photoChooserTask导致SocketException

Question

我想像这样用PhotoChooserTask返回一张照片：

 private void getimage_Click(object sender, EventArgs e)
     {
         photoChooserTask = new PhotoChooserTask();
         photoChooserTask.Completed += new EventHandler<PhotoResult>(photoChooserTask_Completed);

         try
         {
             photoChooserTask.Show();
         }
         catch (System.InvalidOperationException ex)
         {
             MessageBox.Show("An error occurred.");
         }

     }
     void photoChooserTask_Completed(object sender, PhotoResult ee)
     {
         if (ee.TaskResult == TaskResult.OK)
         {

             BitmapImage bmp = new BitmapImage();
             bmp.SetSource(ee.ChosenPhoto);

             if (ee.TaskResult == TaskResult.OK && ee.Error == null)
             {

                     WriteableBitmap wb = new WriteableBitmap(bmp);

                     notes.Add(new chatinfo() { sendimage = bmp });
                     noteListBox.ItemsSource = null;
                     noteListBox.ItemsSource = notes;
             }
           }

       }

但每次程序到达这里时：“bmp.SetSource(ee.ChosenPhoto)；”将调用一个SocketException。

private void OnRecieveFrom()
     {
         var receiveArgs = new SocketAsyncEventArgs();
         receiveArgs.RemoteEndPoint = this.IPEndPoint;
         receiveArgs.SetBuffer(new Byte[MAX_BUFFER_SIZE], 0, MAX_BUFFER_SIZE);
         var strBdr = new StringBuilder();
         receiveArgs.Completed += (__, result) =>
         {

             string message = CreateMessage(result);

                Deployment.Current.Dispatcher.BeginInvoke(() =>
                 {
                     this.RaiseReceived(message);

                 });
                 socket.ReceiveFromAsync(receiveArgs);    



         };

             socket.ReceiveFromAsync(receiveArgs);


     }

SocketException是由“socket.ReceiveFromAsync(ReceiveArgs)”调用的；我只想从手机获取一张照片，没有发送或接收操作。我不知道为什么要调用接收函数。

当应用跳转到相册(套接字的"RemoteEndPoint“值变为空)时，是否会丢失套接字通信？附注："Socket“是"socket”类的对象。如果是这样，我是否应该在每次应用跳出时重新创建“套接字”？

谢谢!

Answer 1

一旦调用了PhotoChooserTask，你的应用程序将被快速切换(甚至可能是逻辑删除)。

无论哪种方式，您的套接字都将被关闭。当你的应用被再次激活时，你将不得不重新打开你的套接字。