.Net高级技术 第五章：xml
XML 教程
http://www.w3school.com.cn/xml/index.asp
1.读取XML
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
namespace _01_XML
{
class Program
{
static void Main(string[] args)
{
//加载
XDocument xdoc = XDocument.Load("first.xml");
XElement xel= xdoc.Root; //根元素
//Console.WriteLine(xele);
IEnumerable<XElement> ies= xel.Elements();
foreach (XElement item in ies)
{
//Console.WriteLine(item.Name);
//获取属性的值
Console.WriteLine("======" + item.Name + ":" + item.Attribute("id").Value + "======");
//获取student元素下的所有的元素的值
Console.WriteLine(item.Element("name").Value);
Console.WriteLine(item.Element("gender").Value);
Console.WriteLine(item.Element("age").Value);
}
Console.ReadKey();
}
}
}
first.xml
<?xml version="1.0" encoding="utf-8" ?> <class> <student id="0001"> <name>yokin</name> <gender>男</gender> <age>25</age> </student> <student id="0002"> <name>linyq</name> <gender>女</gender> <age>29</age> </student> <student id="0003"> <name>linyongqin</name> <gender>男</gender> <age>20</age> </student> </class>
2.写入XML
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
namespace _02_XML写入
{
class Program
{
static void Main(string[] args)
{
XDocument xdoc = new XDocument();
//根元素
XElement root = new XElement("school");
//子元素
XElement cls = new XElement("class");
//设置class中的属性
cls.SetAttributeValue("id", "001");
//创建一个student标签
XElement stu = new XElement("student");
//设置student标签中的一些元素和值
stu.SetElementValue("name", "yokin");
stu.SetElementValue("gender", "男");
stu.SetElementValue("age", 29);
//标签添加到子元素中
cls.Add(stu);
//子元素添加到根元素中
root.Add(cls);
//根元素添加到xdoc
xdoc.Add(root);
//保存
xdoc.Save("");
Console.WriteLine("写入成功");
Console.ReadKey();
}
}
}
MySchool.xml
<?xml version="1.0" encoding="utf-8"?> <school> <class id="001"> <student> <name>yokin</name> <gender>男</gender> <age>29</age> </student> </class> </school>
3.XML 增删改查（CRUD）
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;
using System.Xml.Linq;
namespace XML_CRUD
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
LoadFiles();
}
/// <summary>
/// 加载数据
/// </summary>
private void LoadFiles()
{
List<StudentModel> list = new List<StudentModel>();
XDocument xDoc = XDocument.Load("student.xml");
XElement root = xDoc.Root;
foreach (XElement item in root.Elements())
{
StudentModel model = new StudentModel();
model.stuID = item.Attribute("id").Value;
model.stuName = item.Element("name").Value;
model.stuGender = item.Element("gender").Value;
model.stuAge = item.Element("age").Value;
list.Add(model);
}
gvwList.DataSource = list;
if (list.Count > 0)
{
gvwList.SelectedRows[0].Selected = false;
}
}
/// <summary>
/// 新增
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnAdd_Click(object sender, EventArgs e)
{
XDocument xDoc = XDocument.Load("student.xml");
XElement root = xDoc.Root;
XElement student = new XElement("student");
student.SetAttributeValue("id", txtID.Text);
student.SetElementValue("name", txtName.Text);
string gender = rbtnMan.Checked ? "男" : "女";
student.SetElementValue("gender", gender);
student.SetElementValue("age", txtAge.Text);
root.Add(student);
xDoc.Save("student.xml");
LoadFiles();
txtID.Text = "";
txtName.Text = "";
rbtnMan.Checked = true;
txtAge.Text = "";
MessageBox.Show("新增成功");
}
/// <summary>
/// 删除
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void delete_Click(object sender, EventArgs e)
{
if (gvwList.SelectedRows.Count > 0)
{
string id = gvwList.SelectedRows[0].Cells[0].Value.ToString();
XDocument xDoc = XDocument.Load("student.xml");
XElement root = xDoc.Root;
XElement student = root.Elements("student").Where(x => x.Attribute("id").Value == id).Single();
student.Remove();
xDoc.Save("student.xml");
LoadFiles();
MessageBox.Show("删除成功");
}
else
{
MessageBox.Show("请选择要删除的行");
}
}
/// <summary>
/// 获取选中对象的值
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void update_Click(object sender, EventArgs e)
{
DataGridViewRow row = gvwList.SelectedRows[0];
txtID.Text = row.Cells[0].Value.ToString();
txtID.ReadOnly = true;
txtName.Text = row.Cells[1].Value.ToString();
if (row.Cells[2].Value.ToString()=="男")
{
rbtnMan.Checked = true;
}
else
{
rbtnWoman.Checked = true;
}
txtAge.Text = row.Cells[3].Value.ToString();
}
/// <summary>
/// 修改
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnUpdate_Click(object sender, EventArgs e)
{
XDocument xDoc = XDocument.Load("student.xml");
XElement root = xDoc.Root;
XElement student = root.Elements("student").Where(x => x.Attribute("id").Value.ToString() == txtID.Text).Single();
student.SetElementValue("name", txtName.Text);
string gender = rbtnMan.Checked ? "男" : "女";
student.SetElementValue("gender", gender);
student.SetElementValue("age", txtAge.Text);
xDoc.Save("student.xml");
LoadFiles();
txtID.Text = "";
txtID.ReadOnly = false;
txtName.Text = "";
rbtnMan.Checked = true;
txtAge.Text = "";
MessageBox.Show("修改成功");
}
}
}
student.xml
<?xml version="1.0" encoding="gb2312"?> <class> <student id="001"> <name>卡卡西</name> <gender>男</gender> <age>23</age> </student> <student id="002"> <name>大蛇丸</name> <gender>男</gender> <age>42</age> </student> <student id="003"> <name>鸣人</name> <gender>男</gender> <age>16</age> </student> <student id="004"> <name>小花</name> <gender>男</gender> <age>15</age> </student> </class>
