C# 图片文件保存到XML中

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.IO;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 选择一个图片文件，然后写进XML中（提前准备好一个空的XML文件pic.xml放在应用程序目录中）
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            DialogResult oK = openFileDialog1.ShowDialog() ;
            if (oK == DialogResult.OK)
            {
                try
                {
                    XmlDocument myXmlDoc = new XmlDocument();

                    myXmlDoc.Load( Application.StartupPath + "\\pic.xml");

                    XmlElement elem = myXmlDoc.CreateElement("image");

                    // 打开图片文件，利用该图片构造一个文件流
                    FileStream fs = new FileStream(openFileDialog1.FileName, FileMode.Open);
                    // 使用文件流构造一个二进制读取器将基元数据读作二进制值
                    BinaryReader br = new BinaryReader(fs);

                    byte[] imageBuffer = new byte[br.BaseStream.Length];

                    br.Read(imageBuffer, 0, Convert.ToInt32(br.BaseStream.Length));

                    string textString = System.Convert.ToBase64String(imageBuffer);

                    fs.Close();
                    br.Close();

                    XmlText text = myXmlDoc.CreateTextNode(textString);

                    myXmlDoc.DocumentElement.AppendChild(elem);
                    myXmlDoc.DocumentElement.LastChild.AppendChild(text);

                    myXmlDoc.Save(Application.StartupPath + "\\docSave.xml");

                    MessageBox.Show("读写结束！");
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
        }

        /// <summary>
        /// 选择一个XML文件，读取后保存成文件。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            DialogResult oK = saveFileDialog1.ShowDialog();
            if (oK == DialogResult.OK)
            {
                try
                {
                    int readByte = 0;
                    int bytesToRead = 1044;
                    XmlTextReader xmlTxtRd = new XmlTextReader(Application.StartupPath + "\\docSave.xml");
                    FileStream fs = new FileStream(saveFileDialog1.FileName, FileMode.Create);
                    BinaryWriter bw = new BinaryWriter(fs);

                    byte[] base64buffer = new byte[bytesToRead];
                    while (xmlTxtRd.Read())
                    {
                        if (xmlTxtRd.NodeType == XmlNodeType.Element && xmlTxtRd.Name == "image")
                        {
                            do
                            {
                                readByte = xmlTxtRd.ReadBase64(base64buffer, 0, bytesToRead);
                                bw.Write(base64buffer, 0, readByte);
                            }
                            while (bytesToRead <= readByte);
                        }
                    }

                    bw.Flush();
                    bw.Close();
                    fs.Close();

                    xmlTxtRd.Close();
                    MessageBox.Show("读写结束！");
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
        }
        
    }
}