如何用InotifyPropertyChanged更新array里的一个index而不是整个array?

Question

数组有changed事件， 你可以捕获。

Answer 1

这个跟PropertyChangedEventArgs的参数没有关系.
你是不是想在PropertyChange里知道是哪个Key对应的Item有了改动?
如果是,继承一下PropertyChangeEventArgs即可 public class PropertyChangedEventArgsEx : PropertyChangedEventArgs
    {
        public PropertyChangedEventArgsEx(string propName, int key, object value)
            :base(propName)
        {
            PropKey = key;
            PropValue = value;
        }
        public int PropKey { get; private set; }
        public object PropValue { get; private set; }
    }    public class DataItemList : INotifyPropertyChanged
    {
        Dictionary<int, object> m_data = new Dictionary<int, object>();        [STAThread]
        static void Main(string[] args)
        {
            DataItemList dl = new DataItemList();
            dl.PropertyChanged += (s, e) =>
            {
                PropertyChangedEventArgsEx pce = e as PropertyChangedEventArgsEx;
                if (pce != null)
                {
                    Console.WriteLine("Name:{0},Key:{1},Value:{2}", pce.PropertyName, pce.PropKey, pce.PropValue);
                }
            };
            dl[1] = "123";
            dl[2] = "456";
            /*-------------------输出-----------------
             Name:Items,Key:1,Value:123
             Name:Items,Key:2,Value:456
             ----------------------------------------*/
        }     
        public object this[int index]
        {
            get { return m_data[index]; }
            set
                {
                    m_data[index] = value;                    if (PropertyChanged != null)
                    {
                        PropertyChangedEventArgsEx pce = new PropertyChangedEventArgsEx("Items",index,value);
                        PropertyChanged(this, pce);
                    }
                }
        }        public event PropertyChangedEventHandler PropertyChanged;
    }