WPF - 家长如何知道子控件复选框的“已选中”事件？

Question

I have a child control that has a checkbox and webbrowser:

<UserControl x:Class="Some.MyUserControl" etc.>
  <Grid>
    <CheckBox x:Name="chkA" Content="Analysis" Checked="chkA_Checked"></CheckBox>
    <WebBrowser Margin="0,30,0,0" Name="wbA"></WebBrowser>
  </Grid>
</UserControl>

I am putting this control in my MainWindow.xaml/.cs:

<Window x:Class Some.MainWindow xmlns:local="clr-namespace:Some" etc.>
  <Grid>
    <local:MyUserControl x:Name="MyUserControl_Main"></local:MyUserControl>
  </Grid>
</Window>

My question is how can my MainWindow know that the CheckBox (chkA) has been checked? So far only the actual user control knows it has been clicked? How can I expose the "Checked" event for my MainWindow to see? Or is there a better way?

I've searched the web, but can't seem to wrap my head around what I'm seeing.

Thank you in advance,

-newb

EDIT 1:

I am trying the following with no luck, but may be on the right track.

Within my MainWindow.xaml.cs I have added:

public static readonly RoutedEvent CheckedEvent = EventManager.RegisterRoutedEvent("Checked", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(MyUserControl));

public event RoutedEventHandler Checked
{
    add { AddHandler(CheckedEvent, value); }
    remove { RemoveHandler(CheckedEvent, value); }
}

And within MyUserControl.xaml.cs I have added:

private void chkA_Checked(object sender, RoutedEventArgs e)
{
    RoutedEventArgs args = new RoutedEventArgs(MainWindow.CheckedEvent);
    RaiseEvent(args);
}

EDIT 2:

Moved previously mentioned code into MyUserControl.xaml.cs:

public static readonly RoutedEvent CheckedEvent = EventManager.RegisterRoutedEvent("Checked", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(MyUserControl));

public event RoutedEventHandler Checked
{
    add { AddHandler(CheckedEvent, value); }
    remove { RemoveHandler(CheckedEvent, value); }
}

private void chkA_Checked(object sender, RoutedEventArgs e)
{
    RoutedEventArgs args = new RoutedEventArgs(MainWindow.CheckedEvent);
    RaiseEvent(args);
}

And now I am able to see the "Checked" event "Bubble" up as so:

<Window x:Class Some.MainWindow xmlns:local="clr-namespace:Some" etc.>   
  <Grid>     
    <local:MyUserControl x:Name="MyUserControl_Main" **Checked="MyUserControl_Main_Checked"**></local:MyUserControl>   
  </Grid>
</Window>

Thanks @Matt for the tip!

EDIT 3:

Matt's first answer is the best way to go, I had it "Checkbox" vs "CheckBox"... Adding CheckBox.Checked to the grid catches the event:

Answer 1

Let the Checked event bubble up to the parent and catch it there. It's the beauty of routed events!

<Grid CheckBox.Checked="CheckBox_Checked">
    <local:MyUserControl x:Name="MyUserControl_Main" />
</Grid>

Answer 2

You're on the right track, but you should declare the routed event in MyUserControl , not in MainWindow ... it's the user control that is raising the event, not the window. The way you're doing it, your control is explicitly depending on MainWindow , which is bad practice and not necessary.