using System;
using System.Windows;
using System.Windows.Input;
 
namespace WpfApp1
{
    /// <summary>
    /// MainWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
 
            DataContext = new ViewModel();
        }
    }
 
    class ViewModel
    {
        FooModel fooModel = new FooModel();
 
        public ICommand testbutton { get; set; }
 
        public ViewModel()
        {
            testbutton = new TestButtonCommand { model = fooModel };
        }
    }
 
    class TestButtonCommand : ICommand
    {
        public event EventHandler CanExecuteChanged;
 
        public bool CanExecute(object parameter) => true; // ←ここをfalseにするとボタン押せないのを確認する
 
        public void Execute(object parameter)
        {
            model.test();
        }
 
        public FooModel model { get; set; }
    }
 
    class FooModel
    {
        public void test()
        {
            MessageBox.Show("Test");
        }
    }
}
 

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