WPF MVVM：如何关闭窗口

如何在WPF MVVM中关闭窗口

csharp
// ViewModel中定义一个关闭窗口的命令
public ICommand CloseWindowCommand { get; private set; }
// 在构造函数中初始化CloseWindowCommand
public MyViewModel()
{
    CloseWindowCommand = new RelayCommand(CloseWindow);
}
// 执行关闭窗口的逻辑
private void CloseWindow()
{
    // 关闭窗口的代码
    Application.Current.MainWindow.Close();
}

xaml

csharp
// ViewModel中定义一个关闭窗口的事件
public event EventHandler CloseWindowEvent;
// 执行关闭窗口的逻辑
private void CloseWindow()
{
    // 引发关闭窗口的事件
    CloseWindowEvent?.Invoke(this, EventArgs.Empty);
}

csharp
public partial class MyView : Window
{
    public MyView()
    {
        InitializeComponent();
        DataContext = new MyViewModel();
        // 订阅关闭窗口的事件
        (DataContext as MyViewModel).CloseWindowEvent += CloseWindowHandler;
    }
    // 执行关闭窗口的逻辑
    private void CloseWindowHandler(object sender, EventArgs e)
    {
        Close();
    }
}

csharp
// ViewModel中发送关闭窗口的消息
private void CloseWindow()
{
    // 发送关闭窗口的消息
    Messenger.Default.Send(new CloseWindowMessage());
}

csharp
public partial class MyView : Window
{
    public MyView()
    {
        InitializeComponent();
        DataContext = new MyViewModel();
        // 订阅关闭窗口的消息
        Messenger.Default.Register(this, CloseWindowHandler);
    }
    // 执行关闭窗口的逻辑
    private void CloseWindowHandler(CloseWindowMessage message)
    {
        Close();
    }
}