WPF 自定义控件依赖属性怎么实时变化？

来源：互联网发布：南京军区网络电视台编辑：程序博客网时间：2024/05/06 04:49

WPF 自定义的依赖属性要想在界面上能立即看到属性变化的值。必须实现回调通知

下面以最近刚自定义的RadioButton为例

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>        /// 选中颜色        /// </summary>        public Brush CheckedColor        {            get { return (Brush)GetValue(CheckedColorProperty); }            set { SetValue(CheckedColorProperty, value); }        }        /// <summary>        /// 未选中颜色        /// </summary>        public Brush UnCheckedColor        {            get { return (Brush)GetValue(UnCheckedColorProperty); }            set { SetValue(UnCheckedColorProperty, value); }        }        /// <summary>        /// 鼠标移动颜色        /// </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 - 属性：{0} 新值：{1} 旧值：{2}", e.Property.Name, e.NewValue, e.OldValue);        }

PropertyChanged 这个函数就是用来在通知之后执行的。这样我们可以在自定义控件初始化的时候加载资源，当依赖属性发生变化时，会触发事件，

我们回调至这个函数就能达到效果。结果将会界面上实时显示

经过测试！上面这种方法不安全。不知道什么问题造成的。初始值经常会覆盖设置的值。不知道有没有人有办法彻底解决。

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