MonthCalendar(日历控件)扩展DoubleClick事件

MonthCalendar(日历控件)扩展DoubleClick事件
转自海道的博客

C#初学并不是很难，学过C，学过JAVA就能很容易入门，但仅仅是入门而已！真正的较量是在开发过程中碰到的一些实际的问题，昨天在开发一个和日历控件（MonthCalendar）有关联的项目，本想使用DoubleClick事件使得控件关闭然后传值，就这么简单！可是发现微软既然没有提供MonthCalendar中DoubleClick事件，原因不知为何，但问题必须解决，没办法，只能亲手扩展了！
下面就与大家一起分享解决方法！其中参考国外网的一些代码！
首先需要新建一个自定义控件继承MonthCalendar
其中重写几个重要的方法如OnMouseDown和OnDoubleClick方法即可
代码区域
    public partial class Cldar : MonthCalendar
    {
        private Point m_LastClickPosition;
        private long m_LastClickTime;
        private Boolean m_LastClickRaisedDoubleClick;

        public Cldar()
        {
            InitializeComponent();
        }

        protected override void OnPaint(PaintEventArgs pe)
        {
            // TODO: Add custom paint code here

            // Calling the base class OnPaint
            base.OnPaint(pe);
        }

        /**//// <summary>
        /// ModeChanged Event.
        /// </summary>
        [Browsable(true)]
        [Category("Basic_Event"), Description("觸發MonthCalendar雙擊時的事件.")]
        public event EventHandler DoubleClick;

        protected override void OnDoubleClick(EventArgs e)
        {
            DoubleClick(this, e);
            base.OnDoubleClick(e);
        }

        bool IsInDoubleClickArea(Point Point1, Point Point2)
        {
            return Math.Abs(Point1.X - Point2.X) <= SystemInformation.DoubleClickSize.Width &&
            Math.Abs(Point1.Y - Point2.Y) <= SystemInformation.DoubleClickSize.Height;
        }

        protected override void OnMouseDown(MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (!m_LastClickRaisedDoubleClick && System.DateTime.Now.Ticks - m_LastClickTime <= SystemInformation.DoubleClickTime * 10000 && IsInDoubleClickArea(m_LastClickPosition, Cursor.Position))
                {
                    OnDoubleClick(EventArgs.Empty);
                    m_LastClickRaisedDoubleClick = true;
                }
                else
                {
                    m_LastClickRaisedDoubleClick = false;
                }
                m_LastClickPosition = Cursor.Position;
                m_LastClickTime = System.DateTime.Now.Ticks;

            }
            base.OnMouseDown(e);
        }
    }