winform

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

using System.Data;                                  // 引用【AD0.NET】命名空间
using System.Data.SqlClient;                 // sql

namespace DataBase
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        
        // 窗体载入
        private void Form1_Load(object sender, EventArgs e)
        {
            //编号, 品名, 规格, 材质, 库存, 价格, 仓库
            this.lstviewRecordData.Items.Clear();
            this.lstviewRecordData.View = View.Details;        // lstviewRecordData视图样式: 详细信息
            this.lstviewRecordData.GridLines = true;              // 网格线 
            this.lstviewRecordData.CheckBoxes = true;         // 复选框
            ColumnHeader ch = new ColumnHeader();
            ch.Text = "编号";                                                         // 标题
            ch.TextAlign = HorizontalAlignment.Center;          // 居中
            ch.Width = 50;                                                            // 宽度
            this.lstviewRecordData.Columns.Add(ch);            // 添加列头
            this.lstviewRecordData.Columns.Add("品名", 80, HorizontalAlignment.Center);
            this.lstviewRecordData.Columns.Add("规格",180, HorizontalAlignment.Center);
            this.lstviewRecordData.Columns.Add("材质", 80, HorizontalAlignment.Center);
            this.lstviewRecordData.Columns.Add("库存", 100, HorizontalAlignment.Center);
            this.lstviewRecordData.Columns.Add("价格", 100, HorizontalAlignment.Center);
            this.lstviewRecordData.Columns.Add("仓库", 100, HorizontalAlignment.Center);
            this.lstviewRecordData.FullRowSelect = true;

        }
        private void btnReadDataBase_Click(object sender, EventArgs e)
        {
            lstviewRecordData.Items.Clear();
            // 绑定数据库
            BindDataBase();
        }

        /// <summary>   绑定数据库
        /// 
        /// </summary>
        private void BindDataBase()
        {
            // 连接指定数据库
            SqlConnection conn = new SqlConnection();

            /***********************************************************************
             *  使用字符串声明连接所需要的信息:
             *      1. 服务器;     
             *      2. 数据库 ;    
             *      3. 验证: 
             *              3.1 Windows本地验证: Integrated Security = true;
             *              3.2 SqlServer验证: user id = 登录名; password = 密码
            ***********************************************************************/
            conn.ConnectionString = "Server = 127.0.0.1; DataBase = DuanLaoYeDataBase;"+
                                    " user id = DuanLaoYe; password = 123456";
            try
            {
                // 打开连接
                conn.Open();
                //MessageBox.Show(conn.State.ToString());       // 测试conn的状态,打开或关闭


                // 构造数据库命令操作对象,用于执行T-SQL语句
                SqlCommand cmd = new SqlCommand();
                // 执行操作的T-SQL语句或者存储过程
                cmd.CommandText = "select * from Steel";
                // 执行操作所需要的连接
                cmd.Connection = conn;


                //声明结果集对象 , 用于检索数据 ; 结果集的来自cmd的ExecuteReader()方法
                SqlDataReader dr = cmd.ExecuteReader();
                // 遍历dr数据 , 判断有无数据可读
                if (dr.HasRows)
                {
                    // 开始更新数据, 挂起lstviewRecordData的UI绘制
                    this.lstviewRecordData.BeginUpdate();
                    while (dr.Read())           // 循环读取所有数据
                    {
                        ListViewItem lvi = new ListViewItem();
                        lvi.Text = dr[0].ToString();
                        for (int i = 1; i <= 6; ++i )
                        {                      
                            lvi.SubItems.Add(dr[i].ToString().Trim());              
                        }
                        this.lstviewRecordData.Items.Add(lvi);
                    }
                    // 结束更新数据, 开始绘制UI(UI一次性绘制)
                    this.lstviewRecordData.EndUpdate();              
                }
                else
                {
                    MessageBox.Show("结果集无数据!");
                }
            }
            catch (SqlException ex)
            {
                MessageBox.Show("数据库操作遇到异常 : " + ex.Message);
            }
            finally
            {
                // 判断当前的conn连接状态, 如果未关闭
                if (conn.State != ConnectionState.Closed)
                {
                    // 则关闭连接
                    conn.Close();               
                }
            }          
        }

        private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (DialogResult.Yes == MessageBox.Show("确定删除当前所有选中数据?", "提示", MessageBoxButtons.YesNo))
            {
                this.lstviewRecordData.BeginUpdate();
                // 遍历选中项
               foreach (ListViewItem lvi in lstviewRecordData.SelectedItems)
               {
                   // 按索引删除选中项
                   //this.lstviewRecordData.Items.RemoveAt(lvi.Index);

                   // 按项删除选中项
                   this.lstviewRecordData.Items.Remove(lvi);
               }
               this.lstviewRecordData.EndUpdate();
            }
        }
    }
}