C#中EXCEL表格的内容进度条实现

 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 = 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