CentralizedControl/HandyControl/HandyControl_Shared/Interactivity/Commands/ShutdownAppCommand.cs

using System;
using System.Windows;
using System.Windows.Input;

namespace HandyControl.Interactivity;

public class ShutdownAppCommand : ICommand
{
    public bool CanExecute(object parameter) => true;

    public void Execute(object parameter) => Application.Current.Shutdown();

    public event EventHandler CanExecuteChanged;
}