[WPF]WPF中如何实现数据与表示分离。(二) —— Binding(下) 转载
在我刚刚开始接触到WPF的DependencyProperty的时候,仅仅觉得是一个很巧妙的实现,随着学习WPF的深入,也来越觉得DependencyProperty其实是WPF的核心技术点之一。
DependencyProperty和DependencyObject配合,提供了WPF中基本的数据存储、访问和通知的机制。也正是因为这两个东西的存在,使得XAML,Binding,Animation都成为可能。
让我们来看一下重新实现后的数据层。
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using System;
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using System.Windows;
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using System.Windows.Media;
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namespace ColorPicker2
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{
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public class ColorPickerData : DependencyObject
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{
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public ColorPickerData()
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{
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}
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public static DependencyProperty BackgroundProperty = DependencyProperty.Register(
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"Background",
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typeof(Brush),
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typeof(ColorPickerData),
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new PropertyMetadata(new SolidColorBrush(Colors.Black))
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);
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public static DependencyProperty RedProperty = DependencyProperty.Register(
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"Red",
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typeof(byte),
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typeof(ColorPickerData)
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);
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public static DependencyProperty GreenProperty = DependencyProperty.Register(
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"Green",
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typeof(byte),
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typeof(ColorPickerData)
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);
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public static DependencyProperty BlueProperty = DependencyProperty.Register(
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"Blue",
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typeof(byte),
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typeof(ColorPickerData)
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);
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public Brush Background
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{
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get { return (Brush)GetValue(BackgroundProperty); }
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set { SetValue(BackgroundProperty, value); }
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}
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public byte Red
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{
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get { return (byte)GetValue(RedProperty); }
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set { SetValue(RedProperty, value); }
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}
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public byte Green
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{
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get { return (byte)GetValue(GreenProperty); }
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set { SetValue(GreenProperty, value); }
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}
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public byte Blue
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{
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get { return (byte)GetValue(BlueProperty); }
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set { SetValue(BlueProperty, value); }
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}
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protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
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{
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if (e.Property.Equals(RedProperty) ||
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e.Property.Equals(GreenProperty) ||
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e.Property.Equals(BlueProperty))
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{
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this.Background = new SolidColorBrush(Color.FromRgb(this.Red, this.Green, this.Blue));
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}
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base.OnPropertyChanged(e);
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}
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}
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}
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在行12-35,我们注册了4个DependencyProperty:RedProperty, GreenProperty, BlueProperty 和 BackgroundProperty。我们也不再使用成员字段去保存这些属性的具体值。而是直接使用DependencyObject上的GetValue和SetValue方法设置和读取值。
posted on 2013-08-05 17:47 ExplorerMan 阅读(168) 评论(0) 编辑 收藏 举报