如何捕获扩展器标题按钮单击事件

Question

I have an expander with button on the expander headers. I would like to know on which expanders header is clicked the button, because i should modify the data on the button_click event. If I Don`t have binded it with a View Model

<Expander IsExpanded="True">
    <Expander.Header>
        <StackPanel Orientation="Horizontal">
            <Button Name="btnAllDone" Click="btnAllDone_Click  >Close
            </Button>
        </StackPanel>
    </Expander.Header>
    <Expander.Content>
        <ItemsPresenter/>
    </Expander.Content>
</Expander>

AND this is the click event

private void btnAllDone_Click(object sender, RoutedEventArgs e)
{
    MessageBoxResult result = MessageBox.Show("Are you sure?", "All", MessageBoxButton.YesNo);
    switch (result)
    {
        case MessageBoxResult.Yes:
            try
            {

            //AND HERE I WANT TO MODIFY THE DATA(MYOBJECT) OF THE CURRENT EXPANDER HEADER GROUP
            }
            catch (Exception ex)
            {

                throw;
            }
            break;
        case MessageBoxResult.No:
            break;
    }
}

Answer 1

looks like expander, button, and event handler correspond 1-to-1. so assign Name to expander, and use it in event handler:

<Expander x:Name="expanderAllDone" IsExpanded="True">
    <Expander.Header>
        <StackPanel Orientation="Horizontal">
            <Button Name="btnAllDone" Content="Close" Click="btnAllDone_Click"/>
        </StackPanel>
    </Expander.Header>
    <Expander.Content>
        <ItemsPresenter/>
    </Expander.Content>
</Expander>

private void btnAllDone_Click(object sender, RoutedEventArgs e)
{
    MessageBoxResult result = MessageBox.Show("Are you sure?", "All", MessageBoxButton.YesNo);
    if (result != MessageBoxResult.Yes) 
        return;

    try
    {
        expanderAllDone.IsExpanded = false;
    }
    catch (Exception ex)
    {
        throw;
    }
}

Answer 2

那么你可以添加扩展器的名称属性，这样你就可以检查生成了哪个扩展器事件

Answer 3

Try this:

private static T GetParent<T>(DependencyObject child) where T : class
{
    var parent = VisualTreeHelper.GetParent(child);
    if (parent == null) return null;
    else if (parent is T) return parent as T;
    else return GetParent<T>(parent);
}

private void btnAllDone_Click(object sender, RoutedEventArgs e)
{
    // Get current button
    var button = (Button)sender;

    // Get current expander
    var expander = GetParent<Expander>(button);

    // Toggle expander
    expander.IsExpanded = !expander.IsExpanded;
}