wpf Mainwindow关闭时如何关闭所有窗口

How to close all the windows when Mainwindow closes

提问by Zoya Sheikh

I am working on WPF. There is Mainwindow which opens as application starts. There are two buttons within this window. Each open a new window. e.g There are Add and update buttons. Add button opens a Add-Item window on its click event call and similarly update opens it's window "Update-Item". If i close Mainwindow these two windows "Add-Item" and "Update-Item" remains open. I want that if i close Mainwindow, these other two windows should also close with it.

我正在研究 WPF。主窗口在应用程序启动时打开。此窗口中有两个按钮。每个打开一个新窗口。例如，有添加和更新按钮。添加按钮在其单击事件调用上打开一个添加项目窗口，类似地更新打开它的窗口“更新项目”。如果我关闭 Mainwindow，这两个窗口“Add-Item”和“Update-Item”保持打开状态。我希望如果我关闭 Mainwindow，其他两个窗口也应该随之关闭。

app.current.shutdown

app.current.shutdown is used mostly. My Question is: Where i have to post this code line in my program, in mainwindow or in App.config. Should i have to call any event or function in it's response too?

app.current.shutdown 最常用。我的问题是：我必须在我的程序、主窗口或 App.config 中发布此代码行。我也应该在它的响应中调用任何事件或函数吗？

回答by H.B.

Set Application.MainWindowto the instance of your main window and make sure the Application.ShutdownModeis OnMainWindowClose.

设置Application.MainWindow为主窗口的实例并确保Application.ShutdownMode是OnMainWindowClose.

Also if you do not want the whole application to shut down: Make the MainWindowthe Ownerof the child windows. (This has other side effects)

此外，如果你不希望整个应用程序关闭：使MainWindow该Owner子窗口。（这还有其他副作用）

回答by J45

You can also set ShutdownMode in the App.xaml file:

您还可以在 App.xaml 文件中设置 ShutdownMode：

<Application x:Class="WpfApp1.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApp1"
    StartupUri="MainWindow.xaml"
    ShutdownMode="OnMainWindowClose">
    <Application.Resources>
    </Application.Resources>
</Application>

回答by Forest Kunecke

I think the solution is to set the Ownerproperty of each of the sub-windows to your main window. That way, any window action performed on your main window is also performed on all of the other windows:

我认为解决方案是将Owner每个子窗口的属性设置为您的主窗口。这样，在主窗口上执行的任何窗口操作也会在所有其他窗口上执行：

http://msdn.microsoft.com/en-us/library/system.windows.window.owner.aspx

http://msdn.microsoft.com/en-us/library/system.windows.window.owner.aspx

回答by Mehrad

Since in the first glance it's quite hard to figure out the right way of doing what our friends advised I proceed with a little example (best practice) code.

因为乍一看很难找出正确的方法来做我们朋友的建议，所以我继续使用一些示例（最佳实践）代码。

This is what Josh Smithshows how your App.xaml.csshould look like.

这就是Josh Smith展示的App.xaml.cs应该是什么样子。

namespace MyApplication
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        static App()
        {
            // Ensure the current culture passed into bindings is the OS culture.
            // By default, WPF uses en-US as the culture, regardless of the system settings.
            //
            FrameworkElement.LanguageProperty.OverrideMetadata(
              typeof(FrameworkElement),
              new FrameworkPropertyMetadata(XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.IetfLanguageTag)));
        }

        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

            var window = new MainWindow();

            // To ensure all the other Views of a type Window get closed properly.
            ShutdownMode = ShutdownMode.OnMainWindowClose;

            // Create the ViewModel which the main window binds.
            var viewModel = new MainWindowViewModel();

            // When the ViewModel asks to be closed,
            // close the window.
            EventHandler handler = null;
            handler = delegate
            {
                viewModel.RequestClose -= handler;
                window.Close();
            };
            viewModel.RequestClose += handler;

            // Allow all controls in the window to bind to the ViewModel by
            // setting the DataContext, which propagates down the element tree.
            window.DataContext = viewModel;
            window.Show();
        }
    }
}

Again, at the end of the day, it's up to you how you would want to layout your MVVM application.

同样，在一天结束时，您希望如何布局 MVVM 应用程序取决于您。