JSON错误：编译器错误消息：CS1647：表达式太长或太复杂而无法编译

Question

这是我的控制器类：

 public JsonResult FetchGraphDataJSON()
    {
        DataTable dt = FetchFirstDataTable();

        List<GridModel> data = new List<GridModel>();

        if (dt.Rows.Count != 0)
        {
            foreach (DataRow row in dt.Rows)
            {
                GridModel model = new GridModel();

                model.ID = Convert.ToDouble(row["ID"].ToString());
                model.SHORT_NAME = row["SHORT_NAME"].ToString();
                model.CARRIER_NAME = row["CARRIER_NAME"].ToString();

                model.GridSparklineModel = new List<GridSparklineModel>();

                double carrierId = Convert.ToDouble(row["ID"].ToString());

                DataTable dt2 = GetDt2();

                foreach (DataRow item2 in dt2.Select("ID=" + carrierId))
                {
                    model.GridSparklineModel.Add(new GridSparklineModel { YMDH = DateTime.Parse(item2["YMDH"].ToString()), SELL_DURATION = Convert.ToDouble(item2["SELL_DURATION"]) });
                }

                data.Add(model);
            }
        }

        return Json(data, JsonRequestBehavior.AllowGet);
    }

    public DataTable FetchFirstDataTable()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("ID", typeof(double));
        dt.Columns.Add("SHORT_NAME");
        dt.Columns.Add("CARRIER_NAME");

        dt.Rows.Add(1, "A", "Carrier A");
        dt.Rows.Add(2, "B", "Carrier B");
        dt.Rows.Add(3, "C", "Carrier C");
        dt.Rows.Add(4, "D", "Carrier D");
        dt.Rows.Add(5, "E", "Carrier E");
        dt.Rows.Add(6, "F", "Carrier F");
        dt.Rows.Add(7, "G", "Carrier G");
        return dt;
    }

    public DataTable GetDt2()
    {
        DataTable dt = new DataTable();

        dt.Columns.Add("YMDH");
        dt.Columns.Add("ID", typeof(double));
        dt.Columns.Add("SELL_DURATION");

        dt.Rows.Add("2009-03-07 00:00:00.000", 1, 222.999995);
        dt.Rows.Add("2009-03-07 01:00:00.000", 1, 75.816664);
        dt.Rows.Add("2009-03-07 02:00:00.000", 1, 39.349995);
        dt.Rows.Add("2009-03-07 03:00:00.000", 1, 275.91666);
        dt.Rows.Add("2009-03-07 04:00:00.000", 1, 352.666641);
        dt.Rows.Add("2009-03-07 00:00:00.000", 2, 80.783324);
        dt.Rows.Add("2009-03-07 01:00:00.000", 2, 162.049985);
        dt.Rows.Add("2009-03-07 02:00:00.000", 2, 107.199989);
        dt.Rows.Add("2009-03-07 03:00:00.000", 2, 44.849994);
        dt.Rows.Add("2009-03-07 04:00:00.000", 2, 156.516658);
        dt.Rows.Add("2009-03-07 05:00:00.000", 2, 467.583312);
        dt.Rows.Add("2009-03-07 06:00:00.000", 2, 455.199977);

        return dt;
    }

CSHTML

<script>

    $(document).ready(function () {

        var url = '@Url.Action("FetchGraphDataJSON", "Grid")';

        var rawData = null;
        $.ajax({
            // have to use synchronous here, else the function 
            // will return before the data is fetched
            async: false,
            url: url,
            dataType: "json",
            success: function (data) {
                rawData = data;
            }
        });


        var plotData = []

        for (var i = 0; i < rawData.length; i++) {
            //Parse the date.
            document.write(rawData[i] + "<br>");
        }

    });
</script>

运行它时会出现错误：编译器错误消息：CS1647：表达式太长或太复杂而无法编译。知道如何解决这个问题。我使用vs2012与mvc和c＃。