[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();             }         }