1

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Web;

namespace BookSystem.Common
{
    public class WebHelper
    {
        public static string Dataset2Json(DataSet ds, int total = -1) //total表示DataSet裡dataTable的資料總條數
        {
            StringBuilder json = new StringBuilder();

            foreach (DataTable dt in ds.Tables)
            {
                //{"total":5,"rows":[   
                json.Append("{\"total\":");
                if (total == -1)
                {
                    json.Append(dt.Rows.Count);
                }
                else
                {
                    json.Append(total);
                }
                json.Append(",\"rows\":[");
                json.Append(DataTable2Json(dt));
                //json.Append(","attr1":"Large"")
                json.Append("]}");
            } return json.ToString();
        }
        public static string DataTable2Json(DataTable dt)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            //jsonBuilder.Append("{\"total\":");
            //jsonBuilder.Append("10,\"rows\":[");
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                //jsonBuilder.Append("{"total":5,"rows":[");
                jsonBuilder.Append("{");
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    jsonBuilder.Append("\"");
                    jsonBuilder.Append(dt.Columns[j].ColumnName);
                    jsonBuilder.Append("\":\"");
                    jsonBuilder.Append(dt.Rows[i][j].ToString());
                    jsonBuilder.Append("\",");
                }
                if (dt.Columns.Count > 0)
                {
                    jsonBuilder.Append("\"fafangFS");
                    jsonBuilder.Append("\":\"");
                    jsonBuilder.Append("1\",");
                    jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
                }
                jsonBuilder.Append("},");
            }
            if (dt.Rows.Count > 0)
            {
                jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
            }
            //jsonBuilder.Append("]}");
            return jsonBuilder.ToString();
        }
    }
}