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POBackground Worker thread not ending on cancellation
 

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    <p>I am having a little issue, I finally figured out how to add a background worker to my application now my only problem is it does not end the thread, or atleast not fast enough when I am clicking my cancel button. I must be doing something wrong. I would like for it to abort the thread as soon as the button is clicked. Is this feasable? My thread is by no means extensive. </p> <p>I am going to post some examples of the way I am doing it.</p> <pre><code> Public Sub New() InitializeComponent() bw.WorkerReportsProgress = True bw.WorkerSupportsCancellation = True AddHandler bw.DoWork, AddressOf bw_DoWork ' AddHandler bw.ProgressChanged, AddressOf bw_ProgressChanged AddHandler bw.RunWorkerCompleted, AddressOf bw_RunWorkerCompleted End Sub </code></pre> <p>My DoWork Event</p> <pre><code> Private Sub bw_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs) If bw.CancellationPending = True Then e.Cancel = True WorkEventRunning = False Else CheckForIllegalCrossThreadCalls = False Dim worker As BackgroundWorker = CType(sender, BackgroundWorker) 'my long winded event ' more of my long winded event. End if </code></pre> <p>My Cancel button Code</p> <pre><code> Private Sub ToolStripButton2_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton2.Click 'Stop If bw.WorkerSupportsCancellation = True Then WorkEventRunning = False bw.CancelAsync() bw.Dispose() End If </code></pre> <p>And my WorkCompleted</p> <pre><code> Private Sub bw_RunWorkerCompleted(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs) If e.Cancelled = True Then 'canceled WorkEventRunning = False ElseIf e.Error IsNot Nothing Then MsgBox(e.Error.Message) Else 'done End If End Sub </code></pre>
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    1. CObw.CancellationPending will never be true at the start of DoWork. It only turns on *later*, when you're running the "long winded" code. Note that setting CheckForIllegalCrossThreadCalls to False is a really, Really, REALLY bad idea. Delete that.
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