C#鼠标单击事件代码问题


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
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 WpfBrowserApplication1
{
    /// <summary>
    /// Interaction logic for Page1.xaml
    /// </summary>
    public partial class Page1 : Page
    {
        public Page1()
        {
            InitializeComponent();
        }        private void button1_MouseDown(object sender, MouseEventArgs e) 
        { 
           
            if (e.Button == MouseButtons.Left) 
            { 
                MessageBox.Show("left");
            } 
            else 
            { 
                MessageBox.Show("right"); 
            }
        }
    }
}第31行Button和MouseButtons不对，新人求指教。是不是少加载什么类了啊？c#button