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POwhy does Mutex.WaitOne() returns immediately in WPF?
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  1. POwhy does Mutex.WaitOne() returns immediately in WPF?
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    copied!<p>I am trying to implement SigleInstance application per user session. I am using a local mutex for this. I have the following startup code.</p> <pre><code>public partial class App : Application { private const string applicationName = "EDisc.Client.Application"; private const string appGUID = "2AE55EA7-B392-42EF-BDFA-3DAFCE2B4B32"; public App() { bool isUnique = false; using (var mutex = new Mutex(false, appGUID)) //Local mutex is local to the machine,it is per user,If u need a instance per machine,prefix appGUID with global. { try { try { isUnique = mutex.WaitOne(TimeSpan.FromSeconds(3), true); //wait in case first instance is shutting down. if (isUnique) //If this is the first process. { this.Navigated += new NavigatedEventHandler(App_Navigated); this.Exit += new ExitEventHandler(App_Exit); AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException); this.DispatcherUnhandledException += new System.Windows.Threading.DispatcherUnhandledExceptionEventHandler(App_DispatcherUnhandledException); } else //If process is already running. { LoggingHelper.LogMessage(CommonMessages.ANOTHER_APP_INSTANCE_OPEN, Source.EDiscClientApplication); MessageBox.Show(CommonMessages.CLOSE_OTHER_APP_INSTANCE, CommonMessages.ANOTHER_APP_INSTANCE_OPEN, MessageBoxButton.OK, MessageBoxImage.Exclamation); CloseApplicationInstance(); return; } } catch (AbandonedMutexException) { } } finally { if (isUnique) mutex.ReleaseMutex(); } } } } </code></pre> <p>isUnique is always true irrespective of whether it is the first instance or second instance. mutex.waitone() returns immediately without waiting. I have been scratting my head for what can possibly be wrong in this code. Please help</p>
 

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