Winform 控件添加事件

Winform 控件添加事件
        /// <summary>
        /// 添加按钮上鼠标 移入、移出、按下、弹起 事件
        /// </summary>
        /// <param name="btn">操作的按钮</param>
        private void AddBtnEvent(Button btn)
        {
            btn.MouseEnter += delegate (object sender, EventArgs e)
            {
                ((Button)sender).BackgroundImage = Resources.btnMouseEnter;
            };
            btn.MouseLeave += delegate (object sender, EventArgs e)
            {
                ((Button)sender).BackgroundImage = Resources.btnMouseLeave;
            };
            btn.MouseDown += delegate (object sender, MouseEventArgs e)
            {
                ((Button)sender).BackgroundImage = Resources.btnMouseDown
            };
            btn.MouseUp += delegate (object sender, MouseEventArgs e)
            {
                ((Button)sender).BackgroundImage = Resources.btnMouseUp;
            };
        }

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