c# 高效率导出多维表头excel

  [DllImport("User32.dll", CharSet = CharSet.Auto)]

        public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int ID);

        private void ExportToExcel(string fielName)

        {

            //实例化一个Excel.Application对象    

            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();

         

            try

            {

                if (dgv_Result.DataSource == null)

                    return;

                if (dgv_Result.Rows.Count == 0)

                    return;





                //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    

                Microsoft.Office.Interop.Excel.Workbook xlBook = excel.Workbooks.Add(true);



                //1.添加表头

                excel.Cells[1, 1] = tyclass;

                for (int i = 0; i < dgv_Result.Columns.Count; i++)

                {



                    excel.Cells[2, i + 1] = dgv_Result.Columns[i].Name;

                }





                #region 2.实现Excel多维表头 采用合并单元格的方式

                Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)xlBook.ActiveSheet;

                Microsoft.Office.Interop.Excel.Range excelRange = sheet.get_Range(sheet.Cells[1, 1], sheet.Cells[1, 2]);

                Microsoft.Office.Interop.Excel.Range excelRange1 = sheet.get_Range(sheet.Cells[1, 3], sheet.Cells[1, 4]);

                Microsoft.Office.Interop.Excel.Range excelRange2 = sheet.get_Range(sheet.Cells[1,5], sheet.Cells[1, 6]);

                Microsoft.Office.Interop.Excel.Range excelRange3 = sheet.get_Range(sheet.Cells[1,7], sheet.Cells[1, 8]);

                Microsoft.Office.Interop.Excel.Range excelRange4 = sheet.get_Range(sheet.Cells[1, 2], sheet.Cells[1, 3]);

                Microsoft.Office.Interop.Excel.Range excelRange5 = sheet.get_Range(sheet.Cells[1, 6], sheet.Cells[1, 7]);

                Microsoft.Office.Interop.Excel.Range excelRange6 = sheet.get_Range(sheet.Cells[1, 4], sheet.Cells[1,5]);

                excelRange.Merge(excelRange.MergeCells);

                excelRange1.Merge(excelRange1.MergeCells);

                excelRange4.Merge(excelRange4.MergeCells);

                excelRange2.Merge(excelRange2.MergeCells);

                excelRange3.Merge(excelRange3.MergeCells);

                excelRange5.Merge(excelRange5.MergeCells);

                excelRange6.Merge(excelRange6.MergeCells);

                Microsoft.Office.Interop.Excel.Range columnRange = sheet.get_Range("A1", "H2");   //得到  Range 范围  A-H 表示1-8列，1-2表示跨几行

                 columnRange.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;

                 columnRange.Font.Size = 10;

                 columnRange.Font.Bold = true;

               

                #endregion



                

                #region 3.添加行数据，直接给Range赋值可提高效率



                 Microsoft.Office.Interop.Excel.Range range = sheet.get_Range("A3", "H" + (dgv_Result.Rows.Count + 2).ToString());   //得到  Range 范围 

                string[,] AryData = new string[dgv_Result.Rows.Count-1, dgv_Result.Columns.Count];

                for (int i = 0; i < dgv_Result.Rows.Count - 1; i++)

                {

                    for (int j = 0; j < dgv_Result.Columns.Count; j++)

                    {



                        AryData[i,j] = dgv_Result.Rows[i].Cells[j].Value.ToString();

                    }

                }

                range.Value2 = AryData;

                range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;

                #endregion



                sheet.Cells.Columns.AutoFit();//设置Excel表格的  列宽

                excel.SheetsInNewWorkbook = 1;//设置Excel单元格对齐方式

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

                excel.AlertBeforeOverwriting = false;

                //保存excel文件    

                xlBook.SaveAs(fielName, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

                MessageBox.Show("导出成功！", "提示");

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message, "错误提示");

            }

            finally

            {

                IntPtr pt = new IntPtr(excel.Hwnd);

                int k = 0;

                GetWindowThreadProcessId(pt, out k);

                System.Diagnostics.Process p = System.Diagnostics.Process.GetProcessById(k);

                p.Kill();





            }



        }