IEnumerable-Trie

C# implementation of a Trie (prefix tree) that is IEnumerable. You may conduct a prefix tree and not have to run on the trie all the way to it's end - just for the amount of results you need. This is perfect for autocomplete or any other scenario where you may want a fixed amount of results yielded in every search.

Usage

You can go ahead and use IEnumerableTrie.Trie. all you need to do is implement "IHasStringKeys" in the class you want to save in the Trie. example:

public class Stock : IHasStringKeys
    {
        public string Symbol { get; set; }
        public string Name { get; set; }
        public string LastSale { get; set; }
        public string MarketCap { get; set; }

        public string[] Keys { get { return new[] {Symbol.ToLower(), Name.ToLower()}; } }

        public override string ToString()
        {
            return String.Format("{0} ({1}). Last Sale: {2}, MarketCap: {3}", Name, Symbol, LastSale, MarketCap);
        }
    }

Once you did, you can create your Trie:

IEnumerable<Stock> stocks = LoadStocks("NasdaqCompanyList.csv");
Trie<Stock> trie = new Trie<Stock>(stocks);

// Search for a stock by prefix. as this is Ienumrable, we don't iterate over the Trie yet:
IEnumerable<Stock> results = trie.GetValuesByPrefix("micro");
// we only want the first 100, and will only iterate over the Trie until we find 100 max
foreach(var stock in results.Take(10))
{
    Console.WriteLine(stock);
}

There are a few Simple implementations ready to be used:

KeyValueTrie

A Trie that uses the key as an idex and store it's value. The key must be a string and the value could be of any type.

StringTrie

A Trie to store and search for strings.