棱镜 - 跨区域数据绑定

Question

假设我有2个区域A和B.

地区A：

<Grid>
    <TextBlock Name="tba"> HAHAHA </TextBlock>
</Grid>

B区：

<Grid>
    <TextBlock Text="{Binding ElementName=tba, Path=Text}"/>
</Grid>

这不起作用。修复此问题的解决方法是什么，因此在区域B中还会显示“HAHAHA”？

Answer 1

您的视图模型可以相互通信，以通过EventAggregator建立连接。

// needs to be public if the two view models live in different assemblies
internal class ThePropertyChangedEvent : PubSubEvent<string>
{
}

internal class ViewAViewModel : BindableBase
{
    public ViewAViewModel( IEventAggregator eventAggregator )
    {
        _eventAggregator = eventAggregator;
        eventAggregator.GetEvent<ThePropertyChangedEvent>().Subscribe( x => TheProperty = x );
    }

    public string TheProperty
    {
        get { return _theProperty; }
        set
        {
            if (value == _theProperty)
                return;
            _theProperty = value;
            _eventAggregator.GetEvent<ThePropertyChangedEvent>().Publish( _theProperty );
            OnPropertyChanged();
        }
    }

    #region private
    private readonly IEventAggregator _eventAggregator;
    private string _theProperty;
    #endregion
}

... ViewBViewModel基本上是一回事（在这个简单的例子中）。