public static string ExportTable(ArrayList data, ArrayList columns){ArrayList columnsBottom = getColumnsBottom(columns);ArrayList columnsTable = getColumnsTable(columns);StringBuilder sb = new StringBuilder();//data = ds.DataSetName + "\n";//data += tb.TableName + "\n";sb.AppendLine("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=gb2312\">");sb.AppendLine("<table cellspacing=\"0\" cellpadding=\"5\" rules=\"all\" border=\"1\">");//写出列名for (int i = 0; i < columnsTable.Count; i++){ArrayList columnsRow = (ArrayList)columnsTable[i];sb.AppendLine("<tr style=\"font-weight: bold; white-space: nowrap;\">");foreach (Hashtable column in columnsRow){sb.AppendLine("<td colspan=" + column["colspan"] + " rowspan=" + column["rowspan"] + ">" + column["header"] + "</td>");}sb.AppendLine("</tr>");}//写出数据int count = 0;foreach (Hashtable row in data){sb.Append("<tr>");foreach (Hashtable column in columnsBottom){Object value;if (column["field"] != null){value = row[column["field"]];}else{value = "";}if (Convert.ToString(column["type"]) == "indexcolumn") value = count + 1;sb.AppendLine("<td >" + value + "</td>");}sb.AppendLine("</tr>");count++;}sb.AppendLine("</table>");return sb.ToString();}public static ArrayList getColumnsBottom(ArrayList columns){ArrayList columnsBottom = new ArrayList();for (int i = 0; i < columns.Count; i++){Hashtable column = (Hashtable)columns[i];if (column["columns"] != null){ArrayList childColumns = (ArrayList)column["columns"];columnsBottom.AddRange(getColumnsBottom(childColumns));}else{columnsBottom.Add(column);}}return columnsBottom;}public static ArrayList getColumnsTable(ArrayList columns){ArrayList table = new ArrayList();getColumnsRows(columns, 0, table);createTableSpan(table);return table;}public static void getColumnsRows(ArrayList columns, int level, ArrayList table){ArrayList row = null;if (table.Count > level){row = (ArrayList)table[level];}else{row = new ArrayList();table.Add(row);}for (int i = 0; i < columns.Count; i++){Hashtable column = (Hashtable)columns[i];ArrayList childColumns = (ArrayList)column["columns"];row.Add(column);if (childColumns != null){getColumnsRows(childColumns, level + 1, table);}}}public static void createTableSpan(ArrayList table){for (int i = 0; i < table.Count; i++){ArrayList row = (ArrayList)table[i];  //rowfor (int l = 0; l < row.Count; l++){Hashtable cell = (Hashtable)row[l];   //columnint colSpan = getColSpan(cell);cell["colspan"] = colSpan;if (colSpan > 1){cell["rowspan"] = 1;}else{cell["rowspan"] = table.Count - i;}}}}public static int getColSpan(Hashtable column){int colSpan = 0;ArrayList childColumns = (ArrayList)column["columns"];if (childColumns != null){for (int i = 0; i < childColumns.Count; i++){Hashtable child = (Hashtable)childColumns[i];colSpan += getColSpan(child);}}else{colSpan = 1;}return colSpan;}