EventHandle

一、定义一个事件委托（EventHandler）

class Event
    {
        public static event EventHandler RemainChage;
    }

二、定义一个属性和方法，该方法实现属性值的输出

 class Event
    {
        public static event EventHandler RemainChage;

        private static int remainTime = -1;
        public static int RemainTime
        {
            get { return remainTime; }
            set
            {
                remainTime = value;
            }
        }

        public static void ShowRemainTime(object sender, EventArgs e)
        {
            Console.WriteLine(RemainTime);
        }

    }

三、将定义好的事件委托和方法进行绑定，其作用是当运行事件委托时就会执行该方法

  class Event
    {
        public static event EventHandler RemainChage;

        private static int remainTime = -1;
        public static int RemainTime
        {
            get { return remainTime; }
            set
            {
                remainTime = value;
            }
        }

        public static void ShowRemainTime(object sender, EventArgs e)
        {
            Console.WriteLine(RemainTime);
        }

        public static void InitEventHandle()
        {
            RemainChage += ShowRemainTime;
        }

    }

四、修改属性实现当给属性赋值的时候触发事件委托

   class Event
    {
        public static event EventHandler RemainChage;

        private static int remainTime = -1;
        public static int RemainTime
        {
            get { return remainTime; }
            set
            {
                remainTime = value;
                RemainChage?.Invoke(new object(), new EventArgs());
            }
        }

        public static void ShowRemainTime(object sender, EventArgs e)
        {
            Console.WriteLine(RemainTime);
        }

        public static void InitEventHandle()
        {
            RemainChage += ShowRemainTime;
        }

    }

五、调用事件委托和方法的绑定方法实现绑定

 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Event.InitEventHandle();
        }

    }

六、在按钮单机事件中修改属性值

 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Event.InitEventHandle();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (Event.RemainTime < 60)
                Event.RemainTime++;
        }
    }

七、结果显示