public static void ToExcel(DataGridView dgv, string name)
        {
            try
            {
                //总可见列数，总可见行数
                int colCount = dgv.Columns.GetColumnCount(DataGridViewElementStates.Visible);
                int rowCount = dgv.Rows.GetRowCount(DataGridViewElementStates.Visible);

                //dataGridView 没有数据提示
                if (dgv.Rows.Count == 0 || rowCount == 0)
                {
                    MessageBox.Show("列表中没有数据无法导出!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
                SaveFileDialog save = new SaveFileDialog();
                save.Filter = "excel files(*.xls)|*.xls";
                save.Title = "请选择要导出数据的位置";
                save.FileName = name + DateTime.Now.ToLongDateString();
                save.InitialDirectory = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Desktop);
                if (save.ShowDialog() == DialogResult.OK)
                {
                    XlsDocument xls = new XlsDocument();//创建空xls文档

                    xls.FileName = save.FileName;//保存路径，如果直接发送到客户端的话只需要名称 生成名称

                    Worksheet sheet = xls.Workbook.Worksheets.Add(name); //创建一个工作页为Dome          

                    //设置文档列属性 
                    ColumnInfo cinfo = new ColumnInfo(xls, sheet);//设置xls文档的指定工作页的列属性
                    cinfo.Collapsed = true;
                    //设置列的范围 如 0列-10列
                    cinfo.ColumnIndexStart = 0;//列开始
                    cinfo.ColumnIndexEnd = 10;//列结束
                    cinfo.Collapsed = true;
                    cinfo.Width = 90 * 60;//列宽度
                    sheet.AddColumnInfo(cinfo);
                    //设置文档列属性结束

                    //设置指定工作页跨行跨列
                    MergeArea ma = new MergeArea(1, 1, 1, dgv.ColumnCount);//从第1行跨到第二行，从第一列跨到第5列
                    sheet.AddMergeArea(ma);
                    //设置指定工作页跨行跨列结束

                    //创建列样式创建列时引用
                    XF cellXF = xls.NewXF();
                    cellXF.VerticalAlignment = VerticalAlignments.Centered;
                    cellXF.HorizontalAlignment = HorizontalAlignments.Centered;
                    cellXF.Font.Height = 24 * 12;
                    cellXF.Font.Bold = true;
                    cellXF.Pattern = 0;//设定单元格填充风格。如果设定为0，则是纯色填充
                    cellXF.PatternBackgroundColor = Colors.Black;//填充的背景底色
                    cellXF.PatternColor = Colors.Black;//设定填充线条的颜色
                    //创建列样式结束

                    //创建列
                    Cells cells = sheet.Cells; //获得指定工作页列集合
                    //列操作基本
                    Cell cell = cells.Add(1, 1, name, cellXF);//添加标题列返回一个列  参数：行 列 名称 样式对象
                    //设置XY居中
                    cell.HorizontalAlignment = HorizontalAlignments.Centered;
                    cell.VerticalAlignment = VerticalAlignments.Centered;
                    //设置字体
                    cell.Font.Bold = true;//设置粗体
                    cell.Font.ColorIndex = 0;//设置颜色码           
                    cell.Font.FontFamily = FontFamilies.Roman;//设置字体 默认为宋体               
                    //创建列结束  

                    //生成字段名称
                    int k = 0;
                    for (int i = 0; i < dgv.ColumnCount; i++)
                    {
                        if (dgv.Columns[i].Visible)  //不导出隐藏的列
                        {
                            Cell title = cells.Add(2, k + 1, dgv.Columns[i].HeaderText);
                            title.HorizontalAlignment = HorizontalAlignments.Centered;
                            title.VerticalAlignment = VerticalAlignments.Centered;
                            k++;
                        }
                    }
                    //填充数据