Not able to run Range Selector in flexchart, vb.net4.8

Not able to run Range Selector in flexchart, vb.net4.8

Posted by: christophnoelle on 20 June 2025, 5:24 am EST

• 

  christophnoelle

  • Post Options:
  • Link
    Copy

  Posted 20 June 2025, 5:24 am EST

  Created 2 flexcharts and bound together with:

  [code]Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load

  'Passing data in FlexChart
  Me.FlexChart1.DataSource = _data
  
  'Binding chart's AxisX to 'Date' so dates appear in Horizontal axis
  Me.FlexChart1.BindingX = "dt"
  
  'Binding FlexChart to 'Volume' so their market share appears in Vertical axis
  Dim _sVolume As Series = New Series() With {
       .Name = "Volume",
       .Binding = "Volume",
       .AxisY = New Axis() With {
           .Position = Position.Left,
           .Format = "#,##0,,M"
      }
  }
  Me.FlexChart1.Series.Add(_sVolume)
  
  _rsXRangeSelector = New RangeSelector(FlexChart2)
  
  'Passing data in RangeSelection chart
  FlexChart2.DataSource = Me.FlexChart1.DataSource
  
  'Binding chart's AxisX to 'Date' so dates appear in Horizontal axis
  FlexChart2.BindingX = "dt"
  
  'Adding a new Series for High quote, hence binding it to "High" field 
  FlexChart2.Series.Add(New Series() With {
       .Binding = "istTemp"
  })
  

  End Sub[/code]

  _data is list of DataItem and empty for the first time:

      Private Class DataItem
          Public Property istTemp As Single
          Public Property istHum As Single
          Public Property sollTemp As Single
          Public Property sollHum As Single
          Public Property OnOff As Integer
          Public Property RunPause As Integer
          Public Property dt As DateTime
      End Class

  and generated via timer.ticks.

  After starting the prog, I get System.OverflowException in System.Drawing.dll: Graphics.cs:

  	private void CheckErrorStatus(int status)
  	{
  		switch (status)
  		{
  		case 1:
  		case 7:
  		{
  			int lastWin32Error = Marshal.GetLastWin32Error();
  			if (lastWin32Error == 5 || lastWin32Error == 127 || (((uint)UnsafeNativeMethods.GetSystemMetrics(4096) & (true ? 1u : 0u)) != 0 && lastWin32Error == 0))
  			{
  				return;
  			}
  			break;
  		}
  		case 0:
  			return;
  		}
  		throw SafeNativeMethods.Gdip.StatusException(status);
  	}

  
  
  with a status of** 11.**

  What is missing to work correctly?

  Regards

• 

  uttkarsh.matiyal

  

  • Post Options:
  • Link
    Copy

  Posted 23 June 2025, 3:40 am EST

  Hello,

  The error occurs because there is no data initially. To fix this, you can add a check for

  _data.Count

  and only add the selector when there is data available, like this:

  ...
      'timer
      Timer1.Interval = 500
      AddHandler Timer1.Tick, AddressOf Timer_Tick
      Timer1.Start()
  
      AddHandler FlexChart2.Rendered, AddressOf SetupRangeSelector
  End Sub
  
  Private Sub SetupRangeSelector()
      If _rsXRangeSelector IsNot Nothing OrElse _data.Count = 0 Then
          Return
      End If
      _rsXRangeSelector = New RangeSelector(FlexChart2)
  End Sub
  
  Private Sub Timer_Tick(sender As Object, e As EventArgs)
      _data.Add(New DataItem With {
          .dt = DateTime.Now,
          .Volume = _rnd.Next(20),
          .istTemp = _rnd.Next(40, 100)
      })
  End Sub

  We have updated your code to add RangeSelector as mentioned in https://developer.mescius.com/componentone/docs/win/online-flexchart/range-selector.html

  Please refer to the attached sample for implementation. (see FlexChart_RangeSelector.zip)

  Regards,
  
  Uttkarsh.