具有缺失值的 Visual Basic 样条图

Question

我在 Visual Basic 中创建了一个 winforms 应用程序，其中包含一个 Chart 控件，该控件显示从不同的 CSV 文件中获取的值。 选择文件后，图形如图所示：

我注意到当系列中的值缺失时会创建蓝色垂直线。 我该如何解决？

这是我的代码：

Dim openFileDialog1 As New OpenFileDialog With {
            .Filter = "CSV files (*.csv)|*.csv",
            .FilterIndex = 1,
            .Multiselect = True,
            .Title = "Select only CSV files"
        }

        If openFileDialog1.ShowDialog() = DialogResult.OK Then
            Chart1.Visible = True
            If Chart1.Series.Count > 0 Then
                Chart1.Series.Clear()
            End If

            Dim fileCounter As Integer = 0

            For Each file As String In openFileDialog1.FileNames
                fileCounter += 1
                Dim lineCounter As Integer = 0
                Dim sr As New StreamReader(file)
                Dim currentLine As String

                While sr.Peek() >= 0
                    currentLine = sr.ReadLine()
                    lineCounter += 1

                    If lineCounter = 1 Then
                        Dim series As New Series With {
                            .Name = Path.GetFileNameWithoutExtension(file),
                            .ChartType = SeriesChartType.Spline
                        }
                        Chart1.Series.Add(series)
                    Else
                        Dim values() As String = currentLine.Split(",")
                        Dim timers As String = values(0)
                        Dim speed As Double = Double.Parse(values(1))
                        Chart1.Series(fileCounter - 1).Points.AddXY(timers, speed)
                    End If
                End While
                sr.Close()
            Next

            Chart1.Series(0).ChartType = SeriesChartType.Spline
        End If

Answer 1

该系列中的数字是十进制的，但采用美式风格，即浮点数。 在意大利，我们习惯使用，

我通过使用代码更改文化来修复它：

Threading.Thread.CurrentThread.CurrentCulture = New CultureInfo("us-US")
Threading.Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator = "."