Iterator design pattern example

gistfile1.cs

namespace DesignPatterns
{
    private static void IteratorTest()
	{
		IteratorExample example = new IteratorExample();
		foreach (string item in example)
		{
			Console.WriteLine(item);
		}
	}
		
	public class IteratorExample : IEnumerable
	{
		Dictionary<string, string> _dictionary;
		public IteratorExample()
		{
			// Add 5 names to a key/value pair list.
			_dictionary = new Dictionary<string, string>();
			_dictionary.Add("Hans", "Pisces");
			_dictionary.Add("Fred", "Aquarius");
			_dictionary.Add("Andrew", "Gemini");
			_dictionary.Add("Zach", "Scorpio");
			_dictionary.Add("Berfa", "Cancer");
		}
		
		/// <summary>
		/// Demonstrates yield with IEnumerable.
		/// </summary>
		public IEnumerator GetEnumerator()
		{
			// Sort by name
			var sorted = from d in _dictionary orderby d.Key select d;
			// Iterate through the sorted collection
			foreach (KeyValuePair<string, string> item in sorted)
			{
				yield return item.Key;
				yield return string.Format("({0})",item.Value);
			}
		}
	}
}