public class Cat
{
    public string Color { get; set; }
    public int Speed { get; set; }
    public string Name{ get; set; }
 }
//序列化
var cat1=new Cat{Color="Write",Speed=50,Name="MiMi" };
XmlSerializer ser = new XmlSerializer(typeof(Cat));
MemoryStream ms = new MemoryStream();
ser.Serialize(ms, cat1);
string xmlString = Encoding.UTF8.GetString(ms.ToArray());
//xmlString就是你要保存到数据库的字符串
 
//反序列化
XmlSerializer dser = new XmlSerializer(typeof(Cat));
//xmlString是你从数据库获取的字符串
Stream xmlStream = new MemoryStream(Encoding.UTF8.GetBytes(xmlString));
Cat cat2=dser.Deserialize(xmlStream) as Cat;//cat2 就是你要得到的class对象

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.IO;
using System.Collections;
using System.Runtime.Serialization.Formatters.Binary;
  
//数据库说明：MyTest数据库，RWTest表,包含3列：ID(int),Description(varchar(50), Data(varbinary(max))
  
namespace RWArrayListSQL
{
    public partial class Form1 : Form
    {
        ArrayList arrayList = new ArrayList();
        public Form1()
        {
            InitializeComponent();
            for (int i = 0; i < 100; i++)
            {
                PTData ptData = new PTData();
                ptData.PTID = i + 1;
                ptData.PTName = Convert.ToString(i + 1);
                ptData.PT_Data = i + 1;
                arrayList.Add(ptData);
            } 
        }
  
        private void buttonFileToDB_Click(object sender, EventArgs e)
        {
                SqlConnection sqlConnection = new SqlConnection("Data Source=liuxueqin;Initial Catalog=MyTest;Integrated Security=True");                
                SqlDataAdapter sqlDataAdapter = new SqlDataAdapter("Select * from RWTest", sqlConnection);
                SqlCommandBuilder sqlCommandBuilder = new SqlCommandBuilder(sqlDataAdapter);
                System.Data.DataSet dataSet = new DataSet("RWTest");
                sqlDataAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;//确定现有 DataSet 架构与传入数据不匹配时需要执行的操作。
                //定义一个流
                Stream stream = new MemoryStream();
                //定义一个格式化器
                BinaryFormatter bf = new BinaryFormatter();
                foreach (object obj in arrayList)
                {
                    bf.Serialize(stream, obj);  //序列化
                }
                byte[] array = null;
                array = new byte[stream.Length];
                //将二进制流写入数组
                stream.Position = 0;
                stream.Read(array, 0, (int)stream.Length);
                //关闭流
                stream.Close();
  
            try
            {
                sqlDataAdapter.Fill(dataSet, "RWTest");
                //DataRow表示DataTable中的一行数据
                System.Data.DataRow dataRow1;
                dataRow1 = dataSet.Tables["RWTest"].NewRow();
                dataRow1["ID"] = 1;
                dataRow1["Description"] = "This would be description text";                
                dataRow1["Data"] = array;
  
                dataSet.Tables["RWTest"].Rows.Add(dataRow1);
                sqlDataAdapter.Update(dataSet, "RWTest");
                sqlConnection.Close();
                MessageBox.Show("写入数据库成功！", " 信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                if (sqlConnection.State == ConnectionState.Open)
                {
                    sqlConnection.Close();
                }
                MessageBox.Show("写入数据库失败"+ex.Message, " 信息提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
  
        private void buttonDBToFile_Click(object sender, EventArgs e)
        {
            SqlConnection sqlConnection = new SqlConnection("Data Source=liuxueqin;Initial Catalog=MyTest;Integrated Security=True");
            SqlDataAdapter sqlDataAdapter = new SqlDataAdapter("Select * from RWTest", sqlConnection);
            SqlCommandBuilder sqlCommandBuilder = new SqlCommandBuilder(sqlDataAdapter);
            DataSet dataSet = new DataSet("RWTest");
            
            sqlDataAdapter.Fill(dataSet, "RWTest");
            DataRow myRow;
            myRow = dataSet.Tables["RWTest"].Rows[0]; 
  
            byte[] b = null;
            b = (byte[])myRow["Data"];
            //定义一个流
            MemoryStream stream = new MemoryStream(b);
            //定义一个格式化器
            BinaryFormatter bf = new BinaryFormatter();            
            while (stream.Position != stream.Length)
            {
                arrayList.Add(bf.Deserialize(stream));  //反序列化
            }
            stream.Close();
 
            for(int i=0;i<5;i++) //信息提示，是否正确从数据库中取出了ArrayList链表
            MessageBox.Show(((PTData)arrayList[i]).PTName, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information); 
  
            if (sqlConnection.State == ConnectionState.Open)
            {
                sqlConnection.Close();
            }
            MessageBox.Show(" 从数据库读出数据成功！", " 信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
        } 
}
  
    //在类的上面增加了属性:Serializable.(如果不加这个属性,将抛出SerializationException异常)。在不继承自接口ISerializable的情况下，通过增加[Serializable]属性可以允许该类可以被序列化。
    [Serializable] 
    class PTData
    {
        public PTData()
        {
            PTID = 1;
            PTName = "None";
            PT_Data = 1.0;
        }
        public int PTID;
        public string PTName;
        public double PT_Data;
    }
}