在工作中突然要用到这个就记录下来。

不知为何我这里的StringBuilder[] 数组必须要指明几个(les)才给用,否则就会报错。

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。

    }

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　　　　//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[0].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 = 0; j < ds_JKName.Tables[0].Rows.Count; j++)            {                if (j == 0)                {                    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                                    }                else                {                    sb_bj[j] = new StringBuilder().Append(",{ name: '" + ds_JKName.Tables[0].Rows[j]["监控点名称"] + "',data:[");  //创建Json开头                }                DateTime beginDay = DateTime.MinValue;                for (int i = 0; i < ds_jiankongdianName.Tables[0].Rows.Count; i++)                {                    string b = ds_JKName.Tables[0].Rows[j]["监控点ID"].ToString();                    string c = ds_jiankongdianName.Tables[0].Rows[i]["监控点ID"].ToString();                    if (b.Equals(c))                    {                        beginDay = Convert.ToDateTime(ds_jiankongdianName.Tables[0].Rows[i]["数据时间"]);                        sb_bj[j].Append("[Date.UTC(" + beginDay.Year + ", " + (beginDay.Month - 1) + ", " + beginDay.Day + ", " + beginDay.Hour + ", " + beginDay.Minute + ")," + ds_jiankongdianName.Tables[0].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]);             }