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我在 winform 中托管了 WPF 控件，其中包含菜单和一些标签。WPF 控件连接到 Internet 以下载一些数据。我将代码分为两个步骤，首先设置控件属性，第二个连接到网络，第二个在线程内运行，但是在 WPF 控件完成他的两个步骤之前，Winform 控件不会在窗体上发生。

我已经尝试了许多方法来使其具有线程能力，但所有方法都指向同一个目的地。

代码 1- 加载 WPF 控件

private void MDI_Load(object sender, EventArgs e)
    {
        MenuManager.FillMenu(MainMenu); // I have filled WinForm Menu first, but it doesn't appear until WPF finish

        #region = WPF Control =

        wpfManager.AddweatherControl();
        wpfManager.weatherManager.Start(); // This have to run in another thread

        #endregion
}

2- wpfManager.weatherManager.Start

    public void Start()
{
    //var tsk = System.Threading.Tasks.Task.Factory.StartNew(GetWeather);
    //tsk.ContinueWith(t => { MessageBox.Show(t.Exception.InnerException.Message); },
    //   System.Threading.CancellationToken.None, System.Threading.Tasks.TaskContinuationOptions.OnlyOnFaulted,
    //   System.Threading.Tasks.TaskScheduler.FromCurrentSynchronizationContext());

    //System.Threading.Thread t = new System.Threading.Thread(
    //    () => weatherControl.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(GetWeather))
    //    );
    //t.SetApartmentState(System.Threading.ApartmentState.STA);
    //t.Start();

    weatherControl.Dispatcher.BeginInvoke(new Action(GetWeather), new object[] { });
}

void GetWeather()
{
    #region = Weather =
    Yweather.Getweather(UserManager.CurrentUser.Preferences.WeatherCity);

    if (Yweather.Online && Yweather.IDayForecast.Count > 0)
    {
        weatherControl.CurrentDegree.Text = Yweather.IDayForecast[0].CurrentTemperature.ToString();
        weatherControl.WeatherTypeName.Text = Yweather.IDayForecast[1].WeatherText;
        weatherControl.AllDayDegree.Text = Yweather.IDayForecast[1].LowTemperature + " - " + Yweather.IDayForecast[1].HighTemperature;
        weatherControl.WeatherType.Source = wpfManager.BitmapToImageSource(Yweather.IDayForecast[0].Image);

        xWeatherDay weatherday1 = weatherControl.OhterDaysPanel.Children[0] as xWeatherDay;
        weatherday1.AllDayDegree.Text = Yweather.IDayForecast[2].LowTemperature + " - " + Yweather.IDayForecast[2].HighTemperature;
        weatherday1.WeatherType.Source = wpfManager.BitmapToImageSource(Yweather.IDayForecast[2].Image);
    }
    else
    {
        weatherControl.CurrentDegree.Text = "0";
        weatherControl.WeatherTypeName.Text = "NAN";
        weatherControl.AllDayDegree.Text = "0 - 0";
        weatherControl.WeatherType.Source = wpfManager.BitmapToImageSource(Yweather.OfflineImage);
    }

    #endregion
}
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1 回答 1

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从您发布的代码看来，延迟是由于GetWeather在 UI 线程上运行造成的。假设这weatherControl是 WPF 控件的一个实例，它在 UI 线程上运行，因为这是它的调度程序所属的线程。

如果您想在后台线程上运行代码，一种简单的方法是使用BackgroundWorker。你可以像这样使用它：

public void Start()
{
    var worker = new BackgroundWorker();
    worker.DoWork += (sender, args) =>
    {
        GetWeather();
        // put the results of getting the weather in to args.Result
    };
    worker.RunWorkerCompleted += (sender, args) =>
    {
        // use args.Result to update the UI
    };
    worker.RunWorkerAsync();
}

事件处理程序中的代码在DoWork后台线程上运行，而RunWorkerCompleted事件处理程序中的代码在 UI 线程上运行。

于 2013-05-28T23:35:12.103 回答