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Achieve Persistence Through Serialization

, 6 Jan 2011
This article compares the two common types of serialization in aspects of data access, readability, and runtime cost.
/// this code is provided as is, bugs are probable, free for any use, no responsibility accepted :-)
/// Please contact trestan88@yahoo.ca,for any questions and suggestions.
/// 
using System;
using System.Xml.Serialization;
using System.IO;
using System.ComponentModel;
using System.Security.Cryptography;
using System.Runtime.Serialization.Formatters.Binary;

namespace Trestan
{
    public static class Utility
    {
        public static string ObjectToString(object theObject)
        {
            TypeConverter tc = TypeDescriptor.GetConverter(theObject.GetType());
            return tc.ConvertToString(theObject);
        }

        public static object ObjectFromString(Type theType, string strInstance)
        {
            TypeConverter tc = TypeDescriptor.GetConverter(theType);
            return tc.ConvertFromString(strInstance);
        }

        public static void SerializeWithEncrypt(object theObject, string sFileName)
        {
            long tick = DateTime.Now.Ticks;
            MemoryStream theMS = new MemoryStream();
            BinaryFormatter btFormatter = new BinaryFormatter();
            btFormatter.Serialize(theMS, theObject);
            theMS.Seek(0, SeekOrigin.Begin);
            byte[] temp = theMS.ToArray();
            Console.WriteLine("Time used to serialize to memory stream: " + (DateTime.Now.Ticks - tick) / 10000000F);
            tick = DateTime.Now.Ticks;

            // SampleEncryption(temp);  // The simple method is much faster.
            temp = Encrypt(temp);
            Console.WriteLine("Time used to encrypt: " + (DateTime.Now.Ticks - tick) / 10000000F);
            tick = DateTime.Now.Ticks;
            //Output to a file.
            FileStream theFileStream = new FileStream(sFileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite);
            BinaryWriter theBW = new BinaryWriter(theFileStream);

            theBW.Write(temp, 0, temp.Length);
            theBW.Close();
            theFileStream.Close();
            theMS.Dispose();
            Console.WriteLine("Time used to write to file: " + (DateTime.Now.Ticks - tick) / 10000000F);
            Console.WriteLine("End of a test\n");
        }

        public static object DeSerializeWithDecrypt(string sFileName)
        {
            if (sFileName == null || sFileName == "" || !File.Exists(sFileName))
            {
                return null;
            }
            byte[] temp = File.ReadAllBytes(sFileName);

            // SampleEncryption(temp);
            temp = Decrypt(temp);

            MemoryStream theMS = new MemoryStream(temp);
            BinaryFormatter btFormatter = new BinaryFormatter();
            object theObj = btFormatter.Deserialize(theMS);
            theMS.Dispose();
            return theObj;
        }

        public static void SampleEncryption(byte[] theData)
        {
            // You can run an encrytion algorithm here.
            // Google "C# byte encrypt", to find ready-to-use code.
            #region a simply encryption
            System.Collections.BitArray theBits = new System.Collections.BitArray(theData);
            theBits.Not();
            byte[] bt = System.Text.Encoding.Default.GetBytes("this is a test.add up to the same length");
            byte[] theKey = new byte[theData.Length];

            int count = 0;
            int limit = theData.Length - bt.Length;
            while (count < limit)
            {
                bt.CopyTo(theKey, count);
                count += bt.Length;
            }

            System.Collections.BitArray key = new System.Collections.BitArray(theKey);
            theBits.Xor(key);
            theBits.CopyTo(theData, 0);
            #endregion a simply encryption
        }

        public static byte[] Encrypt(byte[] theData)
        {
            byte[] byKey = { 0x6A, 0x87, 0x98, 0x59, 0x38, 0xB7, 0x5F, 0xF1 };
            byte[] IV = { 0xBE, 0xD5, 0xA6, 0x4B, 0x95, 0xC6, 0xCC, 0x4B };

            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
            ICryptoTransform desencrypt = DES.CreateEncryptor(byKey, IV);
            byte[] result = desencrypt.TransformFinalBlock(theData, 0, theData.Length);
            return result;
        }

        public static byte[] Decrypt(byte[] theData)
        {
            byte[] byKey = { 0x6A, 0x87, 0x98, 0x59, 0x38, 0xB7, 0x5F, 0xF1 };
            byte[] IV = { 0xBE, 0xD5, 0xA6, 0x4B, 0x95, 0xC6, 0xCC, 0x4B };
            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();

            ICryptoTransform desencrypt = DES.CreateDecryptor(byKey, IV);
            byte[] result = desencrypt.TransformFinalBlock(theData, 0, theData.Length);
            return result;
        }
    }
}

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About the Author

trestan
Team Leader
Canada Canada
Looking for something to do in the new year.

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