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    <p><code>const</code> is for compile-time constants. You <em>could</em> just make it <code>static readonly</code>, but that would only apply to the <code>METRICS</code> variable itself (which should typically be Metrics instead, by <a href="http://msdn.microsoft.com/en-us/library/ms229043.aspx" rel="noreferrer">.NET naming conventions</a>). It wouldn't make the <em>list</em> immutable - so someone could call <code>METRICS.Add("shouldn't be here");</code></p> <p>You may want to use a <code>ReadOnlyCollection&lt;T&gt;</code> to wrap it. For example:</p> <pre><code>public static readonly IList&lt;String&gt; Metrics = new ReadOnlyCollection&lt;string&gt; (new List&lt;String&gt; { SourceFile.LoC, SourceFile.McCabe, SourceFile.NoM, SourceFile.NoA, SourceFile.FanOut, SourceFile.FanIn, SourceFile.Par, SourceFile.Ndc, SourceFile.Calls }); </code></pre> <p><code>ReadOnlyCollection&lt;T&gt;</code> just wraps a potentially-mutable collection, but as nothing else will have access to the <code>List&lt;T&gt;</code> afterwards, you can regard the overall collection as immutable.</p> <p>(The capitalization here is mostly guesswork - using fuller names would make them clearer, IMO.)</p> <p>Whether you declare it as <code>IList&lt;string&gt;</code>, <code>IEnumerable&lt;string&gt;</code>, <code>ReadOnlyCollection&lt;string&gt;</code> or something else is up to you... if you expect that it should only be treated as a sequence, then <code>IEnumerable&lt;string&gt;</code> would probably be most appropriate. If the order matters and you want people to be able to access it by index, <code>IList&lt;T&gt;</code> may be appropriate. If you want to make the immutability apparent, declaring it as <code>ReadOnlyCollection&lt;T&gt;</code> could be handy - but inflexible.</p>
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    1. USJon Skeet
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    1. COlove to read your answers.
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    2. COi came here looking for the `new List<string>{ ... }` part. Thanks Jon :)
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