XML的一些操作

XML文件：

<?xml version="1.0" encoding="utf-8" ?>
<All>
    <Config>
        <appConfig>This is Connectiong String</appConfig>
    </Config>
    <Message>
        <Name>This is Name</Name>
    </Message>
    <KY>
        <key>1</key>
        <value>这是key1</value>
    </KY>
    <KY>
        <key>2</key>
        <value>这是key2</value>
    </KY>
    <KY>
        <key>3</key>
        <value>这是key3</value>
    </KY>
</All>

C#代码：

public partial class HandleXml : System.Web.UI.Page
    {
        //读取此项目所在路径
        string Path = AppDomain.CurrentDomain.BaseDirectory + @"\XML\XMLConfig.xml";
        protected void Page_Load(object sender, EventArgs e)
        {
            
        }
        #region  读取单个节点的内容
        private string DocXml()
        {
            XmlDocument Xml = new XmlDocument();            
            Xml.Load(Path);
            XmlNode xn = Xml.SelectSingleNode("//All/Config/appConfig");
            return xn.InnerText;           
            //return xn.InnerXml; 包括节点一起返回
        }
        #endregion

        #region  从根节点开始读取全部XML内容
        private string DocAllXml()
        {
            XmlDocument Xml = new XmlDocument();
            Xml.Load(Path);            
            XmlNode xn = Xml.DocumentElement;
            return xn.OuterXml;
        }
        #endregion

        #region 同名情况下，通过key读value
        private string ThrowKey()
        {
            XmlDocument Xml = new XmlDocument();
            Xml.Load(Path);
            XmlNode xn = Xml.SelectSingleNode("//All/KY[key=2]/value");
            return xn.InnerText;
        }
        #endregion
        protected void Button1_Click(object sender, EventArgs e)
        {
            Label1.Text = ThrowKey();
        }
        
    }