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copied!<p>Why don't use just something like this (without recursion) ?</p> <pre><code>public static IEnumerable<string> GetMachingFiles(string pathA, string pathB) { var matchingFiles = new HashSet<string>(); var allAfiles = Directory.GetFiles(pathA, "*", SearchOption.AllDirectories); foreach (var file in allAfiles) { foreach (var mathcFile in Directory.GetFiles(pathB, Path.GetFileName(file), SearchOption.AllDirectories)) matchingFiles.Add(mathcFile); } return matchingFiles; } </code></pre> <p>Of course this solution suffers a performance decay in case of many files, because <code>Directory.GetFiles</code> navigates all files even when you pass a restrictive pattern. To be more faster you could use LINQ as pointed out in <a href="https://stackoverflow.com/questions/4374887/how-to-compare-two-folders-for-similar-files-based-on-name-in-c/4375203#4375203">Brian Rasmussen's answer</a></p> <p><strong>EDIT:</strong><br> a faster example using LINQ (.NET 3.5):</p> <pre><code>public static IEnumerable<string> GetMachingFilesFast(string pathA, string pathB) { DirectoryInfo dirA = new DirectoryInfo(pathA); DirectoryInfo dirB = new DirectoryInfo(pathB); var filesA = dirA.GetFiles("*",SearchOption.AllDirectories); var filesB = dirB.GetFiles("*", SearchOption.AllDirectories); var matchingFiles = filesA.Where(fA => filesB.Any( fB => fA.Name == fB.Name // && fA.LastWriteTime == fB.LastWriteTime ) ) .Select(x => x.Name); return matchingFiles; } </code></pre>

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