();
msgclass msg = new msgclass();
msg.subject = "subject";
msg.body = "body";
MessageStorage.Add(msg);

Debug.Log(MessageStorage[0].subject);

ps. class names should ALWAYS start with a capital letter and usually you use upper camel case so your class name should look like MsgClass