相关源FindAncestor WPF 4& amp; Silverlight 5 [英] RelativeSource FindAncestor Differences in WPF 4 & Silverlight 5

问题描述

 <   TextBox     Horizo​​ntalAlignment   = 左   高度  =  23    TextWrapping   = 换行   正文  =  TextBox1    VerticalAlignment   =  Top   宽度  =  120 >  
 <   interactiveness：Interaction.Triggers  >  
 <   interactive：EventTrigger     EventName   =  GotFocus >  
 <   interactive：InvokeCommandAction    命令  =  {Binding GotFocusCommand}    CommandParameter   =  {Binding RelativeSource = {RelativeSource FindAncestor，AncestorType = TextBox}}    /  >  
 <   / interactive：EventTrigger  >  
 <   / interactive：Interaction.Triggers  >  
 <   / TextBox  >  

在WPF 4中，CommandParameter正确设置为聚焦文本框。但是在SL5中，CommandParameter被设置为null。



但以下工作在WPF 4& SL5：

 <   TextBox     Horizo​​ntalAlignment   = 左   高度  =  23    TextWrapping   = 换行   文字  =  TextBox1    VerticalAlignment   =  Top   宽度  =  120 >  
 <   interactive：Interaction.Triggers   >  
 <   interactive：EventTrigger     EventName   =  GotFocus  >  
 <  交互性：InvokeCommandAction    命令  =  {Binding GotFocusCommand}    CommandParameter   =  {Binding Path = Children [0]，RelativeSource = {RelativeSource FindAncestor，AncestorType = StackPanel}}    /  >  
 <   / interactive：EventTrigger  >  
 <   / interactivity：Interaction.Triggers  >  
 <   / TextBox  > ;  

我更喜欢第一种方法我想把它放在一个风格和将它应用于TextBox-es跨应用程序中的许多xaml-s。

解决方案

Hi Padmanabhan，Silverlight不支持AncestorType。或者，您可以使用附加属性来模拟缺少的功能。



请访问此链接 [ ^ ];）



问候。

<TextBox HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="TextBox1" VerticalAlignment="Top" Width="120">
                <interactivity:Interaction.Triggers>
                    <interactivity:EventTrigger EventName="GotFocus">
                        <interactivity:InvokeCommandAction Command="{Binding GotFocusCommand}" CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=TextBox}}" />
                    </interactivity:EventTrigger>
                </interactivity:Interaction.Triggers>
            </TextBox>

In WPF 4, the CommandParameter is correctly set to the focused Textbox. But in SL5, the CommandParameter is set to null.

But the following works in both WPF 4 & SL5:

<TextBox HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="TextBox1" VerticalAlignment="Top" Width="120">
    <interactivity:Interaction.Triggers>
        <interactivity:EventTrigger EventName="GotFocus">
            <interactivity:InvokeCommandAction Command="{Binding GotFocusCommand}" CommandParameter="{Binding Path=Children[0], RelativeSource={RelativeSource FindAncestor, AncestorType=StackPanel}}" />
        </interactivity:EventTrigger>
    </interactivity:Interaction.Triggers>
</TextBox>

I prefer the first method as I want to put this in a style & apply it to TextBox-es across many xaml-s in an application.

解决方案

Hi Padmanabhan, AncestorType isn't supported by Silverlight. Alternatively you can use Attached Properties to simulate that missing functionality.

Please visit this link[^] ;)

Regards.

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