C# 監聽值的變化

1、寫一個監聽值變化的類

public class MonitorValueChange
    {
        private Visibility myValue;
        public Visibility MyValue
        {
            get { return myValue; }
            set
            {
                if (value != myValue)
                {
                    WhenMyValueChange();
                }
                myValue = value;
            }
        }
        //定義的委托
        public delegate void MyValueChanged(object sender, EventArgs e);
        //與委托相關聯的事件
        public event MyValueChanged OnMyValueChanged;
        //事件觸發函數
        private void WhenMyValueChange()
        {
            if (OnMyValueChanged != null)
            {
                OnMyValueChanged(this, null);

            }
        }

    }

　　2、調用該類監聽數據

MonitorValueChange change = new MonitorValueChange();
change.MyValue = Visibility.Visible;
change.OnMyValueChanged += Change_OnMyValueChanged;
change.MyValue = Visibility.Collapsed;

private void Change_OnMyValueChanged(object sender, EventArgs e)
{
   //要做的操作
}