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    <p>I use the following extension methods to make cached versions of delegates:</p> <pre><code> public static Func&lt;T, TResult&gt; AsCached&lt;T, TResult&gt;(this Func&lt;T, TResult&gt; function) { var cachedResults = new Dictionary&lt;T, TResult&gt;(); return (argument) =&gt; { TResult result; lock (cachedResults) { if (!cachedResults.TryGetValue(argument, out result)) { result = function(argument); cachedResults.Add(argument, result); } } return result; }; } public static Func&lt;T1, T2, TResult&gt; AsCached&lt;T1, T2, TResult&gt;(this Func&lt;T1, T2, TResult&gt; function) { var cachedResults = new Dictionary&lt;Tuple&lt;T1, T2&gt;, TResult&gt;(); return (value1, value2) =&gt; { TResult result; var paramsTuple = new Tuple&lt;T1, T2&gt;(value1, value2); lock(cachedResults) { if (!cachedResults.TryGetValue(paramsTuple, out result)) { result = function(value1, value2); cachedResults.Add(paramsTuple, result); } } return result; }; } public static Func&lt;T1, T2, T3, TResult&gt; AsCached&lt;T1, T2, T3, TResult&gt;(this Func&lt;T1, T2, T3, TResult&gt; function) { var cachedResults = new Dictionary&lt;Tuple&lt;T1, T2, T3&gt;, TResult&gt;(); return (value1, value2, value3) =&gt; { TResult result; var paramsTuple = new Tuple&lt;T1, T2, T3&gt;(value1, value2, value3); lock(cachedResults) { if (!cachedResults.TryGetValue(paramsTuple, out result)) { result = function(value1, value2, value3); cachedResults.Add(paramsTuple, result); } } return result; }; } </code></pre> <p>And so on for N parameters...</p> <p>In case it's not clear from the code, I create a tuple with the arguments, and use the tuple as a key to a dictionary that holds the return values for each set of arguments. Note that every time you call <code>AsCached</code>, you create a separate cache.</p> <p>You can use these methods as follows:</p> <pre><code>private Func&lt;int, SomeEntity&gt; _getCached; public SomeEntity Get(int id) { if (_getCached == null) { Func&lt;int, SomeEntity&gt; func = GetImpl; _getCached = func.AsCached(); } return _getCached(id); } private SomeEntity GetImpl(int id) { return base.GetItem&lt;SomeEntity&gt; ("select * from SomeEntities where id = @idParam", new { idParam = id}); } </code></pre>
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    1. USThomas Levesque
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