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INotifyPropertyChanged通知,mvvm更新数据.

在WPF MVVM模式开发中，使用他可以通知数据更新

1. 定义一个NotifyBase工具类,继承INotifyPropertyChanged

   public class NotifyBase : INotifyPropertyChanged
   {
       public event PropertyChangedEventHandler PropertyChanged;
   
       public void DoNotify([CallerMemberName] string name = "")
       {
           PropertyChanged?.Invoke(this,new PropertyChangedEventArgs(name));
       }
   }

   2. 在绑定的Model中继承定义好的NotifyBase

    public class SongModel : NotifyBase
    {
        /// <summary>
        /// 歌曲url
        /// </summary>
        private string _songUrl;
        public string SongUrl
        {
            get { return this._songUrl; }
            set
            {
                _songUrl = value;
                DoNotify();
            }
        }
   
        /// <summary>
        /// 本地下载后的mp3路径
        /// </summary>
        private string _localSongUrl;
        public string LocalSongUrl
        {
            get { return this._localSongUrl; }
            set
            {
                _localSongUrl = value;
                DoNotify();
            }
        }
   
        /// <summary>
        /// 歌曲图片
        /// </summary>
        private string _picUrl;
        public string PicUrl
        {
            get { return this._picUrl; }
            set
            {
                _picUrl = value;
                DoNotify();
            }
        }
   
   
    }