WPF Update lines - wpf

Question

I'm trying to replicate in wpf(vb.net) an app that I made some times ago in winform.
Il the old app I basically open a binary file and load it in one array and then draw a 2d lines chart with it. Files are like 2/4MB size, so i put a slider and every time I change it I call the drawing sub with the slider offset.
Now I'm totaly new in wpf, I figure out how to draw the chart, but I don't understand how update it when I move the slider, or(next step) when I change array's values by code.
To make simple tests I load a file when start and when button1 clicked I modify array values and I would see the update chart, but I have not found a way.
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:testwpf2d"
mc:Ignorable="d"
Title="MainWindow" Height="1920" Width="1080">
<Grid x:Name="BaseGrid">
<Canvas Name="paintSurface" >
<Canvas.Background>
<SolidColorBrush Color="Black" Opacity="1"/>
</Canvas.Background>
<Button Content="Button" Canvas.Left="184" Canvas.Top="36" Width="75" Click="Button_Click"/>
</Canvas>
</Grid>
</Window>
Private Sub BaseGrid_Loaded(sender As Object, e As RoutedEventArgs) Handles BaseGrid.Loaded
Dim openFileDialogORI As OpenFileDialog = New OpenFileDialog()
If openFileDialogORI.ShowDialog = True Then
Try
Dim MyFileORIStream As FileStream = New FileStream(openFileDialogORI.FileName, FileMode.Open, FileAccess.Read)
Dim ORIBuffer As BinaryReader = New BinaryReader(MyFileORIStream)
Dim fInfo As New FileInfo(openFileDialogORI.FileName)
Dim numBytes As Long = fInfo.Length
MyORIArray = ORIBuffer.ReadBytes(CInt(numBytes))
ORIBuffer.Close()
MyFileORIStream.Close()
Dim NomeFileOri As String = openFileDialogORI.FileName
Dim info As New FileInfo(openFileDialogORI.FileName)
Dim length As Integer = CInt(info.Length)
Catch ex As Exception
MsgBox(ex.Message)
End Try
End If
MessageBox.Show("File loaded")
For i As Integer = 1 To 2000
Dim Line As New Line
Line.X1 = i
Line.X2 = i + 1
Line.Y1 = MyORIArray(i)
Line.Y2 = MyORIArray(i + 1)
Line.Stroke = Brushes.YellowGreen
Line.StrokeThickness = 0.25
BaseGrid.Children.Add(Line)
Next
End Sub
Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
Dim Rand As New Random
For i As Integer = 1 To 1000
MyORIArray(i) = Rand.NextDouble * 50
Next
MessageBox.Show("new data ")
BaseGrid.UpdateLayout()
paintSurface.UpdateLayout()
End Sub

Answer 1

I solved creating a collection of point from the array and draw a polyline, when arraypoint change(always by user interaction that raise an event(button,mouse etc), I update or recreate point collection and then use update.layout. I understand that is not the best way but for this little application work good