步步为营-23-通过GridView实现增删改

说明:把xml中的数据放入到数据源list中然后显示到gridview中,参考上一节内容

1 UI页面 

2创建student类

 public class Student
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
        public char Gender { get; set; }
       
    }

3把Person.xml放置debug目录下

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;

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

        private void Form1_Load(object sender, EventArgs e)
        {
            //1创建存储对象集合
            List<Student> listStudents = new List<Student>();

            //开始读取数据 赋值给集合中的对象
            XmlDocument doc = new XmlDocument();
            doc.Load("Person.xml");

            //获得根节点
            XmlElement person = doc.DocumentElement;
            //获取根节点的子节点
            XmlNodeList students = person.ChildNodes;

            foreach (XmlNode item in students)
            {
                //从xml文档中将数据赋值给集合中的Student对象
                listStudents.Add(new Student(){
                    ID = Convert.ToInt32(item.Attributes["ID"].Value),
                    Name = item["Name"].InnerText,
                    Age = Convert.ToInt32(item["Age"].InnerText),
                    Gender = Convert.ToChar(item["Gender"].InnerText)
                });
            }

            //将数据显示到dataGridView
            dataGridView1.DataSource = listStudents;
        }
    }
}

4进一步修改UI显示

  　　　　//将数据显示到dataGridView
            dataGridView1.DataSource = listStudents;
            //取消第一列
            dataGridView1.RowHeadersVisible = false;
            //单击时,行选中
            dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

5新增

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

namespace XML_GridView
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //1创建xml对象
        XmlDocument doc = new XmlDocument();
        private void Form1_Load(object sender, EventArgs e)
        {
            //1创建存储对象集合
            List<Student> listStudents = new List<Student>();

            //开始读取数据 赋值给集合中的对象
            XmlDocument doc = new XmlDocument();
            doc.Load("Person.xml");

            //获得根节点
            XmlElement person = doc.DocumentElement;
            //获取根节点的子节点
            XmlNodeList students = person.ChildNodes;

            foreach (XmlNode item in students)
            {
                //从xml文档中将数据赋值给集合中的Student对象
                listStudents.Add(new Student(){
                    ID = Convert.ToInt32(item.Attributes["ID"].Value),
                    Name = item["Name"].InnerText,
                    Age = Convert.ToInt32(item["Age"].InnerText),
                    Gender = Convert.ToChar(item["Gender"].InnerText)
                });
            }

            //将数据显示到dataGridView
            dataGridView1.DataSource = listStudents;
            //取消第一列
            dataGridView1.RowHeadersVisible = false;
            //单击时,行选中
            dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

            dataGridView1.ClearSelection();
        }

        #region 00 单击确定按钮触发事件
        private void btnAdd_Click(object sender, EventArgs e)
        {
            int Id;
            if (!int.TryParse(txtID.Text.Trim(), out Id))
            {
                MessageBox.Show("ID请输入正整数");
                return;
            }
            if (File.Exists("Person.xml"))
            {
                //判断student ID是否存在
                if (IsExist())
                {
                    MessageBox.Show("ID已存在");
                    return;
                }
                //添加节点                
                doc.Load("Person.xml");
                XmlElement person = doc.DocumentElement;
                AddNode(person);
            }
            else
            {
                //创建文件--同时把当前页面的Student信息保存到文件中
                CreateFile();
            }
            doc.Save("Person.xml");
            //刷新界面
            Form1_Load( sender,  e);
            MessageBox.Show("保存成功!");
        } 
        #endregion
        #region 01创建文件

        public void CreateFile()
        {
            //1创建声明信息
            XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "utf-8", null);
            doc.AppendChild(dec);
            //2创建person根节点
            XmlElement person = doc.CreateElement("Person");
            doc.AppendChild(person);
            AddNode(person);
        }
        #endregion

        #region  02添加节点
        private void AddNode(XmlElement person)
        {
            //3创建Student子节点
            XmlElement student = doc.CreateElement("Student");
            person.AppendChild(student);
            //4Student子节点设置属性Id
            student.SetAttribute("ID", txtID.Text.Trim());
            //5Student添加Name节点
            XmlElement name = doc.CreateElement("Name");
            name.InnerText = txtName.Text.Trim();
            student.AppendChild(name);
            //5Student添加Age节点
            XmlElement age = doc.CreateElement("Age");
            age.InnerText = txtAge.Text.Trim();
            student.AppendChild(age);
            //6Student添加Gender节点
            XmlElement gender = doc.CreateElement("Gender");
            if (RDMan.Checked == true)
            {
                gender.InnerText = "男";
            }
            else
            {
                gender.InnerText = "女";
            }
            student.AppendChild(gender);
        }
        #endregion

