初始化版本

tongxin/NetWorkHelper/Helper/MD5Helper.cs

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+using System;
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace NetWorkHelper
+{
+    public static class MD5Helper
+    {
+        public static string CretaeMD5(string fileName)
+        {
+            string hashStr = string.Empty;
+            try
+            {
+                FileStream fs = new FileStream(
+                    fileName,
+                    FileMode.Open,
+                    FileAccess.Read,
+                    FileShare.Read);
+                MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
+                byte[] hash = md5.ComputeHash(fs);
+                hashStr = ByteArrayToHexString(hash);
+                fs.Close();
+                fs.Dispose();
+            }
+            catch (Exception ex)
+            {
+                throw ex;
+            }
+            return hashStr;
+        }
+
+        public static string CretaeMD5(Stream stream)
+        {
+            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
+            byte[] hash = md5.ComputeHash(stream);
+            return ByteArrayToHexString(hash);
+        }
+
+        public static string CretaeMD5(byte[] buffer, int offset, int count)
+        {
+            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
+            byte[] hash = md5.ComputeHash(buffer, offset, count);
+            return ByteArrayToHexString(hash);
+        }
+
+        private static string ByteArrayToHexString(byte[] values)
+        {
+            StringBuilder sb = new StringBuilder();
+            foreach (byte value in values)
+            {
+                sb.AppendFormat("{0:X2}", value);
+            }
+            return sb.ToString();
+        }
+    }
+}