ASP.NET Stackedbar 图表标记

Question

我正在尝试以编程方式在堆叠条形图上添加标记，但它们似乎没有出现。实际上，我需要在数据点的平均值上显示一个标记，但现在，我什至无法在图表上显示一个简单的标记。

我做错了什么？

代码：

暗图表作为新图表 chart.ID = DtDistinct.Rows(I)("CourseSisID")

                Dim chartareas As New ChartArea
                chart.ChartAreas.Add(chartareas)

                chart.Series.Clear()

                chart.DataBindCrossTable(DtRecords.DefaultView, "Outcomescore", "ShortName", "RecordsPerGroup", "")

                chart.ChartAreas(0).AxisY.Interval = 1
                chart.ChartAreas(0).AxisY.Enabled = AxisEnabled.False


                chart.Palette = ChartColorPalette.None
                chart.PaletteCustomColors = New Color() {ColorTranslator.FromHtml("#DF5B59"), ColorTranslator.FromHtml("#E0D773 "), ColorTranslator.FromHtml("#8AAC53"), ColorTranslator.FromHtml("#6A843F")}
                chart.ChartAreas(0).AxisX.MajorGrid.Enabled = False
                chart.ChartAreas(0).AxisY.MajorGrid.Enabled = False




                For Each cs As Series In chart.Series
                    cs.ChartType = SeriesChartType.StackedBar

                    cs.Points().FindMaxByValue.MarkerColor = Color.AliceBlue
                    cs.Points().FindMaxByValue.MarkerSize = 13
                    cs.Points().FindMaxByValue.MarkerStyle = MarkerStyle.Diamond


                Next


                pnlcharts.Controls.Add(chart)

这是我正在尝试做的事情的图像。我知道上面的代码不会给我下面的图像，但是在我意识到标记不能出现在条形图上之前，我试图找到上面代码的解决方法。

我想在条形图上看到那条条纹线。条纹线应出现在点的计算平均值上。

因此，我可以做的另一种方法是使用注释，因为堆叠条形图不支持标记。我编写了以下代码来添加注释行，但它仍然没有给我我需要的输出，只是因为我不知道如何为图表上的每个 Y 值执行此操作。

这是我的代码：

暗图表作为新图表 chart.ID = DtDistinct.Rows(I)("CourseSisID")

Dim chartareas 作为新 ChartArea chart.ChartAreas.Add(chartareas)

chart.DataBindCrossTable(DtRecords.DefaultView, "OutcomeScore", "ShortName", "RecordsPerGroup", "Label=RecordsPerGroup")

                chart.Palette = ChartColorPalette.None
                chart.PaletteCustomColors = New Color() {ColorTranslator.FromHtml("#DF5B59"), ColorTranslator.FromHtml("#E0D773 "), ColorTranslator.FromHtml("#8AAC53"), ColorTranslator.FromHtml("#6A843F")}

                chart.ChartAreas(0).AxisX.MajorGrid.Enabled = False
                chart.ChartAreas(0).AxisY.MajorGrid.Enabled = False



                Dim charttitle As New Title
                charttitle.Text = DtDistinct.Rows(I)("CourseSisID")
                chart.Titles.Add(charttitle)

                For Each cs As Series In chart.Series
                    cs.ChartType = SeriesChartType.StackedBar
                Next


                Dim ann1 As New VerticalLineAnnotation()
                ann1.AxisX = chart.ChartAreas(0).AxisX
                ann1.AxisY = chart.ChartAreas(0).AxisY
                ann1.IsSizeAlwaysRelative = False
               ann1.X = chart.DataManipulator.Statistics.Mean(chart.Series(0).Name)


                ann1.IsInfinitive = True
                ann1.ClipToChartArea = chart.ChartAreas(0).Name
                ann1.LineColor = Color.Coral
                ann1.LineWidth = 3


                ann1.AnchorX = 1
                ann1.AnchorY = 5

                chart.Annotations.Add(ann1)                

                ann1.LineDashStyle = ChartDashStyle.Dash

                pnlcharts.Controls.Add(chart)

这是我通过上面的代码得到的：

这就是我需要的：注意带状线在每个条形中的值是如何不同的。

Answer 1

                    Dim annotation2 As New LineAnnotation()
                    annotation2.IsSizeAlwaysRelative = False
                    annotation2.AxisX = chart.ChartAreas(0).AxisX
                    annotation2.AxisY = chart.ChartAreas(0).AxisY

                    annotation2.Height = 1
                    annotation2.Width = 0
                    annotation2.LineWidth = 1.5
                    annotation2.StartCap = LineAnchorCapStyle.None
                    annotation2.EndCap = LineAnchorCapStyle.None
                    annotation2.AnchorX = AvgVar
                    annotation2.ToolTip = "Average=" & AvgVar

                    Select Case row
                        Case 1
                            annotation2.AnchorY = 4.5
                        Case 2
                            annotation2.AnchorY = 3.5
                        Case 3
                            annotation2.AnchorY = 2.5
                        Case 4
                            annotation2.AnchorY = 1.5
                        Case 5
                            annotation2.AnchorY = 0.5
                    End Select


                    ' <- your point
                    annotation2.LineColor = Color.Gray
                    annotation2.LineDashStyle = ChartDashStyle.Dash

                    ' <- your color
                    chart.Annotations.Add(annotation2)