        #region 03判断studentID是否存在
        public bool IsExist()
        {
            doc.Load("Person.xml");
            //1 获取根节点
            XmlElement person = doc.DocumentElement;
            //2 获取所有student的属性
            XmlNodeList students = person.ChildNodes;
            List<string> listID = new List<string>();
            foreach (XmlNode item in students)
            {
                listID.Add(item.Attributes["ID"].Value);
            }
            if (listID.Contains(txtID.Text))
            {
                return true;
            }
            return false;
        }
        #endregion
      
    }
}

6 删除

首先添加一个右击菜单,弹出删除按钮

 #region 04删除按钮触发事件
        private void Delete_Click(object sender, EventArgs e)
        {
            //1获得当前选中行的id
            string id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            //2 根据ID进行删除
            doc.Load("Person.xml");
            XmlElement person = doc.DocumentElement;
            XmlNode student = person.SelectSingleNode("/Person/Student[@ID=" + id + "]");
            person.RemoveChild(student);
           
            doc.Save("Person.xml");
            LoadData();
            MessageBox.Show("删除成功");
        } 
        #endregion

7修改,添加行双击事件

        #region 05双击后给文本框赋值
        private void Row_DoubleClick(object sender, EventArgs e)
        {
            //将选中行的数据赋值给文本框
            txtID.Text = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            txtName.Text = dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
            txtAge.Text = dataGridView1.SelectedRows[0].Cells[2].Value.ToString();
            string gender = dataGridView1.SelectedRows[0].Cells[3].Value.ToString();
            if (gender == "男")
            {
                RDMan.Checked = true;
            }
            else
            {
                RDFemale.Checked = true;
            }
        } 
        #endregion

        #region 06单击确定按钮--进行修改
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            //1ID不可更改
            if (txtID.Text != dataGridView1.SelectedRows[0].Cells[0].Value.ToString())
            {
                MessageBox.Show("ID不可更改");
                return;
            }
            
            //2 根据ID进行更新
            doc.Load("Person.xml");
            XmlElement person = doc.DocumentElement;
            XmlNode student = person.SelectSingleNode("/Person/Student[@ID=" + txtID.Text + "]");
            student["Name"].InnerXml = txtName.Text;
            student["Age"].InnerXml = txtAge.Text;
            student["Gender"].InnerXml = RDMan.Checked ? "男" : "女";           
            doc.Save("Person.xml");
            LoadData();
            MessageBox.Show("修改成功");
        } 
        #endregion

总代码

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

namespace XML_GridView
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //1创建xml对象
        XmlDocument doc = new XmlDocument();
        private void Form1_Load(object sender, EventArgs e)
        {
            LoadData();
        }
        
        #region 000DataGridView加载数据
        private void LoadData()
        {
            //1创建存储对象集合
            List<Student> listStudents = new List<Student>();

            //开始读取数据 赋值给集合中的对象
            XmlDocument doc = new XmlDocument();
            doc.Load("Person.xml");

            //获得根节点
            XmlElement person = doc.DocumentElement;
            //获取根节点的子节点
            XmlNodeList students = person.ChildNodes;

            foreach (XmlNode item in students)
            {
                //从xml文档中将数据赋值给集合中的Student对象
                listStudents.Add(new Student()
                {
                    ID = Convert.ToInt32(item.Attributes["ID"].Value),
                    Name = item["Name"].InnerText,
                    Age = Convert.ToInt32(item["Age"].InnerText),
                    Gender = Convert.ToChar(item["Gender"].InnerText)
                });
            }

