WPF 依赖附加属性
Posted 江宁织造
tags:
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附加属性的本质是一个依赖属性,与普通的依赖属性区别:
1:注册方法名不一样,如 DependencyProperty.RegisterAttached
2:没有普通的属性包装器,而是通过get和set属性来实现属性包装
3:没有普通的.NET属性
public static readonly DependencyProperty KeepAliveProperty = DependencyProperty.Register(
"KeepAlive",
typeof(bool),
typeof(Window),
new PropertyMetadata(KeepAliveChanged));
/// <summary> /// 获取一个值,该值指示是否在现代化框架实例中保持指定对象的活动状态/// </summary> /// <param name="o">The target dependency object.</param> /// <returns>Whether to keep the object alive. Null to leave the decision to the ModernFrame.</returns> public static bool? GetKeepAlive(DependencyObject o) { if (o == null) { throw new ArgumentNullException("o"); } return (bool?)o.GetValue(KeepAliveProperty); } /// <summary> /// 设置一个值,该值指示是否在现代化框架实例中保持指定对象的活动状态/// </summary> /// <param name="o">The target dependency object.</param> /// <param name="value">Whether to keep the object alive. Null to leave the decision to the ModernFrame.</param> public static void SetKeepAlive(DependencyObject o, bool? value) { if (o == null) { throw new ArgumentNullException("o"); } o.SetValue(KeepAliveProperty, value); }
private static void KeepAliveChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var window = d as Window; if (window != null) { window.DialogResult = e.NewValue as bool?; } }
用法:
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