C# 窗口加载和 WPF
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/12589772/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Window Loaded and WPF
提问by Dirk Dastardly
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:
我在 Windows 2012 中有一个 WPF 项目，我需要在 Window Loaded 事件中加载一些信息。不过，我需要在视图模型中而不是在 CodeBehind 中执行此操作。我正在尝试使用以下代码：
In my xaml:
在我的 xaml 中：
<interactivity:Interaction.Behaviors>
<behaviors:WindowLoadedBehavior LoadedCommand="{Binding WindowLoadedCommand}" />
</interactivity:Interaction.Behaviors>
In my View Model:
在我的视图模型中：
private DelegateCommand _WindowLoadedCommand;
public DelegateCommand WindowLoadedCommand
{
get
{
return _WindowLoadedCommand;
}
private set
{
_WindowLoadedCommand = value;
}
}
public ShellViewModel()
{
WindowLoadedCommand = new DelegateCommand(WindowLoadedAction);
}
protected void WindowLoadedAction()
{
...
}
My attached behavior:
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);
}
}
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?
OnAttached、AssociatedObject_Loaded 和 LoadedCommand get 都在触发，但 LoadedCommand 集没有触发，显然，WindowLoadedCommand 没有触发。任何线索我能做些什么来让它工作？
采纳答案by Harlow Burgess
There are a few options. A couple of them listed here:
有几个选项。这里列出了其中的几个：
how to call a window's Loaded event in WPF MVVM?
如何在 WPF MVVM 中调用窗口的 Loaded 事件？
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.
但是，如果您或其他任何人担心您花费几个小时来完成本应花费 30 秒的任务，您可能想尝试一下。
public MainWindow()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
}
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
ShellViewModel.Instance.WindowLoadedCommand.Execute(null);
}
