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POC# Multi Thread Design Example
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  1. POC# Multi Thread Design Example
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    copied!<p>I am relatively new to C#/.Net. I'm developing a desktop application that requires multi threading. I came up with the following pattern below as a base. I was wondering if anyone could point out how to make it better in terms of coding, being thread safe, and being efficient.</p> <p>Hopefully this makes some sense.</p> <hr> <pre><code>public abstract class ThreadManagerBase { // static class variables private static ThreadManagerBase instance = null; private static BackgroundWorker thread = null; private static ProgressBarUIForm progress = null; /// &lt;summary&gt; /// Create a new instance of this class. The internals are left to the derived class to figure out. /// Only one instance of this can run at any time. There should only be the main thread and this thread. /// &lt;/summary&gt; public abstract static ThreadManagerBase NewInstance(); /// &lt;summary&gt; /// Clears the instance. /// &lt;/summary&gt; public static void ClearInstance() { instance = null; } /// &lt;summary&gt; /// Initializes the background worker with some presets. /// Displays progress bar. /// &lt;/summary&gt; private abstract static void InitializeThread() { thread = new BackgroundWorker(); thread.WorkerReportsProgress = true; thread.WorkerSupportsCancellation = true; thread.DoWork += new DoWorkEventHandler(thread_DoWork); thread.RunWorkerCompleted += new RunWorkerCompletedEventHandler(thread_RunWorkerCompleted); thread.ProgressChanged += new ProgressChangedEventHandler(thread_ProgressChanged); thread.RunWorkerAsync(); progress = new ProgressBarUIForm(); progress.EnableCancelButton = true; progress.UserCanceled += new EventHandlerCancelClicked(progress_UserCanceled); progress.ShowDialog(); thread.Dispose(); thread = null; } private static void progress_UserCanceled(bool userCanceled) { thread.CancelAsync(); } private static void thread_ProgressChanged(object sender, ProgressChangedEventArgs e) { progress.SetProgressLevel = e.ProgressPercentage; progress.SetProgressMessage = e.UserState.ToString(); } private static void thread_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { progress.Close(); progress = null; } private static void thread_DoWork(object sender, DoWorkEventArgs e) { ProcessWork(); } private abstract static void ProcessWork() { // do actuall stuff here. // the derived classes will take care of the plumbing. } } </code></pre>
 

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