窗口已加载和WPF [英] Window Loaded and WPF

问题描述

我在Windows 2012 WPF项目中，我需要加载的窗口已加载事件的一些信息。我需要做到这一点的视图模型，而不是代码隐藏，虽然​​。我尝试使用下面的代码：

I have a WPF project in Windows 2012 in which I need to load some information in the Window Loaded event. I need to do this in the View Model rather than in the CodeBehind, though. I am attempting to use the following code:

在我的XAML：

<interactivity:Interaction.Behaviors>
    <behaviors:WindowLoadedBehavior LoadedCommand="{Binding WindowLoadedCommand}" />
</interactivity:Interaction.Behaviors>

在我的视图模型：

private DelegateCommand _WindowLoadedCommand;

public DelegateCommand WindowLoadedCommand
{
    get
    {
        return _WindowLoadedCommand;
    }
    private set
    {
        _WindowLoadedCommand = value;
    }
}

public ShellViewModel()
{
    WindowLoadedCommand = new DelegateCommand(WindowLoadedAction);
}

protected void WindowLoadedAction()
{
    ...
}

我的附加行为：

public class WindowLoadedBehavior : Behavior<FrameworkElement>
{
    [SuppressMessage("Microsoft.StyleCop.CSharp.MaintainabilityRules", "SA1401:FieldsMustBePrivate", Justification = "Dependency Property.  Allow public.")]
    public static DependencyProperty LoadedCommandProperty = DependencyProperty.Register("LoadedCommand", typeof(ICommand), typeof(WindowLoadedBehavior), new PropertyMetadata(null));

    public ICommand LoadedCommand
    {
        get { return (ICommand)GetValue(LoadedCommandProperty); }
        set { SetValue(LoadedCommandProperty, value); }
    }

    protected override void OnAttached()
    {
        base.OnAttached();

        AssociatedObject.Loaded += AssociatedObject_Loaded;
    }

    protected override void OnDetaching()
    {
        AssociatedObject.Loaded -= AssociatedObject_Loaded;

        base.OnDetaching();
    }

    private void AssociatedObject_Loaded(object sender, RoutedEventArgs e)
    {
        if (LoadedCommand != null)
            LoadedCommand.Execute(null);
    }
}

的

OnAttached，AssociatedObject_Loaded和LoadedCommand得到的是所有射击，但LoadedCommand集不点火，很明显，该WindowLoadedCommand在不触发。任何线索我能做些什么来得到这个工作？

The OnAttached, AssociatedObject_Loaded and LoadedCommand get are all firing, but the LoadedCommand set is not firing and, obviously, the WindowLoadedCommand isn't firing. Any clue what I can do to get this working?

推荐答案

有几个选项。他们夫妇在这里列出：

There are a few options. A couple of them listed here:

的如何调用在WPF MVVM窗口的Loaded事件？

然而，在关闭的机会你或其他任何人在乎你花费几个小时才能完成应该采取30秒的任务，你可能会想，而不是尝试。

However, in the off chance that you or anyone else cares that you are spending several hours to complete a task that should have taken 30 seconds, you might want to try this instead.

public MainWindow()
{
    InitializeComponent();

    this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
}

void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    ShellViewModel.Instance.WindowLoadedCommand.Execute(null);
}

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