Single instance application not starting

I developed a single instance WinForm application using .net 4.5 and a mutex on the Main class. Some user report that they can't start the application because the mutex is already taken.

    static string guid = ((GuidAttribute)Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(GuidAttribute), true)[0]).Value + "-OrientalWave";
    public static string GUID { get { return guid; } }

    [STAThread]
    static void Main(string[] args)
    {
        AppDomain currentDomain = AppDomain.CurrentDomain;
        currentDomain.UnhandledException += new UnhandledExceptionEventHandler(UnhandledExceptionHandler);

        // Single Instance Check
        bool createdNew;
        using (var mutex = new Mutex(true, guid, out createdNew))
        {
            if (createdNew)
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                if (args.Length > 0)
                {
                    string filename = args[0];
                    Application.Run(new frmMain(filename));
                }
                else
                    Application.Run(new frmMain());
            }
            else
            {
                if (args.Length > 0)
                {
                    // If i want to open a file
                    string filename = args[0];

                    NamedPipesClient pipeClient = new NamedPipesClient();
                    pipeClient.Start();
                    pipeClient.SendMessage(filename);
                    pipeClient.Stop();
                }
                else
                    MessageBox.Show("Only single instance allowed", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }

    static void UnhandledExceptionHandler(object sender, UnhandledExceptionEventArgs args)
    {
        try
        {
            var exception = (Exception)args.ExceptionObject;
            MessageBox.Show(exception.Message, null, MessageBoxButtons.OK, MessageBoxIcon.Error);
            Logger.Write(Logger.LogType.Error, exception.Source, "Message: " + exception.Message + " - Stack: " + exception.StackTrace);
        }
        catch { }
        Environment.Exit(0);
    }

I searched the web for a solution or an alternative way to create a single instance application but with no success.

---

It can happen if there is any abandoned mutex. You should catch AbandonedMutexException and release the mutex by calling ReleaseMutex(); Then you should be able to acquire a mutex.

You can find a similar use case here http://gonetdotnet.blogspot.in/2017/08/solved-how-to-handle-log4net.html

链接地址: http://www.djcxy.com/p/51176.html

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