public  void ExportToExcel()
        {
            DataTable dt = getDataTable();

            if (dt == null)
            {
                MessageBox.Show("没有数据可供导出！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                MessageBox.Show("无法创建Excel对象，可能您的电脑未安装Excel");
                return;
            }
            System.Windows.Forms.SaveFileDialog saveDia = new SaveFileDialog();
            saveDia.Filter = "Excel文件(*.xls)|*.xls";
            saveDia.Title = "导出为Excel文件";
            if (saveDia.ShowDialog() == System.Windows.Forms.DialogResult.OK
             && !string.Empty.Equals(saveDia.FileName))
            {
                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 
                Microsoft.Office.Interop.Excel.Range range = null;
                long totalCount = dt.Rows.Count;
                long rowRead = 0;
                float percent = 0;
                string fileName = saveDia.FileName;

                //写入标题 
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;
                    range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, i + 1];
                    //range.Interior.ColorIndex = 15;//背景颜色 
                    range.Font.Bold = true;//粗体 
                    range.Font.Size = 11;//字体大小 
                    range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;//居中 
                    //加边框 
                    range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);
                    //range.ColumnWidth = 4.63;//设置列宽 
                    //range.EntireColumn.AutoFit();//自动调整列宽 
                    //r1.EntireRow.AutoFit();//自动调整行高 
                }
                //写入内容 

                for (int r = 0; r < dt.DefaultView.Count; r++)
                {
                    this.state.Text = "正在导出数据......已导出" + (r + 1).ToString() + "条/共" + dataGridView1.Rows.Count.ToString() + "条";
                    this.progressBar1.Value = http://www.mamicode.com/r + 1;

                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        worksheet.Cells[r + 2, i + 1] = dt.DefaultView[r][i];
                        range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[r + 2, i + 1];
                        range.Font.Size = 10;//字体大小 
                        //加边框 
                        range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);
                        range.EntireColumn.AutoFit();//自动调整列宽 
                    }
                    rowRead++;
                    percent = ((float)(100 * rowRead)) / totalCount;
                    System.Windows.Forms.Application.DoEvents();
                }
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
                if (dt.Columns.Count > 1)
                {
                    range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
                }
                workbook.Saved = true;
                workbook.SaveCopyAs(fileName);

                workbooks.Close();
                if (xlApp != null)
                {
                    xlApp.Workbooks.Close();
                    xlApp.Quit();
                    int generation = System.GC.GetGeneration(xlApp);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
                    xlApp = null;
                    System.GC.Collect(generation);
                }

                GC.Collect();//强行销毁 
                #region 强行杀死最近打开的Excel进程
                System.Diagnostics.Process[] excelProc = System.Diagnostics.Process.GetProcessesByName("EXCEL");
                System.DateTime startTime = new DateTime();
                int m, killId = 0;
                for (m = 0; m < excelProc.Length; m++)
                {
                    if (startTime < excelProc[m].StartTime)
                    {
                        startTime = excelProc[m].StartTime;
                        killId = m;
                    }
                }
                if (excelProc[killId].HasExited == false)
                {
                    excelProc[killId].Kill();
                }
                #endregion
                if (MessageBox.Show(this, "数据已经成功导出到：" + saveDia.FileName.ToString() + ",是否打开文件？", "导出完成", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
                {
                    System.Diagnostics.Process.Start(saveDia.FileName);
                }
            }
            else
            {
                GC.Collect();//强行销毁 
                #region 强行杀死最近打开的Excel进程
                System.Diagnostics.Process[] excelProc = System.Diagnostics.Process.GetProcessesByName("EXCEL");
                System.DateTime startTime = new DateTime();
                int m, killId = 0;
                for (m = 0; m < excelProc.Length; m++)
                {
                    if (startTime < excelProc[m].StartTime)
                    {
                        startTime = excelProc[m].StartTime;
                        killId = m;
                    }
                }
                if (excelProc[killId].HasExited == false)
                {
                    excelProc[killId].Kill();
                }
                #endregion
            }
            panel2.Visible = false;

}
        #endregion

C#中EXCEL表格的内容进度条实现