Question

我遇到了一个我自己无法解决的问题。

我有一个带有“价格”属性的ObservableCollection“product”。每一秒，每件产品的价格都会发生变化。这是我的服务器部分。我有一个带有一些文本框的窗口，它绑定在price属性上。

在另一方面，我有一个客户。客户需要获得所有产品的价格。

所以，首先，我的客户端连接到我的服务器（这里没问题）。它向服务器发送消息，服务器接收它。

我的问题在于：价格属性的价值每秒都在变化，但在我的帖子中，我无法获得新的价值......

这是我的代码： - 产品：

private volatile float price;
public float Price
{
    get { return price; }
    set
    {
        price = value;
        notifyPropertyChanged("Price");
    }
}

public Product(int time)
{
    timer = new Timer(time);
    timer.Elapsed += timer_Elapsed;
    timer.Start();
}

void timer_Elapsed(object sender, ElapsedEventArgs e)
{
    this.Price++;
}

我的服务器：

private ObservableCollection<product> listGroupProduct;
public MainWindow()
{
    Thread thread;
    InitializeComponent();
    this.DataContext = this;

    // Create the server
    thread = new Thread(() => createServer(ref listGroupProduct));
    thread.Start();
}
public static void createServer(ref ObservableCollection<Product> list)
{
    string client = "";
    try
    {
        IPAddress ipAdress = IPAddress.Parse("192.168.1.50");
        TcpListener listener = new TcpListener(ipAdress, 1220);

        listener.Start();
        socket = listener.AcceptSocket();

        // Receive client name
        client = ReceiveMessage(100);
        MessageBox.Show("New client connected : " + client);

        // Send number of products
        SendMessage(list.Count.ToString());

        // Get articles request from a client
        ReceiveMessage(8);

        // Send all articles
        while (true)
        {
            for (int i = 0; i < 3; i++)
            {
                if (articlesString != "")
                    articlesString += "|";
                articlesString += list[i].Price + ";";
            }
            byte[] bytes = new byte[list.Count * 50];
            bytes = System.Text.Encoding.ASCII.GetBytes(articlesString.ToCharArray());
            socket.Send(bytes);
        }
    }
    catch (Exception e)
    {
        MessageBox.Show(e.Message);
    }
}

private static void SendMessage(string p)
{
    byte[] bytes = new byte[p.Length];
    bytes = System.Text.Encoding.ASCII.GetBytes(p.ToCharArray());

    socket.Send(bytes);
}

private static string ReceiveMessage(int p)
{
    string tmp = "";

    byte[] b = new byte[p];
    int k = socket.Receive(b);
    for (int i = 0; i < k; i++)
        tmp += Convert.ToChar(b[i]);

    return tmp;
}

我的客户：

private StreamSocket streamSocket;
public string Server = "192.168.1.89";
public int Port = 1220;

IInputStream inputStream;
IOutputStream outputStream;

public MainPage()
{
    this.InitializeComponent();
    CreateSocket();
}

void timer_Tick(object sender, object e)
{
    SendMessage("articles");
    toto.Text = "Message send : articles";

    GetAllArticles();
}

private async void GetAllArticles()
{
    toto.Text = await GetMessage(50);
    toto.Text = "Waiting articles...";
    toto.Text = await GetMessage(articlesNumber * 50));
}

private async Task CreateConnection()
{
    SendMessage("tablet");
    toto.Text = "message send : tablet";

    articlesNumber = int.Parse(await GetMessage(1));
    toto.Text = "Number articles : " + articlesNumber.ToString();
}

private async void CreateSocket()
{
    DispatcherTimer timer = new DispatcherTimer();

    streamSocket = new StreamSocket();
    await streamSocket.ConnectAsync(new HostName(Server), Port.ToString());

    inputStream = streamSocket.InputStream;
    outputStream = streamSocket.OutputStream;

    timer.Interval = new TimeSpan(0, 0, 1);
    timer.Tick += timer_Tick;

    // Envoi du nom et réception du nombre d'articles
    await CreateConnection();

     // Réception de tous les articles chaque secondes
    SendMessage("tablet");
    timer.Start();
}

private async void SendMessage(string message)
{
    IBuffer buffer = CryptographicBuffer.ConvertStringToBinary(message, BinaryStringEncoding.Utf8);
    await outputStream.WriteAsync(buffer);
}

private async Task<string> GetMessage(int size)
{
    byte[] tmp = new byte[size];
    IBuffer buffer1 = CryptographicBuffer.CreateFromByteArray(tmp);

    toto.Text = "Waiting message... (size : " + size.ToString() + ")";
    await inputStream.ReadAsync(buffer1, (uint)size, InputStreamOptions.None);
    toto.Text = "Message received !";

    return CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8, buffer1);
}

（顺便说一下：“toto”是我用来调试的文本框:)）

您知道为什么我的客户端能够很好地获得第一个值，但是当我在服务器端更改值时，我的客户端会继续获得相同的值而不是新值吗？

Answer 1

看起来服务器具有无限循环并且一遍又一遍地重新发送相同的数据。在“发送所有文章”评论后，CreateServer立即拥有无限循环。

访问线程内列表中的对象属性

1 个答案: