int les = 5;

   StringBuilder[] sb_bj = new StringBuilder[les];   

　　 for (int j = 0; j < ds_JKName.Tables[0].Rows.Count; j++)
　　 {

　　　　　　string a = "{ name: '" + ds_JKName.Tables[0].Rows[j]["监控点名称"] + "',data:[";

　　　　　　sb_bj[j] = new StringBuilder().Append(a); //创建Json开头   注意这里赋值一定要先new StringBuilder() 然后再点.Append(a) 添加值，否则会报错。

}

-------------------------------------------------------------------------------------------

 　　　　//根据监控点ID获取监控点名称（名称）

            DataSet ds_JKName = _bll.GetJianKongDianNameListByKongDianID(ids);

            int les = ds_JKName.Tables[].Rows.Count;

            StringBuilder[] sb_bj = new StringBuilder[les];

            //获取监控名称用于显示折线名称(过程)

            DataSet ds_jiankongdianName = _bll.GetJianKongDianLists(ids, beginDate, endDate, dNum);

            //构建Json格式

            for (int j = ; j < ds_JKName.Tables[].Rows.Count; j++)

            {

                if (j == )

                {

                    string a = "{ name: '" + ds_JKName.Tables[].Rows[j]["监控点名称"] + "',data:[";

                    sb_bj[j] = new StringBuilder().Append(a); //创建Json开头

                }

                else

                {

                    sb_bj[j] = new StringBuilder().Append(",{ name: '" + ds_JKName.Tables[].Rows[j]["监控点名称"] + "',data:[");  //创建Json开头

                }

                DateTime beginDay = DateTime.MinValue;

                for (int i = ; i < ds_jiankongdianName.Tables[].Rows.Count; i++)

                {

                    string b = ds_JKName.Tables[].Rows[j]["监控点ID"].ToString();

                    string c = ds_jiankongdianName.Tables[].Rows[i]["监控点ID"].ToString();

                    if (b.Equals(c))

                    {

                        beginDay = Convert.ToDateTime(ds_jiankongdianName.Tables[].Rows[i]["数据时间"]);

                        sb_bj[j].Append("[Date.UTC(" + beginDay.Year + ", " + (beginDay.Month - ) + ", " + beginDay.Day + ", " + beginDay.Hour + ", " + beginDay.Minute + ")," + ds_jiankongdianName.Tables[].Rows[i]["avgValue"].ToString() + "],");

                    }

                }

                 sb_bj[j].Append("]}");  //创建Json结尾

                 //sb_bj[j].Remove(sb_bj[j].Length -1 ,1);

                 seriesData.Append(sb_bj[j]);

            }