@z 什么什么 @ME @LY 都在吗？
急死我了，一上午就在这里解决……
问题：我用UDP（IP四个255，端口2102）发送“0101”的包，自己接收不到？从来没有触发“Message Received”事件！
啊啊啊！
（code有点长，非重点部分请忽略）
using ATh.Controls;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Networking;
using Windows.Networking.Sockets;
using Windows.Storage.Streams;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// “空白页”项模板在 http://go.microsoft.com/fwlink/?LinkId=234238 上有介绍

namespace ATh.FirstPages
{
/// <summary>
/// 可用于自身或导航至 Frame 内部的空白页。
/// </summary>
public sealed partial class DeviceDiscovery : Page
{

DatagramSocket socket = null;

public DeviceDiscovery()
{
this.InitializeComponent();


Loaded += OnLoaded;
Unloaded += OnUnloaded;

}

List<DeviceClass> ReceiveList = new List<DeviceClass>();

private void OnUnloaded(object sender, RoutedEventArgs e)
{
if (socket != null)
{
socket.MessageReceived -= OnMsgReceived;
socket.Dispose();
socket = null;
}
}

private async void OnLoaded(object sender, RoutedEventArgs e)
{
socket = new DatagramSocket();
socket.Control.MulticastOnly = false;
socket.MessageReceived += OnMsgReceived;
await socket.BindServiceNameAsync("2102");
}



private async void OnMsgReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
{

uint stringLength = args.GetDataReader().UnconsumedBufferLength;
string receivedMessage = args.GetDataReader().ReadString(stringLength);

await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, () =>
{

if (receivedMessage != null && stringLength == 4)
{
DeviceClass DvItem = new DeviceClass { DeviceCode = receivedMessage };
DvItem.CodeToItem();
ReceiveList.Add(DvItem);

System.Diagnostics.Debug.WriteLine(DvItem.ToString());


DvItem = null;

DevicesView.ItemsSource = ReceiveList;

}


});
}



private void IsLoaded(object sender, RoutedEventArgs e)
{
StatusChecker statusChecker = new StatusChecker();
TimerCallback tcb = statusChecker.CheckStatus;
Timer stateTimer = new Timer(tcb, null, 0, 5000);
}

private void Next_Click(object sender, RoutedEventArgs e)
{
Frame.Navigate(typeof(Eula));
}

private void DevicesView_ItemChanged(FrameworkElement sender, DataContextChangedEventArgs args)
{
NextButton.Content = "Next";
}
}

class StatusChecker
{
public StatusChecker()
{
}

public async void CheckStatus(object stateInfo)
{



using (DatagramSocket socket = new DatagramSocket())
{
Windows.Storage.ApplicationDataContainer localSettings =
Windows.Storage.ApplicationData.Current.LocalSettings;
Windows.Storage.StorageFolder localFolder =
Windows.Storage.ApplicationData.Current.LocalFolder;
if (localSettings.Values["Node"] != null)
{

string content = (string)localSettings.Values["Node"];

HostName broardaddr = new HostName(IPAddress.Broadcast.ToString());
IOutputStream outstream = await socket.GetOutputStreamAsync(broardaddr, "2102");
DataWriter writer = new DataWriter(outstream);
writer.UnicodeEncoding = UnicodeEncoding.Utf8;
//uint len = writer.MeasureString(content);
//writer.WriteUInt32(len);
writer.WriteString(content);
await writer.StoreAsync();
writer.Dispose();

}

}

}
}

}