xml文件的生成与读取 - (第二十六讲)

视频讲解如下：

CSDN源码下载

https://download.csdn.net/download/gs1069405343/19907459

网盘下载，提取码：tqm6

https://pan.baidu.com/s/1UWEw3mdYzHo2i7Ur4zZdNA

这里给大家讲解一下xml文件的生成与读取

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

namespace WindowsFormsApp
{
    public class XmlFile
    {
        // 写入XML文件
        public void WriteXml(string FileName, List<XmlData> datas)
        {
            XmlTextWriter myXmlTextWriter = new XmlTextWriter(FileName, Encoding.UTF8);
            myXmlTextWriter.Formatting = Formatting.Indented;
            myXmlTextWriter.WriteStartDocument(false);
            myXmlTextWriter.WriteStartElement("MyXmlData"); // 标记
            myXmlTextWriter.WriteEndElement();
            myXmlTextWriter.Flush();
            myXmlTextWriter.Close();

            XElement xe = XElement.Load(FileName);
            foreach (XmlData x in datas)
            {
                XElement record = new XElement(
                    new XElement("barcode",
                        new XAttribute("AA", x.aa),
                        new XElement("A1", x.a1),
                        new XElement("A2", x.a2),
                        new XElement("BB",
                            new XElement("B1", x.b1),
                            new XElement("B2", x.b2),
                            new XElement("CC",
                                new XElement("C1", x.c1),
                                new XElement("C2", x.c2)
                                )
                            )
                        ));
                xe.Add(record);
            }
            xe.Save(FileName);
        }

        // 读取XML文件
        public List<XmlData> ReadXml(string FileName)
        {
            List<XmlData> oData = new List<XmlData>();
            XmlDocument xml = new XmlDocument();
            xml.Load(FileName);
            // 得到根节点MyXmlData
            XmlNode xn = xml.SelectSingleNode("MyXmlData");
            // 得到根节点的所有子节点
            XmlNodeList xnl = xn.ChildNodes;
            foreach (XmlNode xn1 in xnl)
            {
                XmlData data = new XmlData();

                // 将节点转换为元素，便于得到节点的属性值
                XmlElement xe = (XmlElement)xn1;
                // 得到barcode节点中AA属性值
                data.aa = xe.GetAttribute("AA").ToString();

                // 得到barcode节点的所有子节点
                XmlNodeList aa = xe.ChildNodes;
                data.a1 = aa.Item(0).InnerText;
                data.a2 = aa.Item(1).InnerText;
                // 从aa节点中取bb
                XmlNodeList bb = aa.Item(2).ChildNodes;
                data.b1 = bb.Item(0).InnerText;
                data.b2 = bb.Item(1).InnerText;
                // 从bb节点中取cc
                XmlNodeList cc = bb.Item(2).ChildNodes;
                data.c1 = cc.Item(0).InnerText;
                data.c2 = cc.Item(1).InnerText;
                oData.Add(data);
            }
            return oData;
        }
    }

    public class XmlData
    {
        public string aa { get; set; }

        public string a1 { get; set; }
        public string a2 { get; set; }

        public string b1 { get; set; }
        public string b2 { get; set; }

        public string c1 { get; set; }
        public string c2 { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

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

        private void button1_Click(object sender, EventArgs e)
        {
            List<XmlData> data = new List<XmlData>();
            for(int i = 0;i<5;i++)
            {
                data.Add(new XmlData()
                {
                    aa = $"AA{i}",
                    a1 = $"A1{i}",
                    a2 = $"A2{i}",
                    b1 = $"B1{i}",
                    b2 = $"B2{i}",
                    c1 = $"C1{i}",
                    c2 = $"C2{i}",
                });
            }
            new XmlFile().WriteXml("my.xml", data);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            List<XmlData> data = new XmlFile().ReadXml("my.xml");
        }
    }
}