jlewin · June 27, 2013 18:23 · Jun 27, 2013
diff --git a/ListDuplicateFiles.cs b/ListDuplicateFiles.cs
@@ -0,0 +1,20 @@
+/// <summary>
+/// Processes a given directory, grouping and listing files with duplicate content
+/// </summary>
+/// <param name="directory">The path to process</param>
+private void ListDuplicateFiles(string directory)
+{
+    // Calculate and store the hash and path for each file in the directory
+    var files = Directory.GetFiles(directory).Select(f => new { Path = f, Hash = FileHash.CalculateFromFile(f) });
+
+    // Group and iterate when duplicates exist
+    foreach (var group in files.GroupBy(f => f.Hash).Where(g => g.Count() > 1))
+    {
+        Console.WriteLine("--- Dupe ({0})-------------------------------", group.Key);
+        foreach (var file in group)
+        {
+            // List each file
+            Console.WriteLine("\t  {0}", Path.GetFileName(file.Path));
+        }
+    }
+}
diff --git a/Supporting-FileHash.cs b/Supporting-FileHash.cs
@@ -0,0 +1,21 @@
+public static class FileHash
+{
+    /// <summary>
+    /// Generate an MD5 hash of the given file
+    /// </summary>
+    /// <param name="filename">The content file</param>
+    /// <returns>The generated hash</returns>
+    public static string CalculateFromFile(string filename)
+    {
+        // read file bytes
+        byte[] bytes = File.ReadAllBytes(filename);
+
+        // md5 calculation
+        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
+        byte[] output = md5.ComputeHash(bytes);
+        string hash = Convert.ToBase64String(output);
+
+        // returning
+        return hash;
+    }
+}