/// <summary>

        /// 将datagridview导出为excel文件，导出过程中显示进度条

        /// </summary>

        /// <param name="dgv">DataGridView</param>

        /// <param name="pb">progressBar</param>

        /// <param name="ll">Label</param>

        public static void ExportToExcel(DataGridView dgv, ProgressBar pb, System.Windows.Forms.Label ll)

        {

            System.Data.DataTable dt = dgv.DataSource as System.Data.DataTable;

            if (dt == null) 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|*xls";

            saveDia.Title = "导出为Excel文件";

            saveDia.FileName = string.Format("{0}.xls", DateTime.Now.ToString("yyyyMMddHHmmss"));

            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];

                Microsoft.Office.Interop.Excel.Range range = null;

                long totalCount = dt.Rows.Count;

                pb.Visible = true;//进度条显示

    &nbs