计算文件MD5值

GetMD5HashFromFile.cs

private static string GetMD5HashFromFile(string fileName)
 {
     try
     {
         FileStream file = new FileStream(fileName, FileMode.Open);
         System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
         byte[] retVal = md5.ComputeHash(file);
         file.Close();

        StringBuilder sb = new StringBuilder();
         for (int i = 0; i < retVal.Length; i++)
         {
         sb.Append(retVal[i].ToString(“x2″));
         }
         return sb.ToString();
     }
     catch (Exception ex)
     {
     throw new Exception(“GetMD5HashFromFile() fail,error:” + ex.Message);
     }
 }