Question

我需要我的WPF exe一旦启动就开始监视队列，然后在消息进入时响应。

我现在的方式是：

public partial class App
    {

        readonly BackgroundWorker _worker = new BackgroundWorker();
        protected override void OnStartup(StartupEventArgs e)
        {
            _worker.DoWork += worker_DoWork;
            _worker.RunWorkerCompleted += worker_RunWorkerCompleted;
            _worker.RunWorkerAsync();

        }

        void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            _worker.DoWork += worker_DoWork;
            _worker.RunWorkerAsync();
        }

        static void worker_DoWork(object sender, DoWorkEventArgs e)
        {
           //do work
        }

显然，这是非常可怜的IMO。

另外，我不喜欢在线程中使用while(true)的方法来保持它无限期地运行..

Answer 1

从队列中读取消息不是永久性的，而是定期读取的常见的方法是使用计时器。例如，System.Threading.Timer。

public partial class App : Application
{
    private System.Threading.Timer _msmqReadTimer;

    public App()
    {
        _msmqReadTimer = new System.Threading.Timer(MsmqReadTimerTick);
        _msmqReadTimer.Change(0, 1000); // call MsmqReadTimerTick immediatelly and each 1000 ms
    }

    private void MsmqReadTimerTick(object state)
    {
        // do work

        // if you want to update some UI components after work, you should post this to UI thread dispatcher:
        this.Dispatcher.Invoke(()=> 
        {
            // logic for updating UI should be here
        }, 
        System.Windows.Threading.DispatcherPriority.Background);
    }
}

在WPF中连续监视MSMQ队列的最佳方法

1 个答案: