Good morning all,
I've come to a problem on a vb.net wpf code that i didn't developed and that I'm not very comfortable with the language.
Basically, i have a PLC-PC communication and i want to update the values on the form on a periodic way.
For that i have a main page, inside that main page i have a Frame, and when change pages i load the new page to the frame, maintaining the main page always running throw-out the program:
When i press the button described on top ( i have 5 of this buttons/pages that the user can freely navigate through ), the page when loaded runs the following code:
Every time i load a new page into the frame i run the previous code, so that i can upload the values present on the screen in "real-time".
Problem:
- The program overtime is getting slower and slower.
- Most of the times that i change page i get a thread error
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I can't know when the thread has finished, because i only want the thread to finish when the page is unloaded.
I've read about Background workers, but I'm not sure that is the correct path.
All help would be appreciated.
Thank you in advance for your time.
I've come to a problem on a vb.net wpf code that i didn't developed and that I'm not very comfortable with the language.
Basically, i have a PLC-PC communication and i want to update the values on the form on a periodic way.
For that i have a main page, inside that main page i have a Frame, and when change pages i load the new page to the frame, maintaining the main page always running throw-out the program:
Code:
Private Sub buttonIOState_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles buttonIOState.Click
SetCursorPos(0, 0)
Frame1.Content = New IOState
End SubCode:
Private Sub Page_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
updateUIThread.IsBackground = True
updateUIThread.Start()
running = True
End Sub
Delegate Sub updateUIDelegate()
Public updateUI2 As updateUIDelegate = AddressOf updateUIfunc
Private Sub updateUIfunc()
textBlockReadPressureT1.Text = intVariables("readingPressureCaixao1").reading
textBlockReadPressureT2.Text = intVariables("readingPressureCaixao2").reading
textBlockReadX1.Text = Format(intVariables("readingX1").reading / 10, "0.0")
textBlockReadX2.Text = Format(intVariables("readingX2").reading / 10, "0.0")
textBlockReadX3.Text = Format(intVariables("readingX3").reading / 10, "0.0")
textBlockReadX4.Text = Format(intVariables("readingX4").reading / 10, "0.0")
End Sub
Private Sub updateUI()
While running
Try
Me.Dispatcher.Invoke(updateUI2)
Thread.Sleep(200)
Catch ex As Exception
MessageBox.Show("Error thread Manual updateUI:" & vbCrLf & ex.ToString)
Exit While
End Try
End While
End Sub
Private Sub Page_Unloaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Unloaded
running = False
Try
System.Threading.Thread.Sleep(50)
updateUIThread.Abort()
Catch ex As Exception
MessageBox.Show("Manual State 2:" & vbCrLf & ex.ToString)
End Try
End SubProblem:
- The program overtime is getting slower and slower.
- Most of the times that i change page i get a thread error
I can't know when the thread has finished, because i only want the thread to finish when the page is unloaded.
I've read about Background workers, but I'm not sure that is the correct path.
All help would be appreciated.
Thank you in advance for your time.