Name	btn_deleteDataItem	btn_addDataItem	btn_updataToDatabase	btn_ouputToExcel	btn_refreshDataID
Text	删除数据记录	增加数据记录	更新数据到数据库	输出数据到excel	刷新数据ID
AutoSize	true	true	true	true	true
Anchor	Right	Right	Right	Right	Right

2 实现代码

2.1 名称空间引用

添加名称空间引用：using System.Data.OleDb; //连接Access数据库使用

添加名称空间引用：using System.Threading; //导出到excel使用

添加名称空间引用：using Excel = Microsoft.Office.Interop.Excel;

C#编程学习18：使用多文档窗体框架利用DataGridView对Access数据表进行增删改及导出excel操作

2.2 全局变量定义

数据库链接字符串全局变量：

string connectStr= @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=你的数据库mdb文件路径\Database1.mdb";

存放数据的中介变量

System.Data.DataTable dt = new System.Data.DataTable(); //注：此处与Excel的名称空间冲突，故使用全名

2.3 在窗体Load事件中添加代码显示数据

        //加载数据库
        private void dataBase_Load(object sender, EventArgs e)
        {
            OleDbConnection connection = new OleDbConnection(connectStr);
            connection.Open();

            OleDbCommand cmd = connection.CreateCommand();
            cmd.CommandText = "select * from fruit";

            OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
            DataSet ds = new DataSet();
            adapter.Fill(ds);

            dt = ds.Tables[0];
            dataGridView1.DataSource = dt;

            connection.Close();
            cmd.Dispose();
            connection.Dispose();
        }

2.4 数据库更新代码

//更新数据到数据库中
   private void btn_updataToDatabase_Click(object sender, EventArgs e)
        {
            

            OleDbConnection connection = new OleDbConnection(connectStr);
            connection.Open();

            OleDbCommand cmd = connection.CreateCommand();
            cmd.CommandText = "select * from fruit";

            OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);

            OleDbCommandBuilder cmdBulid = new OleDbCommandBuilder(adapter);
            adapter.DeleteCommand = cmdBulid.GetDeleteCommand();
            adapter.InsertCommand = cmdBulid.GetInsertCommand();
            adapter.UpdateCommand = cmdBulid.GetUpdateCommand();

            adapter.Update((System.Data.DataTable)dataGridView1.DataSource);

            adapter.Dispose();
            cmdBulid.Dispose();
            cmd.Dispose();
            connection.Dispose();


        }

2.5 删除DataGridView数据记录代码

        //删除dataGridView中的记录
        private void btn_deleteDataItem_Click(object sender, EventArgs e)
        {
            int cnt = dataGridView1.SelectedRows.Count;
            for (int i = 0; i < cnt; i++)
            {
                DataRowView drv = dataGridView1.SelectedRows[i].DataBoundItem as DataRowView;
                drv.Delete();
            }
        }

2.6 更新数据库代码

        //更新数据到数据库中
        private void btn_updataToDatabase_Click(object sender, EventArgs e)
        {
            

            OleDbConnection connection = new OleDbConnection(connectStr);
            connection.Open();

            OleDbCommand cmd = connection.CreateCommand();
            cmd.CommandText = "select * from fruit";

            OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);

            OleDbCommandBuilder cmdBulid = new OleDbCommandBuilder(adapter);
            adapter.DeleteCommand = cmdBulid.GetDeleteCommand();
            adapter.InsertCommand = cmdBulid.GetInsertCommand();
            adapter.UpdateCommand = cmdBulid.GetUpdateCommand();

            adapter.Update((System.Data.DataTable)dataGridView1.DataSource);

            adapter.Dispose();
            cmdBulid.Dispose();
            cmd.Dispose();
            connection.Dispose();


        }

2.7 输出到Excel代码

//导出数据到Excel表格中
        private void btn_ouputToExcel_Click(object sender, EventArgs e)
        {
            SaveFileDialog saveDlg = new SaveFileDialog();
            saveDlg.Filter = "*.xls|*.xls";
            string outputStr;
            if (saveDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {

                Excel._Application myExcel;
                ThreadPool.QueueUserWorkItem(
                    (pp) => {
                        myExcel = new Microsoft.Office.Interop.Excel.Application();
                        Excel.Workbook p_wk = myExcel.Workbooks.Add();
                        Excel.Worksheet p_ws = (Excel.Worksheet)p_wk.Worksheets.Add();

                        for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                        {
                            p_ws.Cells[i + 1, 1] = dataGridView1.Rows[i].Cells[0].Value.ToString();
                            p_ws.Cells[i + 1, 2] = dataGridView1.Rows[i].Cells[1].Value.ToString();
                            p_ws.Cells[i + 1, 3] = dataGridView1.Rows[i].Cells[2].Value.ToString();
                        }
                        p_wk.SaveAs(saveDlg.FileName);
                        ((Excel._Application)myExcel.Application).Quit();
                        this.Invoke((MethodInvoker)(() => { MessageBox.Show("导出到Excel成功", "提示信息"); }));
                    } );
            }
            outputStr = saveDlg.FileName;
            saveDlg.Dispose();
         
        }