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POC# Backround Worker In Different Namespace/Class WPF
 

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  1. POC# Backround Worker In Different Namespace/Class WPF
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    <p><strong>EDIT: Solved by adding missing progress changed event handler.</strong></p> <p>I'm porting a WPF VB.net application to C# and am having an issue with a background worker that has a DoWork method in a different class. I have a suspicion that I am not casting the background worker correctly or I may need a handler?</p> <p>The vb sample code works fine and the progress bar indicates properly, the C# code seems like it fires the bw.RunWorkerAsync(); method as it reports as IsBusy=True but there is no other response, progress or calls to the external class (as far as I can tell).</p> <p>This is a WPF application and the issue is regarding a Usercontrol trying to report progress from a public class outside of the control.</p> <p>If someone could point me in the right direction I would really appreciate it.</p> <p>The C# sample code</p> <pre><code> namespace testApp.Usercontrols public partial class ucHome : UserControl { public Sharing.clsDownloadCollection foo = new Sharing.clsDownloadCollection(); BackgroundWorker bw = new BackgroundWorker(); public ucHome() { InitializeComponent(); } private void Button1_Click(object sender, RoutedEventArgs e) { bw.WorkerReportsProgress = true; pBar.Maximum = 50000; //progress bar on ucHome pBar.Value = 0; **// Indicates IsBusy=True when debugging but can't see any further activity bw.RunWorkerAsync(); //** } public void bw_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e) { BackgroundWorker worker = sender as BackgroundWorker; var foo=new foo(); // possible problem? foo.DoWork((BackgroundWorker)sender); } public void bw_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e) { this.pBar.Value = e.ProgressPercentage; } </code></pre> <p>The external class different project folder/namespace</p> <pre><code> namespace testApp.Sharing { //different namespace /folder than ucHome public class foo { public void DoWork(BackgroundWorker bw) { for (int i = 0; i &lt;= 50000; i++) { i += 1; bw.ReportProgress(i - 1); } } } </code></pre> <p>The sample VB code that works as expected.</p> <pre><code> Public Class ucHome 'user control Public foo As New foo Friend WithEvents bw As New BackgroundWorker Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click bw.WorkerReportsProgress = True pBar.Maximum = 50000 pBar.Value = 0 bw.RunWorkerAsync() End Sub Private Sub bw_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bw.DoWork 'possible my C# is not casting correctly? foo.DoWork(DirectCast(sender, BackgroundWorker)) End Sub Private Sub bw_ProgressChanged(ByVal sender As Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles bw.ProgressChanged Me.pBar.Value = e.ProgressPercentage End Sub End Class </code></pre> <p>the class foo that user control calls</p> <pre><code>Public Class foo Public Sub DoWork(ByVal bw As BackgroundWorker) For i As Integer = 0 To 50000 i += 1 bw.ReportProgress(i - 1) Next End Sub End Class </code></pre>
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    1. USDaveCS
    1. USDaveCS
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      1. VTDownMod
    1. COcode doesn't compile as provided. eg where is "myfoo" defined? have you confused the local "foo" with a "myfoo" field which is causing your problem? Also, why cast sender twice (and why store it in a variable and never use it. Try cleaning up the code so others don't have to wade through chaff like that
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      1. USPeter Ritchie
    2. COApologize for my typo (myfoo not intended to be in the post). I have solved it, was missing an event handler for progress changed.
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      1. USDaveCS
 

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