public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();             this.button1.Enter += button_Enter;            this.button1.Leave += button_Leave;             this.button2.Enter += button_Enter;            this.button2.Leave += button_Leave;             //继续写其他的        }         void button_Leave(object sender, EventArgs e)        {            (sender as Button).BackColor = SystemColors.Control;        }         void button_Enter(object sender, EventArgs e)        {            (sender as Button).BackColor = Color.Red;        }    }

 

//给每个按钮全部订阅一样的点击事件button1.Click += button_Click;button2.Click += button_Click;button3.Click += button_Click;private void button_Click(object sender, EventArgs e){    Button[] btnArr = { button1, button2,button3 };    Button btn = sender as Button;//当前按钮    btn.BackgroundImage = Resource1.backImg1;//将当前按钮背景设为backImg1，Resource1是资源文件类名    //剩下的除当前按钮外，全部设另一个背景    Array.ForEach(btnArr.Where(p => p != btn).ToArray(), p => p.BackgroundImage = Resource1.backImg2);}