ListView 修改SubItem 项

ListView 修改选择项目，必须判断是否选中，否则会出现异常。

if (listView1.SelectedItems.Count > 0)
            {
                txtID.Text = listView1.SelectedItems[0].SubItems[0].Text;
                txtName.Text = listView1.SelectedItems[0].SubItems[1].Text;
                txtPrice.Text = listView1.SelectedItems[0].SubItems[2].Text;
            }

全文代码：

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.Data.SqlClient;

namespace AttachDataBaseDatomuToListView
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            btnSearch.Click += BtnSearch_Click;
            btnCancel.Click += BtnCancel_Click;
            btnModfy.Click += BtnModfy_Click;
            listView1.SelectedIndexChanged += ListView1_SelectedIndexChanged;
            this.Load += Form1_Load;
        }

        private void BtnModfy_Click(object sender, EventArgs e)
        {
            SqlConnection connection;
            string strUpdate = "Update tb_02 set Approp='" + txtPrice.Text.Trim() + "' where ID='" + txtID.Text.Trim() + "'";
            using (connection = new SqlConnection("server=.;pwd=test;user=sa;database=db_02"))
            {
                connection.Open();
                SqlCommand command = new SqlCommand(strUpdate, connection);
                if (command.ExecuteNonQuery() > 0)
                {
                    MessageBox.Show(string.Format("编码为:{0}的产品价格已经更新为{1}", txtID.Text.Trim(), txtPrice.Text.Trim()));
                }
             }
            ListViewDisplayDate(listView1);
        }

        private void ListView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (listView1.SelectedItems.Count > 0)
            {
                txtID.Text = listView1.SelectedItems[0].SubItems[0].Text;
                txtName.Text = listView1.SelectedItems[0].SubItems[1].Text;
                txtPrice.Text = listView1.SelectedItems[0].SubItems[2].Text;
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            listView1.SmallImageList = imageList1;
            listView1.View = View.Details;
            //listView1.FullRowSelect = true;
            //listView1.LabelEdit = true;
            
            ColumnHeader columnHeader1 = new ColumnHeader();
            columnHeader1.TextAlign = HorizontalAlignment.Center;
            columnHeader1.Text = "商品编码";
            columnHeader1.Width = 100;
            ColumnHeader columnHeader2 = new ColumnHeader();
            columnHeader2.TextAlign = HorizontalAlignment.Center;
            columnHeader2.Text = "商品名称";
            columnHeader2.Width = 120;
            ColumnHeader columnHeader3 = new ColumnHeader();
            columnHeader3.TextAlign = HorizontalAlignment.Center;
            columnHeader3.Text = "商品价格";
            columnHeader3.Width = 100;
            listView1.Columns.Add(columnHeader1);
            listView1.Columns.Add(columnHeader2);
            listView1.Columns.Add(columnHeader3);
        }

        private void BtnCancel_Click(object sender, EventArgs e)
        {
            this.Close();
            Application.Exit();
        }

        private void BtnSearch_Click(object sender, EventArgs e)
        {
            ListViewDisplayDate(listView1);
        }

        private void ListViewDisplayDate(ListView listView)
        {
            int imageIndex = 0;
            listView.Items.Clear();
            SqlConnection connection = new SqlConnection("server=.;pwd=test;user=sa;database=db_02");
            connection.Open();
            SqlCommand command = new SqlCommand("select *  from tb_02", connection);
            SqlDataReader reader = command.ExecuteReader();
            //listView1.View = View.Details;
            //listView1.FullRowSelect = true;
            //listView1.BeginUpdate();
            while (reader.Read())
            {
                ListViewItem viewItem = new ListViewItem(reader[0].ToString());
                viewItem.ImageIndex = imageIndex;
                viewItem.SubItems.Add(reader[1].ToString());
                viewItem.SubItems.Add(reader[2].ToString());
                listView.Items.Add(viewItem);
                imageIndex++;
            }
            reader.Close();
            connection.Close();
        }
    }
}

效果：