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VB.NET Threading or Backgroundworker ?? Struggling to get them to work
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Ok,
What you want to do is create a Delegate Sub like this:
Delegate Sub LengthyProcessCallback()
In the beginning of the code for the event handler function add this:
I hope this makes more sense to you in the context of your app.
What you want to do is create a Delegate Sub like this:
Delegate Sub LengthyProcessCallback()
In the beginning of the code for the event handler function add this:
'Test to see if the correct thread is being used. If not, InvokeRequired will be true.
If Me.lblFilename1.InvokeRequired Then
'If InvokeRequired = True then this function will be re-called from the UI Thread.
Dim d As New LengthyProcessCallback(AddressOf ThisFunction)
Me.Invoke(d)
Else
Continue normal processing
End IfI hope this makes more sense to you in the context of your app.
Could yoo expand on that a little more. Sorry, I'm being realy dense with this.
Where doe the Delegate Sub....... need toi go in the code?
And the remainder of the code you have listed, where does that go and what do I need to replace ThisFunction with?
Incidently, my lengthy process is called LoadData and I tried raining the event FinishedDataLoading. But that's as far I got and then I had trouble with
Do you have a simple example?
Thanks for your help.
Andrew
Where doe the Delegate Sub....... need toi go in the code?
And the remainder of the code you have listed, where does that go and what do I need to replace ThisFunction with?
Incidently, my lengthy process is called LoadData and I tried raining the event FinishedDataLoading. But that's as far I got and then I had trouble with
Do you have a simple example?
Thanks for your help.
Andrew
The Delegate Sub can be put anywhere within the Class declaration, but not within another Sub or Function.
The name of the EventHandler Function should replace ThisFunction. In other words,
the name of the function that is being called when the Event is being raised.
The remainder of the code would go into the beginning of the EventHandler function like this:
The name of the EventHandler Function should replace ThisFunction. In other words,
the name of the function that is being called when the Event is being raised.
The remainder of the code would go into the beginning of the EventHandler function like this:
Public Sub EventHandler()
'Test to see if the correct thread is being used. If not, InvokeRequired will be true.
If Me.lblFilename1.InvokeRequired Then
'If InvokeRequired = True then this function will be re-called from the UI Thread.
Dim d As New LengthyProcessCallback(AddressOf ThisFunction)
Me.Invoke(d)
Else
Place your code here from the EventHandler Function
End If
End Sub |
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