今天瞎寫的關於XML的一些。

using System;
using System.Windows.Forms;
using System.Xml;

namespace winformDemo
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        //XmlDocument打開文檔
        XmlDocument xc = new XmlDocument();
        /// <summary>
        /// 顯示所有商品的名字
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            // xc.Load（寫入要獲取文檔的路徑）
            xc.Load("D:\\Text\\shopping.xml");
            //XmlNodeList xnl = xc.SelectSingleNode("shopping").ChildNodes;獲取shopping下麵的子節點放到集合里。
            XmlNodeList xnl = xc.SelectSingleNode("shopping").ChildNodes;
            //迴圈去取子節點
            foreach (XmlNode xn in xnl)
            {
                //獲取商品名字。
                //this.textBox1.Text += xn.Attributes["id"].Value + "\r\n";
                foreach (XmlNode xnd in xn.ChildNodes)
                {
                    if (xnd.Name == "Shopname")
                    {
                        textBox1.Text += "商品名字：" + xnd.InnerText + "\r\n";
                    }
                }
            }
        }
        /// <summary>
        /// 顯示所有商品信息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            this.textBox2.Text = "";
            // xc.Load（寫入要獲取文檔的路徑）
            xc.Load("D:\\Text\\shopping.xml");
            //XmlNodeList xnl = xc.SelectSingleNode("shopping").ChildNodes;獲取shopping下麵的子節點放到集合里。
            XmlNodeList xnl = xc.SelectSingleNode("shopping").ChildNodes;
            //XmlNodeList xnl = xc.SelectSingleNode("/shopping/shop[last()]").ChildNodes;
            //XmlNodeList xnl = xc.SelectSingleNode("/shopping/shop[@id=2]").ChildNodes;
            //迴圈去取子節點
            foreach (XmlNode xn in xnl)
            {
                //取最後一條數據

                //textBox2.Text += "商品名字：" + xn.InnerText + "\r\n";
                //獲取所有商品的信息。
                textBox2.Text += "商品ID：" + xn.Attributes["id"].Value + "\r\n";
                textBox2.Text += "商品名字：" + xn.ChildNodes[0].InnerText + "\r\n";
                textBox2.Text += "商品價格：" + xn.ChildNodes[1].InnerText + "\r\n";
                textBox2.Text += "商品數量：" + xn.ChildNodes[2].InnerText + "\r\n";
            }
        }
        /// <summary>
        /// 讀取所有信息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            this.textBox3.Text = "";
            XmlReader reader = XmlReader.Create(@"D:\\Text\\shopping.xml");
            while (reader.Read())
            {
                switch (reader.NodeType)
                {
                    case XmlNodeType.Attribute:
                        for (int i = 0; i < reader.AttributeCount; i++)
                        {
                            reader.MoveToAttribute(i);
                            this.textBox3.Text += "屬性：" + reader.Name + "=" + reader.Value + "\r\n";
                        }
                        break;
                    case XmlNodeType.Element:
                        this.textBox3.Text += "節點名稱：" + reader.LocalName + "\r\n";
                        for (int i = 0; i < reader.AttributeCount; i++)
                        {
                            reader.MoveToAttribute(i);
                            this.textBox3.Text += "屬性：" + reader.Name + "=" + reader.Value + "\r\n";
                        }
                        break;
                    case XmlNodeType.Text:
                        this.textBox3.Text += "節點內容：" + reader.Value + "\r\n";
                        break;
                }
            }
        }
        /// <summary>
        /// 添加信息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_Click(object sender, EventArgs e)
        {
            XmlWriter writer = XmlWriter.Create(@"D:\\Text\\goods.xml");
            writer.WriteStartElement("dog");
            writer.WriteAttributeString("color", "black");
            writer.WriteString("How can I be sure");
            writer.WriteEndDocument();
            writer.Close();
        }
    }
}

添加XML 是直接添加進去了，沒有顯示出來。所以不要重覆點擊，可以去文本里看。

總結的一些：
                        XML
xml：
    （超級標記語言）又稱（可擴展標記語言）（簡單的數據存儲語言）（數據存儲技術）
格式：
    gb2312，UTF-8；
資料庫的存儲是XML格式。
特點：
    跨平臺、跨語言、跨系統、跨瀏覽器、節點名自定義、封閉、區分大小寫、屬性自定義、唯一根節點。
C#提供XML的對象和方法：
    XMLDocument(xml文檔)：(load（路徑）、SelectSingleNode（獲取根節點）、childNodes（子節點）)
    XMLNodelist(節點集合)：(XmlNodeList list=根節點下節點)
    XMLNode(節點)：(屬性：text、innerText、name、attributrs[]、value、childNodes)