string newshopname = "淘宝" + itemname.Text;                        string str_f = "account_name='" + newshopname + "'";                        DataTable dt2 = dt.Select(str_f).CopyToDataTable();                        dt2.Columns.Remove("account_name");                        DevExpress.XtraCharts.Web.WebChartControl WCC = new DevExpress.XtraCharts.Web.WebChartControl();                        var query = from q in dt2.AsEnumerable()                                    group q by q.Field
     
      ("IsReturns") into r                                    select new                                    {                                        _isreturn = r.Key,                                        _count = r.Count()                                    };改成string newshopname = "淘宝" + itemname.Text;                        string str_f = "account_name='" + newshopname + "'";                        DataTable dt2 = dt.Select(str_f).CopyToDataTable();                        dt2.Columns.Remove("account_name");                        DevExpress.XtraCharts.Web.WebChartControl WCC = new DevExpress.XtraCharts.Web.WebChartControl();                        var query = from q in dt2.AsEnumerable()                                    group q by q["IsReturns"] into r                                    select new                                    {                                        _isreturn = r.Key,                                        _count = r.Count()                                    };