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POValue types and Dictionary retrieval
 

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    <p>The class below raises an event for every new “dataKey” registered and raises an event when a “dataKey” is deregistered and count for that “dataKey is zero.</p> <p>This class aims to be threadsafe and I am trying to make this as performant as possible.</p> <p>My question is; in the Deregister method can I somehow remove the 2nd lookup when I update the value (the _data[dataKey] = currentCountValue;)?</p> <p>I can’t simple update the currentCountValue variable as the value is updated on the local stack only and not in the Dictionary.</p> <p>Or can you sugguested any performance improvements? I don’t think I can remove the lock and use CAS operations (Interlocked methods) to update the count as the dictionary is not threadsafe for updates when used like this … right?</p> <p>/I am using c# 3.0.</p> <p>Thanks for your time.</p> <pre><code>public sealed class DataCounter { public event EventHandler NewKeyEvent; public event EventHandler ZeroCountEvent; private readonly Dictionary&lt;string, int&gt; _data = new Dictionary&lt;string, int&gt;(); public void Register(string dataKey) { lock (_data) { if (_data.ContainsKey(dataKey)) { _data[dataKey]++; } else { _data.Add(dataKey, 1); if (NewKeyEvent != null) NewKeyEvent(this, null); } } } public void Deregister(string dataKey) { lock (_data) { int currentCountValue; if (_data.TryGetValue(dataKey, out currentCountValue)) { if (currentCountValue &gt; 0) { currentCountValue--; _data[dataKey] = currentCountValue; } if (currentCountValue == 0) { if (ZeroCountEvent != null) ZeroCountEvent(this, null); } } } } } </code></pre>
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