Single Instance Startup Controller for Windows Forms Applications

StartupController

//<sumary>
//Sample Usage of the StartupController class
//</sumary>
static class Program
{
    [STAThread]
    static void Main()
    {
        StartupController startupController = new StartupController();
        startupController.RunOnce<MainForm>();
    }
}

internal class StartupController
{
    private Mutex _globalMutex;

    public void RunOnce<T>() where T : Form
    {
        InitializeMutex();

        bool isNotAlreadyRunning = CanObtainMutexHandle();

        if (isNotAlreadyRunning)
        {
            Run<T>();
        }
        else
        {
            Environment.Exit(0);
        }
    }

    public void Run<T>() where T : Form
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(Activator.CreateInstance<T>());
    }

    private void InitializeMutex()
    {
        MutexSecurity accessControl = new MutexSecurity();
        SecurityIdentifier securityIdentifier = new SecurityIdentifier(WellKnownSidType.WorldSid, null);
        MutexAccessRule accessRule = new MutexAccessRule(securityIdentifier, MutexRights.FullControl, AccessControlType.Allow);
        accessControl.AddAccessRule(accessRule);

        _globalMutex = new Mutex(false, ResolveMutexIdentifier());
        _globalMutex.SetAccessControl(accessControl);
    }

    private bool CanObtainMutexHandle()
    {
        try
        {
            return _globalMutex.WaitOne(TimeSpan.Zero, false);
        }
        catch (AbandonedMutexException)
        {
            return true;
        }
    }

    private static string ResolveGuid()
    {
        var assemblyAttributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(GuidAttribute), false);
        var guidAttribute = assemblyAttributes.GetValue(0) as GuidAttribute;

        if (guidAttribute == null)
            throw new InvalidOperationException("Failed to resolve GUID");

        return guidAttribute.Value;
    }
    
    private static string ResolveMutexIdentifier()
    {
        return string.Format("Global\\{{{0}}}", ResolveGuid());
    }
}