Koki-Shimizu · May 28, 2015 19:59 · May 28, 2015
diff --git a/gistfile1.cs b/gistfile1.cs
@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace fciv
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var files = Directory.GetFiles(@"C:\oracle\", "*.sql", SearchOption.AllDirectories).OrderBy(_ => _).ToList();
+            var outputXmlName = "result.xml";
+            File.Delete(outputXmlName);
+
+            var sw = new Stopwatch();
+            sw.Start();
+
+            using( var outputXml = File.AppendText(outputXmlName) )
+            {             
+                foreach (var file in files)
+                {
+                    var s = CheckSum(file, 4096);
+                    outputXml.WriteLine(s);               
+                }
+                outputXml.Flush();
+            }
+
+            sw.Stop();
+            var ts = sw.Elapsed;
+            Debug.WriteLine(ts); // 出力例：00:00:00.9984668
+
+        }
+
+        private static string CheckSum(string file, int bufferSize)
+        {
+            try
+            { 
+                using (var sm = new BufferedStream(File.OpenRead(file), bufferSize))
+                {
+                    using( var sha = MD5.Create() )
+                    { 
+                        var checksum = sha.ComputeHash(sm);
+                        return BitConverter.ToString(checksum).Replace("-", String.Empty).ToLower();
+                    }
+                }
+            }
+            catch 
+            {
+                // ファイルアクセス拒否時等…
+                return string.Empty;
+            }
+        }
+    }
+}
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