如何从WPF工具提示中生孩子

Question

我有这样的代码

<Setter Property="ToolTip" >
   <Setter.Value>
      <ToolTip>
         <StackPanel>
            <TextBlock Text="Assignment Name : " FontSize="18">
            <TextBlock Name="asn" FontSize="18" Foreground="GreenYellow" Text="nothing here"/> 
            </TextBlock>
         </StackPanel>
      </ToolTip>
   </Setter.Value>
</Setter>
<EventSetter Event="ToolTipOpening" Handler="ToolTip_Opening"/>

我想获取名称为asn的文本块，以从中获取文本属性。

这可能吗 ？

编辑1：如果我想对名称为：asn的文本块使用绑定

到图像源

即：在asn文本块中显示image source属性

（文本块放置在具有图像子级的自定义控件上）

<Style TargetType="Controls:Tile">
     ...
        <Setter Property="ToolTip" >
         <Setter.Value>
           <ToolTip>
               <StackPanel> 
                   <TextBlock Text="Assignment Name : " FontSize="18">       
                         <TextBlock Name="asn" FontSize="18" Foreground="GreenYellow" Text="nothing here"/> 
                    </TextBlock>
                </StackPanel>
           </ToolTip>
        </Setter.Value>
   </Setter>
    <EventSetter Event="ToolTipOpening" Handler="ToolTip_Opening"/>
  </Style>

Answer 1

您需要遍历PlacementTarget来找到TextBlock，因为工具提示与TextBlock不在同一个可视树中。

非常相似： 来自ToolTip或ContextMenu的RelativeSource绑定

Answer 2

您能否不使用x：Name命名Image控件然后绑定到它？

例如

<Image x:Name="MyImage" Source="Stuff"/>
<TextBlock Text="{Binding ElementName=MyImage, Path=Source}"/>

Answer 3

好了，感谢@John Gardner解决了这个问题

解决方案很简单

<TextBlock  FontSize="18" Foreground="DarkGreen" Text="{Binding IsAsync=True, Path=PlacementTarget,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=ToolTip},Converter={StaticResource myconvertortool}}"/>

这会将自定义控件实例传递给转换器，该转换器仅从中获取图像

   Public Class ToolTipToSourceConverter
    Implements IValueConverter

    Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.Convert
        If value Is Nothing Then
            Return "Error "
        End If
        Try
            Dim sndr = DirectCast(value, MahApps.Metro.Controls.Tile)
            Dim sndrimage = DirectCast(sndr.GetChildObjects(False)(0), Image)
            Dim imgname As String = sndrimage.Source.ToString.Substring(sndrimage.Source.ToString.LastIndexOf("/"c) + 1)


            Return StatsDict.InquireForAssignment(imgname).Name.ToString.Replace("_", " ")
        Catch ex As Exception
            Return value.GetType.ToString
        End Try
        'if is connected to master True then hide
    End Function

    Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
        Throw New NotImplementedException
    End Function
End Class