WPF 自定義的依賴屬性要想在介面上能立即看到屬性變化的值。必須實現回撥通知

下面以最近剛自定義的RadioButton為例

public class RadioButton360 : RadioButton
    {
        public static readonly DependencyProperty CheckedColorProperty = DependencyProperty.Register("CheckedColor", typeof(Brush), typeof(RadioButton360), new PropertyMetadata(Brushes.White, PropertyChanged));
        public static readonly DependencyProperty UnCheckedColorProperty = DependencyProperty.Register("UnCheckedColor", typeof(Brush), typeof(RadioButton360), new PropertyMetadata(Brushes.Transparent, PropertyChanged));
        public static readonly DependencyProperty MouseOverColorProperty = DependencyProperty.Register("MouseOverColor", typeof(Brush), typeof(RadioButton360), new PropertyMetadata(Brushes.LightGray, PropertyChanged));

        /// <summary>
        /// 選中顏色
        /// </summary>
        public Brush CheckedColor
        {
            get { return (Brush)GetValue(CheckedColorProperty); }
            set { SetValue(CheckedColorProperty, value); }
        }

        /// <summary>
        /// 未選中顏色
        /// </summary>
        public Brush UnCheckedColor
        {
            get { return (Brush)GetValue(UnCheckedColorProperty); }
            set { SetValue(UnCheckedColorProperty, value); }
        }

        /// <summary>
        /// 滑鼠移動顏色
        /// </summary>
        public Brush MouseOverColor
        {
            get { return (Brush)GetValue(MouseOverColorProperty); }
            set { SetValue(MouseOverColorProperty, value); }
        }

        public RadioButton360()
        {
            try
            {
                this.Resources.Source = new Uri("DialogEx;Component/Controls/RadioButton360.xaml", UriKind.RelativeOrAbsolute);
            }
            catch
            {
                throw new Exception("未找到:DialogEx;Component/Controls/RadioButton360.xaml");
            }
        }
        private static void PropertyChanged(DependencyObject dobj, DependencyPropertyChangedEventArgs e)
        {
            RadioButton360 control = (RadioButton360)dobj;
            control.Resources["CheckedColor"] = control.CheckedColor;
            control.Resources["UnCheckedColor"] = control.UnCheckedColor;
            control.Resources["MouseOverColor"] = control.MouseOverColor;
            control.Style = control.Resources["RadioButtonStyle"] as Style;
            //String.Format("PropertyChanged - 屬性：{0} 新值：{1} 舊值：{2}", e.Property.Name, e.NewValue, e.OldValue);
        }
 

我們回撥至這個函式就能達到效果。結果將會介面上實時顯示

經過測試！上面這種方法不安全。不知道什麼問題造成的。初始值經常會覆蓋設定的值。不知道有沒有人有辦法徹底解決。