DevExpress.chartControt画趋势图

  private void DrawLine(DataTable dt)
         {
             Myalysis.Series.Clear();
             //图标位置
             Myalysis.Legend.AlignmentHorizontal = LegendAlignmentHorizontal.Right;
             Myalysis.Legend.AlignmentVertical = LegendAlignmentVertical.Top;
             ChartTitle chartTitle = new ChartTitle();
             chartTitle.TextColor = System.Drawing.Color.Black;//字体颜色
             chartTitle.Font = new Font("Tahoma", );//字体类型字号
             chartTitle.Dock = ChartTitleDockStyle.Bottom;//标题对齐方式
             chartTitle.Alignment = StringAlignment.Far;
             Myalysis.Titles.Clear();//清理标题
             Series s_Series = new Series("血糖总览", ViewType.Line);
             s_Series.ArgumentScaleType = ScaleType.Qualitative;//x轴类型
             s_Series.ValueScaleType = ScaleType.Numerical;//y轴类型
             s_Series.PointOptions.PointView = PointView.Values;//显示表示的信息和数据
             //X轴的数据字段
             s_Series.ArgumentDataMember = "reporttime";
             //Y轴的数据字段
             s_Series.ValueDataMembers[] = "RESULT";
             //定义线条上点的标识形状是否需要
             ((LineSeriesView)s_Series.View).LineMarkerOptions.Visible = true;
             //定义线条上点的标识形状
             ((LineSeriesView)s_Series.View).LineMarkerOptions.Kind = MarkerKind.Circle;
             //定义线条上点的标识颜色
             s_Series.View.Color = ColorTranslator.FromHtml("#f90");
             //不显示X、Y轴上面的交点的值
             ((PointSeriesLabel)s_Series.Label).Visible = true;
             //线条的类型，虚线，实线
             ((LineSeriesView)s_Series.View).LineStyle.DashStyle = DashStyle.Solid;
             s_Series.DataSource = dt;
             Myalysis.Series.Add(s_Series);
             foreach (DataRow item in dt.Rows)
             {
                 if (item["diagcode"].ToString() == "".ToString())
                 {
                     Series ss_series = new Series("", ViewType.Line);
                     ss_series.View.Color = Color.Blue;
                     ((LineSeriesView)ss_series.View).LineMarkerOptions.Kind = MarkerKind.Circle;
                     //X轴的数据字段
                     s_Series.ArgumentDataMember = "reporttime";
                     //Y轴的数据字段
                     s_Series.ValueDataMembers[] = "RESULT";

                     ss_series.Points.Add(new SeriesPoint(item["reporttime"], item["result"].ToString()));
                     Myalysis.Series.Add(ss_series);
                 }
             }
             //增加水平警戒线
             ConstantLine constantLine1 = new ConstantLine();
             ConstantLine constantLine2 = new ConstantLine();
             constantLine2.AxisValue = 3.9;
             constantLine1.AxisValue = ;
             constantLine2.LegendText = "正常下限(3.9)";
             constantLine1.LegendText = "正常上限(10.0)";
             constantLine1.Title.TextColor = Color.Red;
             constantLine1.Color = Color.Red;
             constantLine2.Color = Color.Green;
             constantLine1.LineStyle.DashStyle = DashStyle.Solid;
             constantLine2.LineStyle.DashStyle = DashStyle.Solid;
             XYDiagram labDiagram = (XYDiagram)Myalysis.Diagram;
　　　　　　　　　//去掉曲线图中的线条
             labDiagram.AxisY.GridLines.Visible = false;             labDiagram.AxisY.ConstantLines.Clear();
             labDiagram.AxisY.ConstantLines.Add(constantLine1);
             labDiagram.AxisY.ConstantLines.Add(constantLine2);

         }