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    <p>Here's how:</p> <pre><code>String s = String.Join(", ", (from extension in extensions select extension.ToUpper()).ToArray()); </code></pre> <p>Note, I would probably not write this as <em>one line</em>, rather like this:</p> <pre><code>String s = String.Join(", ", (from extension in extensions select extension.ToUpper()).ToArray()); </code></pre> <p>If you don't mind just going for the Linq extension methods directly, instead of the Linq query syntax, you can use this:</p> <pre><code>String s = String.Join(", ", extensions.Select(e =&gt; e.ToUpper()).ToArray()); </code></pre> <p>Another variant would be to just call <code>ToUpper</code> on the final string instead:</p> <pre><code>String s = String.Join(", ", extensions.ToArray()).ToUpper(); </code></pre> <p>And finally, in .NET 4.0, <code>String.Join</code> finally supports <code>IEnumerable&lt;String&gt;</code> directly, so this is possible:</p> <pre><code>String s = String.Join(", ", extensions).ToUpper(); </code></pre> <p>Note that per your question, this might lead to duplicates nonetheless. Consider what would happen if your original list of filenames contained both <code>"filename.txt"</code> and <code>"filename.TXT"</code>, these would be counted as two distinct extensions.</p> <p>The call to <code>ToUpper</code> should be moved up before the call to <code>Distinct</code> to fix this.</p> <p>Instead of the original Linq expression + code, I would rewrite the whole thing to this:</p> <pre><code>String[] distinctExtensions = files .Select(fileName =&gt; Path.GetExtension(fileName).ToUpper()) .Distinct() .ToArray(); String distinctExtensionsAsString = String.Join(", ", distinctExtensions); </code></pre> <p>If you add the following utility method to your code library, you can simplify it further:</p> <pre><code>public static class StringExtensions { public static String Join(this IEnumerable&lt;String&gt; elements, String separator) { if (elements is String[]) return String.Join(separator, (String[])elements); else return String.Join(separator, elements.ToArray()); } } </code></pre> <p>and then your code can look like this:</p> <pre><code>String distinctExtensionsAsString = files .Select(fileName =&gt; Path.GetExtension(fileName).ToUpper()) .Distinct() .Join(", "); </code></pre>
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    1. USLasse Vågsæther Karlsen
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