WPF属性绑定测试（索引器方式）

小结：

  如果属性绑定路径上的任何可通知变化属性发生改变，其路径及以下路径都视为发生了变化，不管是否是可通知变化属性，都会重新绑定新值。看来微软对于绑定的机制是下了功夫的，如果采用简单的反射，路径寻找的方式，如果页面元素比较多，层次比较多，效率肯定有问题的，看来有时间得反编译，看看他们是如何搞的。下面是测试代码

1）VVM

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.ComponentModel;

namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            this.DataContext = new VMDDD();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            ((VMDDD)(this.DataContext)).SetVisible2(false);
        }

        private void button7_Click(object sender, RoutedEventArgs e)
        {
            ((VMDDD)(this.DataContext)).SetVisible(true);
        }
    }

    public class VMDDD : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected void RaisePropertyChanged(string PropertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
            }
        }
        Dictionary<string, CTRL> _Props = new Dictionary<string, CTRL>();
        public Dictionary<string, CTRL> Props
        {
            get
            {
                return _Props;
            }
            set
            {
                _Props = value;
                RaisePropertyChanged("Props");
            }
        }
        public VMDDD()
        {
            _Props.Add("button1", new CTRL() { Name = "hello" });
        }
        public void SetVisible(bool visible)
        {
            //改变属性
            this.Props["button1"].Name = "Albert";
            this.Props["button1"].Visible = visible ? Visibility.Visible : Visibility.Collapsed;
        }
        public void SetVisible2(bool visible)
        {
            //改变更浅处属性
            Dictionary<string, CTRL> theProps = new Dictionary<string, CTRL>();
            theProps.Add("button1", new CTRL() { Name = "good"+new Random().Next(1,10000).ToString() });
            theProps["button1"].Visible = visible ? Visibility.Visible : Visibility.Collapsed;
            this.Props = theProps;
        }
    }
    public class CTRL : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected void RaisePropertyChanged(string PropertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
            }
        }
        private Visibility _Visible;
        public Visibility Visible
        {
            get
            {
                return _Visible;
            }
            set
            {
                _Visible = value;
                RaisePropertyChanged("Visible");
            }
        }
        public string Name { get; set; }
    }
}

 

2）xaml

<UserControl x:Class="SilverlightApplication3.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400" xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit">

    <toolkit:DockPanel x:Name="LayoutRoot">
        <Grid Height="40" Name="grid1"  toolkit:DockPanel.Dock="Top" Visibility="{Binding Path=Props[button1].Visible,Mode=TwoWay}">
            <Button Content="Button1" Height="23" HorizontalAlignment="Left" Margin="258,11,0,0" Name="button4" VerticalAlignment="Top" Width="75" />
        </Grid>
        <Grid Height="59" Name="grid2"  toolkit:DockPanel.Dock="Top" >
            <Button Content="Button2" Height="23" HorizontalAlignment="Left" Margin="250,8,0,0" Name="button3" VerticalAlignment="Top" Width="75" />
        </Grid>
        <Grid Height="66" Name="grid3"  toolkit:DockPanel.Dock="Top" >
            <Button Content="Button3" Height="23" HorizontalAlignment="Left" Margin="6,23,0,0" Name="button2" VerticalAlignment="Top" Width="75" />
        </Grid>
        <Grid Height="24" Name="grid4"  toolkit:DockPanel.Dock="Top" VerticalAlignment="Center" UseLayoutRounding="False">
            <Button Content="{Binding Path=Props[button1].Name,Mode=TwoWay}" Height="23" HorizontalAlignment="Left" Margin="65,1,0,0" Name="button5" VerticalAlignment="Top" Width="75" />
        </Grid>
        <Grid Height="30" Name="grid5" toolkit:DockPanel.Dock="Bottom">
            <Button Content="hide" Height="23" Name="button1" Width="75" Margin="127,0,197,6" Click="button1_Click" />
            <Button Content="show" Height="23" Name="button7" Width="75" Margin="227,6,98,1" Click="button7_Click" />
        </Grid>
        <Button Content="Button5" Height="23" Name="button6" Width="75" />
    </toolkit:DockPanel>
</UserControl>