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    <p>I wrote an LRU Cache and some test cases, feel free to use it.</p> <p>You can read through the source on <a href="http://samsaffron.com/archive/2009/08/21/Behaviour+driven+design+using+rspec+IronRuby+and+C" rel="noreferrer">my blog</a>.</p> <p>For the lazy (here it is minus the test cases): </p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace LRUCache { public class IndexedLinkedList&lt;T&gt; { LinkedList&lt;T&gt; data = new LinkedList&lt;T&gt;(); Dictionary&lt;T, LinkedListNode&lt;T&gt;&gt; index = new Dictionary&lt;T, LinkedListNode&lt;T&gt;&gt;(); public void Add(T value) { index[value] = data.AddLast(value); } public void RemoveFirst() { index.Remove(data.First.Value); data.RemoveFirst(); } public void Remove(T value) { LinkedListNode&lt;T&gt; node; if (index.TryGetValue(value, out node)) { data.Remove(node); index.Remove(value); } } public int Count { get { return data.Count; } } public void Clear() { data.Clear(); index.Clear(); } public T First { get { return data.First.Value; } } } } </code></pre> <p>LRUCache</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace LRUCache { public class LRUCache&lt;TKey, TValue&gt; : IDictionary&lt;TKey, TValue&gt; { object sync = new object(); Dictionary&lt;TKey, TValue&gt; data; IndexedLinkedList&lt;TKey&gt; lruList = new IndexedLinkedList&lt;TKey&gt;(); ICollection&lt;KeyValuePair&lt;TKey, TValue&gt;&gt; dataAsCollection; int capacity; public LRUCache(int capacity) { if (capacity &lt;= 0) { throw new ArgumentException("capacity should always be bigger than 0"); } data = new Dictionary&lt;TKey, TValue&gt;(capacity); dataAsCollection = data; this.capacity = capacity; } public void Add(TKey key, TValue value) { if (!ContainsKey(key)) { this[key] = value; } else { throw new ArgumentException("An attempt was made to insert a duplicate key in the cache."); } } public bool ContainsKey(TKey key) { return data.ContainsKey(key); } public ICollection&lt;TKey&gt; Keys { get { return data.Keys; } } public bool Remove(TKey key) { bool existed = data.Remove(key); lruList.Remove(key); return existed; } public bool TryGetValue(TKey key, out TValue value) { return data.TryGetValue(key, out value); } public ICollection&lt;TValue&gt; Values { get { return data.Values; } } public TValue this[TKey key] { get { var value = data[key]; lruList.Remove(key); lruList.Add(key); return value; } set { data[key] = value; lruList.Remove(key); lruList.Add(key); if (data.Count &gt; capacity) { data.Remove(lruList.First); lruList.RemoveFirst(); } } } public void Add(KeyValuePair&lt;TKey, TValue&gt; item) { Add(item.Key, item.Value); } public void Clear() { data.Clear(); lruList.Clear(); } public bool Contains(KeyValuePair&lt;TKey, TValue&gt; item) { return dataAsCollection.Contains(item); } public void CopyTo(KeyValuePair&lt;TKey, TValue&gt;[] array, int arrayIndex) { dataAsCollection.CopyTo(array, arrayIndex); } public int Count { get { return data.Count; } } public bool IsReadOnly { get { return false; } } public bool Remove(KeyValuePair&lt;TKey, TValue&gt; item) { bool removed = dataAsCollection.Remove(item); if (removed) { lruList.Remove(item.Key); } return removed; } public IEnumerator&lt;KeyValuePair&lt;TKey, TValue&gt;&gt; GetEnumerator() { return dataAsCollection.GetEnumerator(); } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return ((System.Collections.IEnumerable)data).GetEnumerator(); } } } </code></pre>
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    2. COI fixed the link, but I recall there is a bug in the code, I will try to fix it.
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    3. COI updated the code, and wrote a few tests which did not find any flaws, not to say it has no bugs
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