CommandParameter得使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp8
{
    /// 

    /// MainWindow.xaml 的交互逻辑
    /// 
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            if (string.IsNullOrEmpty(txt.Text))
            {
                e.CanExecute = false;
            }
            else
            {
                e.CanExecute = true;
            }
        }

        private void CommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            string name = txt.Text;
            MessageBox.Show(e.Parameter.ToString());
        }
    }
}