XDocument

XDocument学习(Winform)

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

 namespace _01XDocument
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }
         //2017-12-14 再次写一遍
         Dictionary<string, Person> dict = new Dictionary<string, Person>();

         private void Form1_Load(object sender, EventArgs e)
         {
             XDocument xDoc = XDocument.Load("ListPerson.xml");
             XElement root = xDoc.Root;

             foreach (var item in root.Elements("Person"))
             {
                 Person model = new Person();
                 model.Id = item.Attribute("Id").Value;
                 model.Name = item.Element("Name").Value;
                 model.Age = int.Parse(item.Element("Age").Value);
                 model.Email = item.Element("Email").Value;

                 //加载数据
                 dict.Add(model.Id,model);
                 listBox.Items.Add(model);
             }
         }

         private void btnAdd_Click(object sender, EventArgs e)
         {
             Person model = new Person();
             model.Id = txtId.Text;
             model.Name = txtName.Text;
             model.Age = int.Parse(txtAge.Text);
             model.Email = txtEmail.Text;

             if (btnAdd.Text=="修改")
             {
                 dict[model.Id] = model;
                 listBox.Items[listBox.SelectedIndex] = model;
             }
             else
             {
                 //增加
                 dict.Add(model.Id,model);
                 listBox.Items.Add(model);
             }
             //清除文本框的值
             ClearTextBox();
             btnAdd.Text = "添加";
             txtId.Enabled = true;
         }
         private void btnExit_Click(object sender, EventArgs e)
         {
             this.Close();
         }

         /// <summary>
         /// 清空
         /// </summary>
         private void ClearTextBox()
         {
             foreach (var item in Controls)
             {
                 if (item is TextBox)
                 {
                     ((TextBox)item).Text = string.Empty;
                 }
             }
         }

         private void Form1_FormClosing(object sender, FormClosingEventArgs e)
         {
             //关闭时候，将Dictionary中数据保存在ListPerson.xml
             XDocument xDoc = new XDocument();
             XElement root = new XElement("ListPerson");
             xDoc.Add(root);

             foreach (KeyValuePair<string,Person> item in dict)
             {
                 XElement person = new XElement("Person");
                 person.SetAttributeValue("Id",item.Value.Id);
                 person.SetElementValue("Name",item.Value.Name);
                 person.SetElementValue("Age",item.Value.Age);
                 person.SetElementValue("Email",item.Value.Email);

                 root.Add(person);
             }
             xDoc.Save("ListPerson.xml");
         }
         private void listBox_SelectedIndexChanged(object sender, EventArgs e)
         {
             Person model = listBox.SelectedItem as Person;
             txtId.Text = model.Id;
             txtName.Text = model.Name;
             txtAge.Text = model.Age.ToString();
             txtEmail.Text = model.Email;

             btnAdd.Text = "修改";
             txtId.Enabled = false;
         }

         /// <summary>
         /// 构造Person类
         /// </summary>
         public class Person
         {
             public Person()
             {

             }
             public Person(string id, string name, int age, string email)
             {
                 this.Id = id;
                 this.Name = name;
                 this.Age = age;
                 this.Email = email;
             }
             public string Id { get; set; }
             public string Name { get; set; }
             public int Age { get; set; }
             public string Email { get; set; }
             public override string ToString()
             {
                 //return base.ToString();
                 return this.Name;
             }
         }

     }
 }