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854962
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2009-05-12T21:31:40
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2009-05-12T21:36:42.910
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text
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The best way to deal with these generic problems is to deal it once. Here I'm posting a small class that wraps the backgroupdworker thread and makes sure that the workcompleted always gets executed on the UI thread. <hr> <pre> using System.Windows.Forms; namespace UI.Windows.Forms.Utilities.DataManagment { public class DataLoader { private BackgroundWorker _worker; private DoWorkEventHandler _workDelegate; private RunWorkerCompletedEventHandler _workCompleted; private ExceptionHandlerDelegate _exceptionHandler; public static readonly Control ControlInvoker = new Control(); <pre><code> public DoWorkEventHandler WorkDelegate { get { return _workDelegate; } set { _workDelegate = value; } } public RunWorkerCompletedEventHandler WorkCompleted { get { return _workCompleted; } set { _workCompleted = value; } } public ExceptionHandlerDelegate ExceptionHandler { get { return _exceptionHandler; } set { _exceptionHandler = value; } } public void Execute() { if (WorkDelegate == null) { throw new Exception( "WorkDelegage is not assinged any method to execute. Use WorkDelegate Property to assing the method to execute"); } if (WorkCompleted == null) { throw new Exception( "WorkCompleted is not assinged any method to execute. Use WorkCompleted Property to assing the method to execute"); } SetupWorkerThread(); _worker.RunWorkerAsync(); } private void SetupWorkerThread() { _worker = new BackgroundWorker(); _worker.WorkerSupportsCancellation = true; _worker.DoWork += WorkDelegate; _worker.RunWorkerCompleted += worker_RunWorkerCompleted; } void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if(e.Error !=null && ExceptionHandler != null) { ExceptionHandler(e.Error); return; } ControlInvoker.Invoke(WorkCompleted, this, e); } } </code></pre> } <code> And here is the usage. One thing to note is that it exposes a static property ControlInvoker that needs to be set only once (you should do it at the beginning of the app load) Let's take the same example that I posted in question and re write it DataLoader loader = new DataLoader(); loader.ControlInvoker.Parent = this; // needed to be set only once private void StartButton_Click(object sender, EventArgs e) { <pre><code>Thread thread1 = new Thread(new ThreadStart(PerformWorkerTask)); _worker = new BackgroundWorker(); thread1.Start(); </code></pre> } public void PerformWorkerTask() { loader.WorkDelegate = delegate { // get any data you want for (int i = 0; i < 10; i++) { Thread.Sleep(100); } }; loader.WorkCompleted = delegate { // access any control you want MessageLabel.Text = "Completed"; }; loader.Execute(); </code></pre> } Cheers
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1. USSheraz
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