解答：

感谢彼得为其他人解决这个问题：这里是the solution with online demo and downloadable code。

<UserControl x:Class="Second12.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:basics="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
    Width="300" Height="200">
    <Grid Background="Tan">
        <StackPanel>
            <Canvas>
                <Border Background="#2200ffff" 
            Canvas.Left="40" 
            Canvas.Top="30" 
            CornerRadius="5" 
            BorderBrush="Brown"
            BorderThickness="1">
                    <Rectangle 
            Height="{Binding ElementName=theSlider, Path=Value}"
            Width="50"/>
                </Border>
            </Canvas>
        </StackPanel>
        <Slider Name="theSlider" HorizontalAlignment="Left" Width="200" Cursor="Hand"/>
    </Grid>
</UserControl>

Answer 1

Silverlight 2中支持当前绑定。This MSDN documentation article对于Silverlight当前和当前未提供的WPF功能的细节非常简洁。

在此期间你必须使用某种中间属性，这是一个完整的例子：

Page.xaml：

<UserControl x:Class="SilverlightApplication1.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Width="400" Height="300">

    <StackPanel x:Name="LayoutRoot" Background="AliceBlue">

        <Slider x:Name="Slider1" Minimum="10" SmallChange="10"
                LargeChange="20" Maximum="100"
                Value="{Binding HelperValue, Mode=TwoWay}" Cursor="Hand"/>

        <Rectangle x:Name="Rectangle1" Fill="Red"
                Height="{Binding HelperValue, Mode=OneWay}" Width="100" />

    </StackPanel>

</UserControl>

Page.xaml.cs：

using System;
using System.ComponentModel;
using System.Windows.Controls;

namespace SilverlightApplication1
{
    public partial class Page : UserControl
    {
        BindingConduit<double> sliderToRect = new BindingConduit<double>(50.0);

        public Page()
        {
            InitializeComponent();

            LayoutRoot.DataContext = sliderToRect;
        }
    }

    public class BindingConduit<T> : INotifyPropertyChanged where T : struct
    {
        private T helperValue;

        public T HelperValue
        {
            get { return this.helperValue; }
            set
            {
                if ((this.helperValue.Equals(value) != true))
                {
                    this.helperValue = value;
                    this.RaisePropertyChanged("HelperValue");
                }
            }
        }

        public BindingConduit(T defaultValue)
        {
            HelperValue = defaultValue;
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected void RaisePropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler propertyChanged = this.PropertyChanged;

            if (propertyChanged != null)
            {
                propertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}

Slider的Value属性绑定到HelperValue并设置为TwoWay，Rectangle的Height绑定到同一属性但只需要OneWay。

正在从BindingConduit＆lt; T＆gt;的实例中读取HelperValue属性。在Page中创建的类名为sliderToRect。此实例设置为父StackPanel控件的DataContext。 Slider1的Value属性中的任何更改都会反映在Rectangle1的高度中，因为HelperValue属性会引发PropertyChanged事件。

BindingConduit＆LT; T＆GT;是我创建的实现INotifyPropertyChanged的自定义类，还允许您为HelperValue指定默认值（即Slider1的初始值和Rectangle1的高度（50.0））。

如何在Silverlight中将Slider值绑定到Rectangle高度（在WPF中工作）？

解答：

1 个答案: