http://www.fineui.com/bbs/forum.php?mod=viewthread&tid=2506&page=1

/// <summary>
        /// 选中的行
        /// </summary>
        /// <param name="grid"></param>
        /// <returns></returns>
        protected string HowManyRowsAreSelected(Grid grid)
        {
            StringBuilder sb = new StringBuilder();
            int selectedCount = grid.SelectedRowIndexArray.Length;
            if (selectedCount > 0)
            {
                sb.AppendFormat("共选中了 {0} 行：", selectedCount);
                sb.Append("<table class=\"result\">");

                sb.Append("<tr><th>行号</th>");
                foreach (string datakey in grid.DataKeyNames)
                {
                    sb.AppendFormat("<th>{0}</th>", datakey);
                }
                sb.Append("</tr>");


                for (int i = 0; i < selectedCount; i++)
                {
                    int rowIndex = grid.SelectedRowIndexArray[i];
                    sb.Append("<tr>");

                    sb.AppendFormat("<td>{0}</td>", rowIndex + 1);

                    // 如果是内存分页，所有分页的数据都存在，rowIndex 就是在全部数据中的顺序，而不是当前页的顺序
                    if (grid.AllowPaging && !grid.IsDatabasePaging)
                    {
                        rowIndex = grid.PageIndex * grid.PageSize + rowIndex;
                    }

                    object[] dataKeys = grid.DataKeys[rowIndex];
                    for (int j = 0; j < dataKeys.Length; j++)
                    {
                        sb.AppendFormat("<td>{0}</td>", dataKeys[j]);
                    }

                    sb.Append("</tr>");
                }
                sb.Append("</table>");
            }
            else
            {
                sb.Append("<strong>没有选中任何一行！</strong>");
            }

            return sb.ToString();
        }

FineUI 选中多行获取行ID