Vb.net 无法在MS图表控件中动态更改SerieChartType

我正在使用MS图表控件（3.5.0版）。 我使用设计器（拖放）添加了它。我从Properties->Series->集合中删除了默认的“Series1”，这样图表就不包含任何数据

我在运行时基于一个固定查询向SQLite数据库添加数据。像这样：

Dim SQL As String = "SELECT * FROM ageLength ORDER BY month"
Dim cmd As New SQLiteCommand(SQL)
Dim SqLiteConnection1 As SQLiteConnection = New SQLiteConnection()
SqLiteConnection1.ConnectionString = "Data Source=" & My.Application.Info.DirectoryPath & "\Data\UserData.db3;"
cmd.Connection = SqLiteConnection1
Dim da As New SQLiteDataAdapter(cmd)
Dim ds As New DataSet()
da.Fill(ds, "ageLength")

Dim Series1 As Series = New Series()
Dim Series2 As Series = New Series()
Series1.Name = "Pcnt2nd"
Series1.ChartType = SeriesChartType.Spline
Series2.Name = "Pcnt98th"
Series2.ChartType = SeriesChartType.Spline
Chart1.Series.Add("Pcnt2nd")
Chart1.Series.Add("Pcnt98th")

Chart1.Series("Pcnt2nd").XValueMember = "month"
Chart1.Series("Pcnt2nd").YValueMembers = "Pcnt2nd"
Chart1.Series("Pcnt98th").XValueMember = "month"
Chart1.Series("Pcnt98th").YValueMembers = "Pcnt98th"
Chart1.DataSource = ds.Tables(0)

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数据显示在图表上，但它是条形图。我将其设置为两个系列都使用样条线类型。我不确定我错过了什么。非常感谢您的任何意见。

在做了大量工作之后，我找到了解决方案： 我删除这两行：

Series1.ChartType = SeriesChartType.Spline
Series2.ChartType = SeriesChartType.Spline

Chart1.Series("Pcnt2nd").ChartType = DataVisualization.Charting.SeriesChartType.Line
Chart1.Series("Pcnt98th").ChartType = DataVisualization.Charting.SeriesChartType.Line

然后我加上这两行：

Series1.ChartType = SeriesChartType.Spline
Series2.ChartType = SeriesChartType.Spline

Chart1.Series("Pcnt2nd").ChartType = DataVisualization.Charting.SeriesChartType.Line
Chart1.Series("Pcnt98th").ChartType = DataVisualization.Charting.SeriesChartType.Line

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不知道为什么会这样……但你已经知道了。

在做了大量的胡闹之后，我找到了解决方案： 我删除这两行：

Series1.ChartType = SeriesChartType.Spline
Series2.ChartType = SeriesChartType.Spline

Chart1.Series("Pcnt2nd").ChartType = DataVisualization.Charting.SeriesChartType.Line
Chart1.Series("Pcnt98th").ChartType = DataVisualization.Charting.SeriesChartType.Line

然后我加上这两行：

Series1.ChartType = SeriesChartType.Spline
Series2.ChartType = SeriesChartType.Spline

Chart1.Series("Pcnt2nd").ChartType = DataVisualization.Charting.SeriesChartType.Line
Chart1.Series("Pcnt98th").ChartType = DataVisualization.Charting.SeriesChartType.Line

不知道为什么…但你已经知道了