StupidDictionary.cs

using System;
using System.Collections;
using System.Collections.Generic;

public class Foo
{
	public string OtherKey { get; set; }
}

public class StupidDictionary : IDictionary<string, Foo>
{
	private readonly Dictionary<string, Foo> _primaryDictionary;

	private readonly Dictionary<string, Foo> _secondaryDictionary;

	public StupidDictionary()
	{
		_primaryDictionary = new Dictionary<string, Foo>();
		_secondaryDictionary = new Dictionary<string, Foo>();
	}

	public IEnumerator<KeyValuePair<string, Foo>> GetEnumerator()
	{
		return _primaryDictionary.GetEnumerator();
	}

	IEnumerator IEnumerable.GetEnumerator()
	{
		return ((IEnumerable) _primaryDictionary).GetEnumerator();
	}

	public void Add(KeyValuePair<string, Foo> item)
	{
		((ICollection<KeyValuePair<string, Foo>>) _primaryDictionary).Add(item);
	}

	public void Clear()
	{
		_primaryDictionary.Clear();
	}

	public bool Contains(KeyValuePair<string, Foo> item)
	{
		return ((ICollection<KeyValuePair<string, Foo>>) _primaryDictionary).Contains(item);
	}

	public void CopyTo(KeyValuePair<string, Foo>[] array, int arrayIndex)
	{
		((ICollection<KeyValuePair<string, Foo>>) _primaryDictionary).CopyTo(array, arrayIndex);
	}

	public bool Remove(KeyValuePair<string, Foo> item)
	{
		return ((ICollection<KeyValuePair<string, Foo>>) _primaryDictionary).Remove(item);
	}

	public int Count
	{
		get { return _primaryDictionary.Count; }
	}

	public bool IsReadOnly
	{
		get { return false; }
	}

	public bool ContainsKey(string key)
	{
		return _primaryDictionary.ContainsKey(key);
	}

	public bool ContainsSecondaryKey(string key)
	{
		return _secondaryDictionary.ContainsKey(key);
	}

	public void Add(string key, Foo value)
	{
		_primaryDictionary.Add(key, value);
		_secondaryDictionary.Add(value.OtherKey, value);
	}

	public bool Remove(string key)
	{
		return _primaryDictionary.Remove(key);
	}

	public bool TryGetValue(string key, out Foo value)
	{
		return _primaryDictionary.TryGetValue(key, out value);
	}

	public Foo this[string key]
	{
		get { return _primaryDictionary[key]; }
		set { _primaryDictionary[key] = value; }
	}

	public ICollection<string> Keys
	{
		get { return _primaryDictionary.Keys; }
	}

	public ICollection<Foo> Values
	{
		get { return _primaryDictionary.Values; }
	}
}