public static void pub_excel_export(GridView gv)
        {
            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.ApplicationClass();
            Microsoft.Office.Interop.Excel.Workbooks workbooks = excel.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;

int int_cell_idx = 1;
for (int i = 0; i < gv.Columns.Count; i++)
            {
                worksheet.Cells[1, int_cell_idx] = gv.Columns[i].HeaderText;
                range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, int_cell_idx];
                range.Interior.ColorIndex = 15;
                range.Font.Bold = true;
                range.ColumnWidth = 16;
                range.RowHeight = 25;
                int_cell_idx++;
            }
//显示，没有处理退出进程问题
            excel.Visible = true;
        }