.net - BackGroundWorker RunWorkerCompleted Event Not Called Sometimes?

Feb 1, 2012

I'm seeing some strange behavior where the RunWorkerCompleted event for one of two threads I start isn't being called depending on how I call them. Check out the code below, and the two methods of firing the threads, good() and bad().

[Code]...

In both cases the DoWork event is called for both threads. But in the bad() case, only the second thread fires the RunWorkerCompleted event. This is obviously due to the two different ways I'm using VB to handle events here. I'm looking for an explanation of this behavior, preferably with a link to some documentation that could help me understand how these events are being handled in VB better. It seems strange to me that just reusing a variable name here seems to either dispose of the thread before it's done or else just make it stop firing events.

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BackGroundWorker Passing Argument In RunWorkerCompleted Event?

Jan 15, 2012

my current solution as you can see is by using shared variable within a class in order to pass a value.

on the form load of my application i called: workerSample.RunWorkerAsync

Dim finalList As List(Of String)
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[Code].....

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Vb.net
Private Sub FirstButtonToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FirstButtonToolStripMenuItem.Click

[code]....

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Apr 10, 2012

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[code]...

This worked fine a year ago, and I moved on to other things. I had to return to this code today, and when I run it now, the OnDoWork override is simply not called. A breakpoint in there isn't hit, debugging messages aren't written, the method is simply not called, and no errors are thrown anywhere. I can't think what would have changed that could cause this, since it seems like a low level framework thing. The rest of the app loads and runs fine, the main window shows (it's a WPF app), and button click events fire. It's just the background thread method that doesn't fire. What could be going on here?

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Imports System
Imports System.Collections
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[Code].....

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Apr 18, 2011

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The Code:

Public Class childForm
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[code]....

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Feb 9, 2012

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[Code]...

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Sep 22, 2010

I have seen others with a similar issue but not quite what I was looking for. In the backgrounderworker class dowork event I create an instance of a new class and call one of it's function. Previously, I had this code in a windows.form.timer tick event and would pass a delegate in as one of the parameters which would allow the function and other functions it calls within the class to call a method on the form to update a datagrid on the GUI. Is there a way to do this within the dowork event? I need this because the function I call from dowork calls other functions and I want each of those functions to log information in the GUI datagrid.

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I am trying to create a background worker that will spawn a dialog, while a long event is occurring. For example, when the main thread in trying to connect connect to a db and update a large amount of records, I would like to have the background worker spawn a dialog that advises the user to "Please Wait"

Here is what I have so far
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[Code] .....

4. When the long activity is completed I call this:
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Oct 12, 2010

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what could be keeping the the Load event from working?

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Case "value2"
Case "value3"

[code].....

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[Code].....

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Nov 16, 2011

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Is there a design pattern that I might use? An easy way to address this with the .net language?

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Imports System.Data.SqlClient

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[CODE]...

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[Code].....

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