Question

我在winform中托管的WPF控件有Menu和一些标签。 WPF控件连接到Internet以下载一些数据。我将代码分为两步首先只设置控件属性第二个连接到网络第二个在线程内部运行，但是在WPF控件完成他的两个步骤之前，Winform控件不会在表单上发生。

我尝试了许多方法使其成为可线程的但是所有的方式都去了同一个目的地。

CODE 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
}

Answer 1

从您发布的代码看起来，延迟是由于在UI线程上运行GetWeather。假设weatherControl是WPF控件的一个实例，它在UI线程上运行，因为这是其调度程序所属的线程。

如果要在后台线程上运行代码，一种简单的方法是使用BackgroundWorker。你可以使用这样的东西：

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();
}

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

在WinForm块中托管的WPF控件即使使用线程也可以加载WinForm控件

1 个答案: