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POC# Intersecting Partial Matches
 

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    <p>Good Afternoon all, I'm trying to run a comparison of the contents of 2 folders and I have it working after-a-fashion but I'm curious whether there's a better way. Here's what I have:</p> <pre><code> static void Main(string[] args) { reportDiffs("C:\\similar\\a", "C:\\similar\\b"); Console.WriteLine("--\nPress any key to quit"); Console.ReadKey(); } public static void reportDiffs(string sourcePath1, string sourcePath2) { string[] paths1 = Directory.GetFiles(sourcePath1); string[] paths2 = Directory.GetFiles(sourcePath2); string[] fileNames1 = getFileNames(paths1, sourcePath1); string[] fileNames2 = getFileNames(paths2, sourcePath2); IEnumerable&lt;string&gt; notIn2 = fileNames1.Except(fileNames2); IEnumerable&lt;string&gt; notIn1 = fileNames2.Except(fileNames1); IEnumerable&lt;string&gt; inBoth = fileNames1.Intersect(fileNames2); printOut("Files not in folder1: ", sourcePath2, notIn1); printOut("Files not in folder2: ", sourcePath1, notIn2); printOut("Files found in both: ", "", inBoth); } private static string[] getFileNames(string[] currentFiles, string currentPath) { string[] currentNames = new string[currentFiles.Length]; int i; for (i = 0; i &lt; currentNames.Length; i++) { currentNames[i] = currentFiles[i].Substring(currentPath.Length); } return currentNames; } private static void printOut(string headline, string currentPath, IEnumerable&lt;string&gt; fileNames) { Console.WriteLine(headline); foreach (var n in fileNames) { Console.WriteLine(currentPath + n); } Console.WriteLine("--"); } </code></pre> <p>It feels like I'm missing a trick and that there's an existing array method, like Intersect, that I could have passed paths1 &amp; paths2 to rather than doing the fileNames1 &amp; 2 step but, for the life of me, I couldn't find anything like it in the framework.</p> <p>Cheers, Sam</p>
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    1. COHave you looked at the HashSet collection?
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