得到檔案校驗值

public static string GetMD5HashFromFile(string fileName)
{
      try
      {
           FileStream file = new FileStream(fileName, System.IO.FileMode.Open, FileAccess.Read);
           MD5 md5 = new 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)
       {
           MyLog(LogPath , "Message " + System.DateTime.Now.ToLongTimeString() +" :"
 
+ ex.Message);//MessageLog
           return "no access";
           //throw new Exception("GetMD5HashFromFile() fail,error:" + ex.Message);
       }
}

得到String校驗值

public static string GetMD5HashFromFile(string strToHash)
{
    try
    {
        MD5 md5 = new MD5CryptoServiceProvider();
        byte[] bytes = System.Text
 
.Encoding.UTF8.GetBytes(strToHash);
        bytes = md5.ComputeHash(bytes);
        md5.Clear();

        String ret = "";
        for (int i = 0; i < bytes.Length; i++)
        {
            ret += Convert.ToString(bytes[i], 16).PadLeft(2, '0');
        }
        return ret;
    }
    catch (Exception ex)
    {
        Console.WriteLine("Message " + System.DateTime.Now.ToLongTimeString() + " :" + ex.Message);//MessageLog
        return "Md5 Error";
    }
}