            //将数据显示到dataGridView
            dataGridView1.DataSource = listStudents;
            //取消第一列
            dataGridView1.RowHeadersVisible = false;
            //单击时,行选中
            dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

            dataGridView1.ClearSelection();
        } 
        #endregion

        #region 00 单击确定按钮触发事件
        private void btnAdd_Click(object sender, EventArgs e)
        {
            int Id;
            if (!int.TryParse(txtID.Text.Trim(), out Id))
            {
                MessageBox.Show("ID请输入正整数");
                return;
            }
            if (File.Exists("Person.xml"))
            {
                //判断student ID是否存在
                if (IsExist())
                {
                    MessageBox.Show("ID已存在");
                    return;
                }
                //添加节点                
                doc.Load("Person.xml");
                XmlElement person = doc.DocumentElement;
                AddNode(person);
            }
            else
            {
                //创建文件--同时把当前页面的Student信息保存到文件中
                CreateFile();
            }
            doc.Save("Person.xml");
            //刷新界面
            LoadData();
            MessageBox.Show("保存成功!");
        } 
        #endregion
        #region 01创建文件

        public void CreateFile()
        {
            //1创建声明信息
            XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "utf-8", null);
            doc.AppendChild(dec);
            //2创建person根节点
            XmlElement person = doc.CreateElement("Person");
            doc.AppendChild(person);
            AddNode(person);
        }
        #endregion

        #region  02添加节点
        private void AddNode(XmlElement person)
        {
            //3创建Student子节点
            XmlElement student = doc.CreateElement("Student");
            person.AppendChild(student);
            //4Student子节点设置属性Id
            student.SetAttribute("ID", txtID.Text.Trim());
            //5Student添加Name节点
            XmlElement name = doc.CreateElement("Name");
            name.InnerText = txtName.Text.Trim();
            student.AppendChild(name);
            //5Student添加Age节点
            XmlElement age = doc.CreateElement("Age");
            age.InnerText = txtAge.Text.Trim();
            student.AppendChild(age);
            //6Student添加Gender节点
            XmlElement gender = doc.CreateElement("Gender");
            if (RDMan.Checked == true)
            {
                gender.InnerText = "男";
            }
            else
            {
                gender.InnerText = "女";
            }
            student.AppendChild(gender);
        }
        #endregion

        #region 03判断studentID是否存在
        public bool IsExist()
        {
            doc.Load("Person.xml");
            //1 获取根节点
            XmlElement person = doc.DocumentElement;
            //2 获取所有student的属性
            XmlNodeList students = person.ChildNodes;
            List<string> listID = new List<string>();
            foreach (XmlNode item in students)
            {
                listID.Add(item.Attributes["ID"].Value);
            }
            if (listID.Contains(txtID.Text))
            {
                return true;
            }
            return false;
        }
        #endregion

        #region 04删除按钮触发事件
        private void Delete_Click(object sender, EventArgs e)
        {
            //1获得当前选中行的id
            string id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            //2 根据ID进行删除
            doc.Load("Person.xml");
            XmlElement person = doc.DocumentElement;
            XmlNode student = person.SelectSingleNode("/Person/Student[@ID=" + id + "]");
            person.RemoveChild(student);
           
            doc.Save("Person.xml");
            LoadData();
            MessageBox.Show("删除成功");
        } 
        #endregion

        #region 05双击后给文本框赋值
        private void Row_DoubleClick(object sender, EventArgs e)
        {
            //将选中行的数据赋值给文本框
            txtID.Text = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            txtName.Text = dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
            txtAge.Text = dataGridView1.SelectedRows[0].Cells[2].Value.ToString();
            string gender = dataGridView1.SelectedRows[0].Cells[3].Value.ToString();
            if (gender == "男")
            {
                RDMan.Checked = true;
            }
            else
            {
                RDFemale.Checked = true;
            }
        } 
        #endregion

        #region 06单击确定按钮--进行修改
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            //1ID不可更改
            if (txtID.Text != dataGridView1.SelectedRows[0].Cells[0].Value.ToString())
            {
                MessageBox.Show("ID不可更改");
                return;
            }
            
            //2 根据ID进行更新
            doc.Load("Person.xml");
            XmlElement person = doc.DocumentElement;
            XmlNode student = person.SelectSingleNode("/Person/Student[@ID=" + txtID.Text + "]");
            student["Name"].InnerXml = txtName.Text;
            student["Age"].InnerXml = txtAge.Text;
            student["Gender"].InnerXml = RDMan.Checked ? "男" : "女";           
            doc.Save("Person.xml");
            LoadData();
            MessageBox.Show("修改成功");
        } 
        #endregion




    }
}