Question

请原谅我对这个问题的无知，但我没有受过异步编程的教育。但是，我相信我的代码已接近实现我需要它做的事情。

基本上下面的代码仅适用于第一个

C61 = new BridgeViewModel("C61");
await C61.Initialize();

语句。没有其他项目将任何数据返回到绑定的.xaml，我不知道为什么。每个人都需要在自己的Initialize函数中吗？

非常感谢任何帮助。

代码：

namespace SentinelApp
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            var vm = new MainViewModel();
            DataContext = vm;
            vm.Initialize();
        }
    }

    public class MainViewModel
    {
        public readonly string[] Bridges = { "C61", "C62", "C63", "C68", "C69", "K71", "K72", "K73", "K74", "T91", "GN01", "GE01", "GA01" };
        public async Task Initialize()
        {
            C61 = new BridgeViewModel("C61");
            await C61.Initialize();
            C62 = new BridgeViewModel("C62");
            await C62.Initialize();
            C63 = new BridgeViewModel("C63");
            await C63.Initialize();
            C68 = new BridgeViewModel("C68");
            await C68.Initialize();
            C69 = new BridgeViewModel("C69");
            await C69.Initialize();
            K71 = new BridgeViewModel("K71");
            await K71.Initialize();
            K72 = new BridgeViewModel("K72");
            await K72.Initialize();
            K73 = new BridgeViewModel("K73");
            await K73.Initialize();
            K74 = new BridgeViewModel("K74");
            await K74.Initialize();
            T91 = new BridgeViewModel("T91");
            await T91.Initialize();
            GA01 = new BridgeViewModel("GA01");
            await GA01.Initialize();
            GE01 = new BridgeViewModel("GE01");
            await GE01.Initialize();
            GN01 = new BridgeViewModel("GN01");
            await GN01.Initialize();
        }

        public BridgeViewModel C61 { get; set; }
        public BridgeViewModel C62 { get; set; }
        public BridgeViewModel C63 { get; set; }
        public BridgeViewModel C68 { get; set; }
        public BridgeViewModel C69 { get; set; }
        public BridgeViewModel K71 { get; set; }
        public BridgeViewModel K72 { get; set; }
        public BridgeViewModel K73 { get; set; }
        public BridgeViewModel K74 { get; set; }
        public BridgeViewModel T91 { get; set; }
        public BridgeViewModel GA01 { get; set; }
        public BridgeViewModel GE01 { get; set; }
        public BridgeViewModel GN01 { get; set; }
    }

    public class BridgeViewModel : ViewModel
    {
        private readonly ClientWrapper _client;
        private readonly string _bridge;
        private readonly Timer _timer = new Timer();
        public BridgeViewModel(string bridge)
        {
            _client = new ClientWrapper();
            _bridge = bridge;
        }

        public async Task Initialize()
        {
            await _client.Connect(_bridge);
            await _client.SendMessage(new SessionStart("3", "25").CreateBridgeMessage());

            _timer.Interval = 1000;
            _timer.Elapsed += Update;
            _timer.Start();
        }

        private async void Update(object sender, ElapsedEventArgs e)
        {
            try {
                var response = await _client.SendMessage("BS~RESERVE~STATS~REQ~" + _bridge + "~0");
                var split = response.Split('~');

                Timestamp = split[4].Substring(0, 2) + ":" + split[4].Substring(2, 2) + ":" + split[4].Substring(4, 2);
                FreePorts = split[6];
                LongestHold = TimeSpan.FromSeconds(int.Parse(split[15])).ToString("hh:mm");
                Bells = split[12];
                Signals = split[8];
            } catch { }
        }

        private string _timestamp;
        public string Timestamp
        {
            get { return _timestamp; }
            set { _timestamp = value; RaisePropertyChanged(); }
        }

        private string _bells;
        public string Bells
        {
            get { return _bells; }
            set { _bells = value; RaisePropertyChanged(); }
        }

        private string _signals;
        public string Signals
        {
            get { return _signals; }
            set { _signals = value; RaisePropertyChanged(); }
        }

        private string _freeports;
        public string FreePorts
        {
            get { return _freeports; }
            set { _freeports = value; RaisePropertyChanged(); }
        }

        private string _longesthold;
        public string LongestHold
        {
            get { return _longesthold; }
            set { _longesthold = value; RaisePropertyChanged(); }
        }
    }
}

Answer 1

不要在构造函数中使用异步方法，而是在docs事件中注册并使用它await：

public MainWindow()
{
    InitializeComponent();
    Loaded += InitializeOnLoaded;
}

public async void InitializeOnLoaded(object sender, RoutedEventArgs e)
{
    var vm = new MainViewModel();
    DataContext = vm;
    await vm.InitializeAsync();
}

异步功能只更新一个“等待”

1 个答案: