Dictionary with list of strings as value

Question

I have a dictionary where my value is a List. When I add keys, if the key exists I want to add another string to the value (List)? If the key doesn\'t exist then I create a

Answer 1

I'd wrap the dictionary in another class:

public class MyListDictionary
{

    private Dictionary> internalDictionary = new Dictionary>();

    public void Add(string key, string value)
    {
        if (this.internalDictionary.ContainsKey(key))
        {
            List list = this.internalDictionary[key];
            if (list.Contains(value) == false)
            {
                list.Add(value);
            }
        }
        else
        {
            List list = new List();
            list.Add(value);
            this.internalDictionary.Add(key, list);
        }
    }

}