Hi,

VB.Net 2005
Windows XP Pro

Is this legal? It works...something doesn't seem quite right...???

Problem outlined below (at end)

'This is the main application form...main thread
public sub new()

InitializeComponent()

'This is another form I want to run on its own msg pump
dim myForm as new frmSomeForm() 'Initialize Component is called here
myForm.myProperty = 10 'No big deal

Dim t As New Thread(New ParameterizedThreadStart(AddressOf startUIThread))
t.SetApartmentState(ApartmentState.STA)
t.Start(myForm)

end sub


<STAThread()> _
Private Sub startUIThread(ByVal theForm As Object)
Try
Application.Run(CType(theForm, Form))
Catch ex As Exception
log.Error(ex.ToString, ex.InnerException)
End Try
End Sub


My problem (in frmSomeForm):

My log file indicates InvokeRequired is FALSE, but when I access the combo
box on this form, I'm getting a CROSS THREADED EXCEPTION...?

Private Sub mvarDataSupplier_initialized() Handles
mvarDataSupplier.initialized
Try
If (InvokeRequired) Then
log.Debug("InvokeRequired")
Dim d As New mvarDataSupplier_initializedDelegate(AddressOf
mvarDataSupplier_initialized)
Invoke(d, Nothing)
Exit Sub
End If

With Me.cboGroups
.Items.Clear() 'cross threaded exception here
End With

End Sub



--
thanks in advance,
georgejetson

Hi georgejetson

You can protect against this case by also checking the value of
IsHandleCreated when InvokeRequired returns false on a background thread. If
the control handle has not yet been created, you must wait until it has been
created before calling Invoke or BeginInvoke. Typically, this happens only
if a background thread is created in the constructor of the primary form for
the application (as in Application.Run(new MainForm()), before the form has
been shown or Application.Run has been called.

Regards,
John

"georgejetson" <samiam (AT) nospam (DOT) nospam> wrote

Hello georgejetson

I agree with John. Does John's suggestion help you? If you have any
questions or concerns, please feel free to post here.

Regards,
Jialiang Ge
Microsoft Online Community Support

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