public bool DataSetToExcel(DataSet dataSet, string fileName, bool isShowExcle)
        {
           
            if (File.Exists(fileName))
            {
                File.Delete(fileName);
            }
            DataTable dataTable = dataSet.Tables[0];
            int rowNumber = dataTable.Rows.Count;//不包括字段名
            int columnNumber = dataTable.Columns.Count;

            //if (rowNumber == 0)
            //{
            //    MessageBox.Show("没有任何数据可以导入到Excel文件！");
            //    return false;
            //}

            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
            Microsoft.Office.Interop.Excel.Workbook workBook = excel.Application.Workbooks.Add(true);
            //Microsoft.Office.Interop.Excel.Range excelR = null;
            //Microsoft.Office.Interop.Excel.Worksheet excelWs = null;
            excel.Visible = false;//是否打开该Excel文件

            //excelWs = (Microsoft.Office.Interop.Excel.Worksheet)(workBook.Sheets.get_Item(1));//选择第一张表
            ////向Excel中添加列名
            //    for (int i = 0; i < dataTable.Columns.Count; i++)
            //    {
            //        string rangeName = ((Char)(i + 65)).ToString() + "1";       //计算出单元格的位置（例：第一行第二列在Excel中为B1，即为值为1+65的字符+"1"。）
            //        excelR = excelWs.get_Range(rangeName);
            //        excelR.Value = http://www.mamicode.com/dataTable.Columns[i].ColumnName; //在对应单元格中写入值
            //    }
            string[] Colum_Name = { "FBCPZ", "FBCPHY", "JSCPZ", "JSCPHY", "ZHXGR", "ZHXGSJ", " XH" };
            for (int i = 0; i < columnNumber; i++)
            {
                excel.Cells[1, i + 1] = dataTable.Columns[i].ColumnName;
            }
            //填充数据
            for (int i = 0; i < rowNumber; i++)
            {
                for (int j = 0; j < columnNumber; j++)
                {
                    excel.Cells[i + 2, j + 1] = dataTable.Rows[i].ItemArray[j];
                }
            }

            //string fileName = path + "\\" + DateTime.Now.ToString().Replace(‘:‘, ‘_‘) + ".xls";
            workBook.SaveAs(fileName, Microsoft.Office.Interop.Excel.XlFileFormat.xlAddIn, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

            try
            {
                workBook.Saved = true;
                excel.UserControl = false;
                //excelapp.Quit();
            }
            //catch (Exception exception)
            //{
            //    MessageBox.Show(exception.Message);
            //}
            finally
            {
                workBook.Close(Microsoft.Office.Interop.Excel.XlSaveAction.xlSaveChanges, Missing.Value, Missing.Value);
                excel.Quit();
            }

            if (isShowExcle)
            {
                System.Diagnostics.Process.Start(fileName);
            }

            //向客户端发送文件...
            Response.Clear();
            Response.AddHeader("Content-Disposition", "attachment;filename=excel.xls");     //设置回发内容为Excel
            Response.ContentType = "application/ms-excel";
            Response.WriteFile(fileName);                                        //把刚刚生成的Excel文件写入Http流
            Response.End();
            return true;
        }

导出excel