從MainWindow更新屬性到userControl

我有在MainWindow「ZoomSlider」中定義的屬性，即數據綁定到Slider。從MainWindow更新屬性到userControl

在UserControl我有一個Ellipse，使其高度限制爲Slider值。

主窗口代碼

<Slider 
    Grid.Column="4" 
    Value="{Binding ElementName=MainWindow,Path=ZoomSlider,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged,NotifyOnSourceUpdated=True}" 
    Maximum="46" 
    Minimum=".1" 
    LargeChange=".1" 
    Ticks="0,1,5" 
    TickPlacement="BottomRight" 
    SmallChange=".1" 
    Height="22" 
    Width="75" 
    Margin="0" 
    HorizontalAlignment="Right" 
    VerticalAlignment="Bottom"> 
</Slider> 

<!--Content Control is the Host of a userControl which iam Setting dynamically at runtime--> 

<ContentControl Name="content" BorderThickness="1" 

Content="{Binding CurrentViewModel,Mode=TwoWay, 
UpdateSourceTrigger=PropertyChanged,NotifyOnSourceUpdated=True}">  

</ContentControl>

用戶控件代碼

<Ellipse Stroke="Black"> 
    <Ellipse.Height> 
     <MultiBinding Converter="{StaticResource zoomConverter}" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" NotifyOnSourceUpdated="True"> 

      <Binding Path="Dia" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" NotifyOnSourceUpdated="True"/> 

      <Binding RelativeSource="{RelativeSource FindAncestor,AncestorType={x:Type Window}}" Path="ZoomSlider" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" 
     NotifyOnSourceUpdated="True" PresentationTraceSources.TraceLevel="High"/> 

     </MultiBinding>

主窗口C＃代碼

private double zoomSlider = 2; 

public double ZoomSlider 
{ 
    get { return zoomSlider; } 
    set 
    { 
     zoomSlider = value; 
     NotifyPropertyChanged("ZoomSlider"); 
    } 
}

我成功地獲取默認滑塊值在UserControl，但是當Slider的價值屬性更改其是沒有得到體現在UserControl。

因此，底線如何更新滑塊值到達UserControlEllipse

注：

UserControl綁定到用戶控件視圖模型，所以是主窗口到窗口視圖模型

任何幫助感謝！

來源

2014-02-19 Abhinav Sharma

在此放置的轉換器'<綁定的RelativeSource = 「{的RelativeSource FindAncestor，AncestorType = {X：類型窗口}}」路徑=「ZoomSlider 「Mode =」TwoWay「UpdateSourceTrigger =」PropertyChanged「 NotifyOnSourceUpdated =」True「PresentationTraceSources.TraceLevel =」High「/>'並檢查... – Sankarann

ZoomSlider應該有一個DependencyProperty作爲後備字段以啓用結合

public double ZoomSlider 
{ 
    get { return (double)GetValue(ZoomSliderProperty); } 
    set { SetValue(ZoomSliderProperty, value); } 
} 

// Using a DependencyProperty as the backing store for ZoomSlider. This enables animation, styling, binding, etc... 
public static readonly DependencyProperty ZoomSliderProperty = 
      DependencyProperty.Register("ZoomSlider", typeof(double), typeof(MainWindow), new PropertyMetadata(2d));

來源

2014-02-19 10:44:52 Dtex

感謝您的好友，您使我的一天.... –

從MainWindow更新屬性到userControl

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