1、创建普通的XML

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace _03创建XML
{
    class Program
    {
        static void Main(string[] args)
        {
            XmlDocument doc = new XmlDocument();
            XmlDeclaration dec = doc.CreateXmlDeclaration("1.0","utf-8",null);
            doc.AppendChild(dec);

            XmlElement books = doc.CreateElement("Books");
            doc.AppendChild(books);

            XmlElement book1 = doc.CreateElement("Book");
            books.AppendChild(book1);

            XmlElement name1 = doc.CreateElement("Name");
            name1.InnerText = "金瓶梅";
            book1.AppendChild(name1);

            XmlElement price1 = doc.CreateElement("Price");
            price1.InnerText = "10";
            book1.AppendChild(price1);

            XmlElement des1 = doc.CreateElement("Des");
            des1.InnerText = "好看，不解释！";
            book1.AppendChild(des1);

            doc.Save("books.xml");
            Console.WriteLine("保存成功！");
            Console.Read();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<Books>
  <Book>
    <Name>金瓶梅</Name>
    <Price>10</Price>
    <Des>好看，不解释！</Des>
  </Book>
</Books>

2、向XML中追加

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.IO;

namespace _03创建XML
{
    class 追加XML
    {
        public static void ZhuiJiaXml()
        {
            //创建一个xml文档对象
            XmlDocument doc = new XmlDocument();
            //声明根节点
            XmlElement books;
            //判断xml文件是否存在
            if (File.Exists("Books.xml"))
            {
                //如果存在，就进行加载
                doc.Load("Books.xml");
                //将根节点获取到
                books = doc.DocumentElement;
            }
            else
            {
                //如果不存在，就进行创建
                XmlDeclaration dec = doc.CreateXmlDeclaration("1.0",null);
                doc.AppendChild(dec);
                books = doc.CreateElement("Books");
                doc.AppendChild(books);
            }
            XmlElement book1 = doc.CreateElement("Book");
            books.AppendChild(book1);

            XmlElement name1 = doc.CreateElement("Name");
            name1.InnerText = "C#图解教程";
            book1.AppendChild(name1);

            XmlElement price1 = doc.CreateElement("Price");
            price1.InnerText = "100";
            book1.AppendChild(price1);

            doc.Save("Books.xml");
            Console.WriteLine("保存成功！");
            Console.Read();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<Books>
  <Book>
    <Name>金瓶梅</Name>
    <Price>10</Price>
    <Des>好看，不解释！</Des>
  </Book>
  <Book>
    <Name>C#图解教程</Name>
    <Price>100</Price>
  </Book>
</Books>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace _03创建XML
{
    class 创建带属性的xml
    {
        public static void CreateAppendShu()
        {
            XmlDocument doc = new XmlDocument();
            XmlDeclaration dec = doc.CreateXmlDeclaration("1.0",null);
            doc.AppendChild(dec);

            XmlElement order = doc.CreateElement("Order");
            doc.AppendChild(order);

            XmlElement customerName = doc.CreateElement("CustomerName");
            customerName.InnerText = "刘洋";
            order.AppendChild(customerName);

            XmlElement orderNumber = doc.CreateElement("OrderNumber");
            orderNumber.InnerText = "10000001";
            order.AppendChild(orderNumber);

            XmlElement Items = doc.CreateElement("Items");
            order.AppendChild(Items);

            XmlElement orderItem1 = doc.CreateElement("OrderItem");
            //这里是重点！要调用一个SetAttribute方法
            orderItem1.SetAttribute("Name","码表");
            orderItem1.SetAttribute("Count","2");
            Items.AppendChild(orderItem1);

            XmlElement orderItem2 = doc.CreateElement("OrderItem");
            orderItem2.SetAttribute("Name","雨衣");
            orderItem2.SetAttribute("Count","40");
            Items.AppendChild(orderItem2);

            XmlElement orderItem3 = doc.CreateElement("OrderItem");
            orderItem3.SetAttribute("Name","手套");
            orderItem3.SetAttribute("Count","200000000");
            Items.AppendChild(orderItem3);

            doc.Save("Order.xml");
            Console.WriteLine("保存成功！！");
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<Order>
  <CustomerName>刘洋</CustomerName>
  <OrderNumber>10000001</OrderNumber>
  <Items>
    <OrderItem Name="码表" Count="2" />
    <OrderItem Name="雨衣" Count="40" />
    <OrderItem Name="手套" Count="200000000" />
  </Items>
</Order>

4、读取xml文档

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace _03创建XML
{
    class 读取xml
    {
        //读取普通的xml文档
        public static void ReadXml()
        {

            XmlDocument doc = new XmlDocument();
            //加载xml文档
            doc.Load("Books.xml");
            //获取根节点
            XmlElement books = doc.DocumentElement;
            //获取根节点下所有子节点
            XmlNodeList xnl = books.ChildNodes;

            foreach (XmlNode item in xnl)
            {
                Console.WriteLine(item.InnerText);
            }
            Console.Read();
        }

        //读取带有属性的xml文档
        public static void ReadAttributeXml()
        {
            XmlDocument doc = new XmlDocument();
            doc.Load("Order.xml");
            //指定到一个节点下，将那个节点的所有子节点赋给xnl
            XmlNodeList xnl= doc.SelectNodes("/Order/Items/OrderItem");
            foreach (XmlNode item in xnl)
            {
                Console.WriteLine(item.Attributes["Name"].Value);
                Console.WriteLine(item.Attributes["Count"].Value);
            }
            Console.Read();
        }
    }
}

5、删除XML节点

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace _03创建XML
{
    class 删除xml节点
    {
        public static void DeleteXmlNode()
        {
            XmlDocument doc = new XmlDocument();
            doc.Load("Order.xml");
            XmlNode xn= doc.SelectSingleNode("/Order/Items");
            xn.RemoveAll();
            doc.Save("Order.xml");
            Console.WriteLine("删除成功！");
        }
    }
}