在自定义行为上绑定依赖属性时出错

InitializeComponent

<UserControl x:Class="MyExample.MyPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:MyExample"
    >
    <Grid x:Name="LayoutRoot">
        <local:MyView/>
    </Grid>
</UserControl>

<UserControl x:Class="MyExample.MyView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
    xmlns:local="clr-namespace:MyExample"
    Width="400" Height="300">
    <StackPanel Orientation="Vertical" x:Name="LayoutRoot" Background="White">
        <StackPanel.Resources>
            <local:MyViewmodel x:Key="MyResource"/>
        </StackPanel.Resources>
        <TextBlock Text="This button will display the following message:"/>
        <TextBlock Text="{Binding MyMessage, Source={StaticResource MyResource}}" FontStyle="Italic"/>
        <Button x:Name="MyButton" Content="Click me!">
            <i:Interaction.Behaviors>
                <local:MyBehavior Message="{Binding MyMessage, Source={StaticResource MyResource}}"/>
            </i:Interaction.Behaviors>
        </Button>
    </StackPanel>
</UserControl>

现在代码有两个类:一个用于行为,另一个用于视图模型:

public class MyViewmodel
{
    public string MyMessage
    {
        get { return "Hello, world!"; }
    }
}

public class MyBehavior : Behavior<Button>
{
    public static readonly DependencyProperty MessageProperty =
        DependencyProperty.Register("Message",
        typeof(string), typeof(MyBehavior),
        new PropertyMetadata("(no message)"));

    public string Message
    {
        get { return (string)GetValue(MessageProperty); }
        set { SetValue(MessageProperty, value); }
    }

    protected override void OnAttached()
    {
        base.OnAttached();
        AssociatedObject.Click += new RoutedEventHandler(AssociatedObject_Click);
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();
        AssociatedObject.Click -= new RoutedEventHandler(AssociatedObject_Click);
    }

    void AssociatedObject_Click(object sender, RoutedEventArgs e)
    {
        MessageBox.Show(Message);
    }
}

AG_E_PARSER_BAD_PROPERTY_VALUE [Line: 15 Position: 43]

谢谢!

here

here ,这个似乎奏效了。这一次,使用的技巧是

<StackPanel.Resources>
    <local:MyViewmodel x:Key="MyResource"/>
    <local:DeepSetter 
        x:Key="MyBehaviorSetter"
        TargetProperty="Message"
        BindingExport="{Binding MyMessage, Source={StaticResource MyResource}}"/>
</StackPanel.Resources>

…并按如下方式修改按钮的行为声明:

<local:MyBehavior local:DeepSetter.BindingImport="{StaticResource MyBehaviorSetter}"/>

好消息:任何DependecyObject的数据绑定都将在Silverlight 4上可用: http://timheuer.com/blog/archive/2009/11/18/whats-new-in-silverlight-4-complete-guide-new-features.aspx#dobind