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通过DataSet 来读写XML的相关代码，整理了一下。

内容比较简单，也最基础。 mark一下，以后查阅用。

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.IO;
using System.Xml;
using System.Xml.XPath;

namespace WindowsApplication2
{
    class XmlReader
    {
        private string _filePath = @"C:\Test.xml";

        // 读取XML
        public void ReadXmlFile()
        {
            if (File.Exists(_filePath))
            {
                DataSet ds = new DataSet();
                ds.ReadXml(_filePath);
                if (ds.Tables["MyTable"] != null)
                {
                    DataTable dt = ds.Tables["MyTable"];
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        string str1 = dt.Rows[i]["Data1"].ToString(); //取得结点1的值
                        string str2 = dt.Rows[i]["Data2"].ToString(); //取得结点2的值
                    }
                }
            }
        }

        // 写入XML
        public void WriteXmlFile()
        {
            XmlTextWriter wr = null;
            try
            {
                DataSet ds = new DataSet("MyData");
                DataTable tb = new DataTable("MyTable");
                tb.Columns.Add("Data1", typeof(int));
                tb.Columns.Add("Data2", typeof(string));
                for (int i = 0; i < 5; i++)
                {
                    DataRow r = tb.NewRow();
                    r["Data1"] = i;
                    r["Data2"] = i.ToString();
                    tb.Rows.Add(r);
                }
                ds.Tables.Add(tb);

                wr = new XmlTextWriter(_filePath, System.Text.Encoding.UTF8);
                wr.Formatting = Formatting.Indented;
                wr.WriteStartDocument();
                ds.WriteXml(wr);
                wr.WriteEndDocument();
            }
            finally
            {
                if (wr != null)
                {
                    wr.Close();
                }
            }
        }
    }
}