Thread Question

[ADO DOT NET]

Hi,

I use this to set focus while running my code on a thread:

   Delegate Sub SetFocusCallback()
   Private Sub SetFocus()
       On Error Resume Next
       If Me.ProcessButtonX.InvokeRequired Then
           Dim d As New SetFocusCallback(AddressOf SetFocus)
           Me.Invoke(d)
       Else
           Me.ProcessButtonX.Focus()
       End If
   End Sub

I can do everything I need but I cannot use Me.Close in a thread!

How should I change the above code to close the form inside a thread for me and then finish thread?

[PlausiblyDamp]

When running from a background thread Me would refer to the thread's class rather than the form - you would either need to pass a reference to the form to the thread or invoke the close method similar to how you are invoking a method in your code above.

[ADO DOT NET]

sorry but i could not understand you?

so how can i unload the form in this thread?

 

"If Me.Form_Closing Then" how it should be?

[PlausiblyDamp]

If you need to call the form's close method from a thread then you will need to use Invoke - something similar to

Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs)
   Dim t As New Thread(testThread)
   t.Start()
End Sub
Delegate Sub test()
Private Sub testThread()

   If InvokeRequired Then
       Dim d As New test(Me.Close)
       Invoke(d)
   Else
       Me.Close()
   End If
End Sub

should do it.

 

If you want to handle the closing event in a non-ui thread then that is a different matter - the event will be raised on the UI thread and you would need someway to communicate with your thread.