C# 通过Windows Phone 8中的事件处理程序将数据传递到ui

我使用以下模式将工作线程上运行的HTTP请求的响应数据传递给相关UI

using System;

namespace ConsoleApplication1
{

    class Program
    {
        static void Main(string[] args)
        {
            Counter c = new Counter(new Random().Next(10));
            c.ThresholdReached += c_ThresholdReached;

            Console.WriteLine("press 'a' key to increase total");
            while (Console.ReadKey(true).KeyChar == 'a')
            {
                Console.WriteLine("adding one");
                c.Add(1);
            }
        }

        static void c_ThresholdReached(object sender, ThresholdReachedEventArgs e)
        {
            Console.WriteLine("The threshold of {0} was reached at {1}.", e.Threshold,  e.TimeReached);
            Environment.Exit(0);
        }
    }

    class Counter
    {
        private int threshold;
        private int total;

        public Counter(int passedThreshold)
        {
            threshold = passedThreshold;
        }

        public void Add(int x)
        {
            total += x;
            if (total >= threshold)
            {
                ThresholdReachedEventArgs args = new ThresholdReachedEventArgs();
                args.Threshold = threshold;
                args.TimeReached = DateTime.Now;
                OnThresholdReached(args);
            }
        }

        protected virtual void OnThresholdReached(ThresholdReachedEventArgs e)
        {
            EventHandler<ThresholdReachedEventArgs> handler = ThresholdReached;
            if (handler != null)
            {
                handler(this, e);
            }
        }

        public event EventHandler<ThresholdReachedEventArgs> ThresholdReached;
    }

    public class ThresholdReachedEventArgs : EventArgs
    {
        public int Threshold { get; set; }
        public DateTime TimeReached { get; set; }
    }
}

步骤2：然后在HTTPManager中，在WebClient完成其POST请求后，我执行以下操作：

    private void ButtonSend_Click(object sender, RoutedEventArgs e)
    {
        // Create a worker thread
        worker = new BackgroundWorker();
        worker.DoWork += new DoWorkEventHandler(worker_DoWork);
        worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_DoWorkFinished);
        worker.WorkerSupportsCancellation = true;
        worker.RunWorkerAsync();
    }

    ....


    void worker_DoWork(object sender, DoWorkEventArgs e)
    {

         ApplicationManager.Instance.getHTTPManager().makeHTTPSRequest(url);

    }

            webClient.WriteStreamClosed += (s, args) =>
            {
                if (args.Error != null)
                {
                    status = mStatusFromServer;
                }
                else
                {
                    status = HTTPManager.mDefaultStatus;
                }

                ContactSendCompletedEventArgs args2 = new  ContactSendCompletedEventArgs();
                args2.Status = status;
                Debug.WriteLine("Status: " + args2.Status);
                OnContactSendCompleted(args2);
                //Debug.WriteLine("Status: " + status);
                //Contact_Send_Complete(this, status, i);
            };

        HTTPManager man = ApplicationManager.Instance.getHTTPManager();
        man.ContactSendCompleted += c_Contact_Send_Completed;

    static void c_Contact_Send_Completed(object sender, ContactSendCompletedEventArgs args)
    {
        Debug.WriteLine("The status: ", args.Status);

        ...

    }

我也在这门课上做过事件处理，比如

 namespace MyPhone8App.Common
 {

public delegate void ContactSendCompletedEventHandler(ContactSendCompletedEventArgs e);

class HTTPManager
{

    ...

    protected virtual void OnContactSendCompleted(ContactSendCompletedEventArgs e)
    {
        EventHandler<ContactSendCompletedEventArgs> handler = ContactSendCompleted;
        if (handler != null)
        {
            handler(this, e);
        }
    }

    public event EventHandler<ContactSendCompletedEventArgs> ContactSendCompleted;
}     

public class ContactSendCompletedEventArgs : EventArgs
{
    public String Status { get; set; }
}

---

就这些。有什么想法吗

你应该发布winphone 8应用程序出现问题的代码。很抱歉，现在不可用。但现在我可以更清楚地详述我做了什么。我有一个触发BackgroundWorker的UI页面，我在MyHTTPManager类中使用WebClient执行HTTPS请求。这个类也是我定义EventHandler的地方。在UI页面中，我订阅了以下事件：；ApplicationManager.Instance.getHTTPManager.My_事件+=事件处理程序\u回调\u在\u页面中。在WebClient OpenWriteClosed方法中，我获取响应的状态并将其传递给UI。尽管它进入回调，但没有要传递的数据。希望这有点帮助。定义空数据。参数e为空吗？不，一点也不。请看我的答案