class MouseEventListener
    {
        private Control target = null;
        public event MouseEventHandler MouseLeftButtonClick;
        public MouseEventListener(Control target)
        {
            this.target = target;
            target.MouseClick  += new MouseEventHandler(target_MouseClick);
        }
        private void target_MouseClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (MouseLeftButtonClick != null)
                {
                    MouseLeftButtonClick(target, e);
                }
            }
        }
    }

这个类的构造函数接受一个Control类型的对象，然后捕捉它的mouseClick事件。当事件发生时，判断是否由鼠标左键激发，如果是则触发自己的MouseLeftButtonClick事件。原来窗体中的事件处理则可以简化，只需在窗体中维持一个侦听器，然后取它的MouseLeftButtonclick事件即可。

     public partial class Form1 : Form
     {
         private MouseEventListener listener = null;
         public Form1()
        {
            InitializeComponent();
            listener = new MouseEventListener(this );
            listener.MouseLeftButtonClick +=
                new MouseEventHandler(listener_MouseLeftButtonClick);
        }

        private void listener_MouseLeftButtonClick(object sender, MouseEventArgs e)
        {
            MessageBox.Show("Click");
        }
    }

摘自《更锋利的C#代码》。