DataGridView导出为EXCEL

教程路径：http://tonyqus.sinaapp.com/tutorial

 方法一：用 NPOI 插件，该方法是生成真正的EXCEL表格，在打开EXCEL时不会弹出警告提示

using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;

public static void Test(DataGridView dv) {

            IWorkbook hssfworkbook = null;
            ISheet sheet = null;
            FileStream fs = null;

            string filePath = "";

            SaveFileDialog file = new SaveFileDialog();

            file.Filter = "*.xls|*.xls";

            if (file.ShowDialog() == DialogResult.Cancel) return;

            filePath = file.FileName;

            try
            {
                hssfworkbook = new HSSFWorkbook();
                sheet = hssfworkbook.CreateSheet("new sheet");
                //设置默认的列宽度
                sheet.DefaultColumnWidth = 17;
                //设置默认的行高度，但貌似没有生效？
                //sheet.DefaultRowHeight = 20 * 256;

                //生成Excel中列头名称
                IRow row = sheet.CreateRow(0);
                for (int i = 0; i < dv.Columns.Count; i++)
                {
                    //输出DataGridView列头名，注：excel第一格为1,1 
                    row.CreateCell(i).SetCellValue(dv.Columns[i].HeaderText);
                }

                //保存数据
                for (int i = 0; i < dv.Rows.Count; i++)
                {
                    row = sheet.CreateRow(i + 1);
                    for (int j = 0; j < dv.Columns.Count; j++)
                    {
                        string str = dv.Rows[i].Cells[j].Value.ToString();
                        row.CreateCell(j).SetCellValue(str);
                    }
                }

                fs = new FileStream(filePath, FileMode.Create);
                hssfworkbook.Write(fs);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message, "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally {

                if (fs != null) fs.Close();
            }
        }

方法二：使用 Microsoft.Office.Interop.Excel.dll 插件，该方法不是生成真正的EXCEL表格，打开的时候会弹出文件与扩展名的格式不一致的警告提示

using Microsoft.Office.Interop.Excel;

        public static void SaveDataToExcel(DataGridView dv)
        {

            string filePath = "";

            SaveFileDialog file = new SaveFileDialog();

            file.Filter = "*.xls|*.xls";

            if (file.ShowDialog() == DialogResult.Cancel) return;

            filePath = file.FileName;

            Microsoft.Office.Interop.Excel.Application excel = null;
            Microsoft.Office.Interop.Excel.Workbook workBook = null;

            //导出到execl   
            try
            {
                //没有数据的话就不往下执行   
                if (dv.Rows.Count <= 0) return;

                //实例化一个Excel.Application对象   
                excel = new Microsoft.Office.Interop.Excel.Application();

                //新增加一个工作簿，Workbook是直接保存，不会弹出保存对话框，加上Application会弹出保存对话框，值为false会报错   
                workBook = excel.Application.Workbooks.Add(true);

                //让后台执行设置为不可见，为true的话会看到打开一个Excel，然后数据在往里写   
                //excel.Visible = false;

                //生成Excel中列头名称
                for (int i = 0; i < dv.Columns.Count; i++)
                {
                    //输出DataGridView列头名，注：excel第一格为1,1 
                    excel.Cells[1, i + 1] = dv.Columns[i].HeaderText;
                }

                //保存数据
                for (int i = 0; i < dv.Rows.Count; i++)
                {
                    for (int j = 0; j < dv.Columns.Count; j++)
                    {
                        string str = dv.Rows[i].Cells[j].Value.ToString();
                        //"'" +是以string形式保存，所以遇到数字不会转成16进制 
                        excel.Cells[i + 2, j + 1] = "'" + str;
                    }
                }

                //设置禁止弹出保存和覆盖的询问提示框   
                excel.DisplayAlerts = false;
                excel.AlertBeforeOverwriting = false;

                workBook.Saved = true;
                workBook.SaveCopyAs(filePath);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                //确保Excel进程关闭
                workBook.Close();
                excel.Quit();
                excel = null;
            }

        }