Question

我的MainWindow中有一个CheckBox，它可以作为一个切换来打开和关闭另一个窗口（比方说NextWindow）。简单地说，直到现在我所做的是：

选中CheckBox时，会打开另一个窗口
取消选中CheckBox时，会关闭已打开的窗口

现在我想要的是当用户手动关闭NextWindow时更改CheckBox状态。我需要做什么？
这是我的代码：

对于MainWindow.XAML

<Window x:Class="WpfApplication2.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="100" Width="100">
<Grid>
    <CheckBox Name="chk" Checked="chk_Checked_1" Unchecked="chk_Unchecked_1" Margin="20">Window</CheckBox>
</Grid>

对于MainWindow.xaml.cs

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void chk_Checked_1(object sender, RoutedEventArgs e)
    {
        NextWindow nw = new NextWindow();
        nw.Show();
    }

    private void chk_Unchecked_1(object sender, RoutedEventArgs e)
    {
        var window = IsWindowOpen<Window>("Next");

        if (window != null)
        {
            window.Close();
        }           
    }
    public static T IsWindowOpen<T>(string name = null)
    where T : Window
    {
        var windows = Application.Current.Windows.OfType<T>();
        return string.IsNullOrEmpty(name) ? windows.FirstOrDefault() : windows.FirstOrDefault(w => w.Name.Equals(name));
    }
}

对于NextWindow.xaml

<Window x:Class="WpfApplication2.NextWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="NextWindow" Height="100" Width="100" Name="Next">
<Grid>
    <Label Margin="20">Hello</Label>
</Grid>

Answer 1

好的，我按照评论中建议的this link对我的代码进行了以下更改：

主窗口

private void chk_Checked_1(object sender, RoutedEventArgs e)
    {
        NextWindow nw = new NextWindow();
        nw.Closed += nw_Closed;
        nw.Show();
    }

    void nw_Closed(object sender, EventArgs e)
    {
        chk.IsChecked = false;
    }

Answer 2

只需更改uncheck事件处理程序：

private void chk_Unchecked_1(object sender, RoutedEventArgs e)
    {
        var window = IsWindowOpen<Window>("Next");

        if (window != null)
        {
            window.Close();
            ((CheckBox)sender).IsChecked = false;    
        }           
    }

窗口关闭时复选框状态更改

2 个答案: