将DataGridView里面的数据导入到Excel中

拉控键，创建一个简单的实例，如下图所示

（1）将数据库数据导入DataGridView中

代码如下所示

        private DataTable _dtInfo = null;
        private DataView _dvInfo = null;
        //private DataGridView dgvInfo = null;
        public Demo()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            _dtInfo = GetData();
            _dvInfo = new DataView(_dtInfo, "", "", DataViewRowState.CurrentRows);
            dataGridView1.DataSource = _dvInfo;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            InitData();
        }

        private void InitData()
        {
            try
            {
                if (_dtInfo != null)
                {
                    _dtInfo.Rows.Clear();
                }
                string con, sql;
                con = @"Data Source=。 ;Initial Catalog=FirstDemo;User ID=sa;Pwd=123456";
                sql = "select * from Student";
                SqlConnection mycon = new SqlConnection(con);
                mycon.Open();
                SqlDataAdapter myda = new SqlDataAdapter(sql, con);
                DataSet myds = new DataSet();
                myda.Fill(_dtInfo);
                ////myda.Fill(myds, "test1");
                _dvInfo = new DataView(_dtInfo, "", "", DataViewRowState.CurrentRows);

                dataGridView1.DataSource = _dvInfo;// myds.Tables["test1"];
                dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;//选定一行
                dataGridView1.ReadOnly = true;//不可编辑
                dataGridView1.AllowUserToAddRows = false;//最后一行不显示
                dataGridView1.RowHeadersVisible = false;//第一列空白的不显示
                mycon.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("错误信息：" + ex.Message, "出现错误");
            }
        }

       
        private DataTable GetData()
        {
            DataTable dtInfo = new DataTable();

            return dtInfo;
        }

（2）将DataGridView上的数据导出生成为一个Excel文件

代码如下所示：

 private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
        /// <summary>
        /// 将数据导入到Excel文件中
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnExport_Click(object sender, EventArgs e)
        {
            string fileName = DateTime.Now.ToString("yyyyMMddhhmmss");
            string saveFileName = "";
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xlsx";
            saveDialog.Filter = "Excel文件|*.xlsx";
            saveDialog.FileName = fileName;
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < 0) return; //被点了取消
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                MessageBox.Show("无法创建Excel对象，您的电脑可能未安装Excel");
                return;
            }
            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook =
                        workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet =
                        (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1 
                                                                                         //写入标题             
            for (int i = 0; i < dataGridView1.ColumnCount; i++)
            { worksheet.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText; }
            //写入数值
            for (int r = 0; r < dataGridView1.Rows.Count; r++)
            {
                for (int i = 0; i < dataGridView1.ColumnCount; i++)
                {
                    worksheet.Cells[r + 2, i + 1] = dataGridView1.Rows[r].Cells[i].Value;
                }
                System.Windows.Forms.Application.DoEvents();
            }
            worksheet.Columns.EntireColumn.AutoFit();//列宽自适应
            MessageBox.Show(fileName + "资料保存成功", "提示", MessageBoxButtons.OK);
            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);  //fileSaved = true;                 
                }
                catch (Exception ex)
                {//fileSaved = false;                      
                    MessageBox.Show("导出文件时出错,文件可能正被打开！
" + ex.Message);
                }
            }
            xlApp.Quit();
            GC.Collect();//强行销毁       
        }