C#判断鼠标是否在控件内(解决鼠标离开到子控件也触发MouseLeave事件)

参考链接:https://blog.csdn.net/blademainer/article/details/8560605

当前示例是使用自定义控件,继承UserControl
鼠标进入控件区域改变背景颜色,离开控件区域更改回来

public partial class MyButton : UserControl
    {
        private Color saveColor = Color.WhiteSmoke;
        public MyButton()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 重写OnControlAdded方法，为每个子控件添加MouseEnter和MouseLeave事件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnControlAdded(ControlEventArgs e)
        {
            Control control = e.Control; // 获取添加的子控件
            control.MouseEnter += this.MyButton_MouseEnter;//为子控件注册鼠标进入控件事件
            control.MouseLeave += this.MyButton_MouseLeave;//为子控件注册鼠标离开控件事件
            base.OnControlAdded(e);
        }
        /// <summary>
        /// 鼠标进入控件可视部分
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void MyButton_MouseEnter(object sender, EventArgs e)
        {
            this.BackColor = Color.FromArgb(204, 232, 207);
        }
        /// <summary>
        /// 鼠标离开控件可视部分
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void MyButton_MouseLeave(object sender, EventArgs e)
        {
            //鼠标离开当前工作区域(控件区域)?
            if (!this.RectangleToScreen(this.ClientRectangle).Contains(Control.MousePosition))
            {
                this.BackColor = Color.WhiteSmoke;
            }
        }
    }