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我有有這樣綁定的高度和邊框的寬度,以它的一半兒
<UserControl
x:Class="App2.MyImageControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App2"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400">
<Grid x:Name="MyGrid" x:FieldModifier="public" ManipulationMode="None" Tapped="MyGrid_Tapped" HorizontalAlignment="Left" VerticalAlignment="Top" >
<Grid.RenderTransform>
<CompositeTransform></CompositeTransform>
</Grid.RenderTransform>
<Border x:Name="MyBorder" x:FieldModifier="public" BorderThickness="1" BorderBrush="Transparent" Width="auto" Height="auto">
<Grid>
<Image x:Name="MyImageO" x:FieldModifier="public" Source="" Width="auto" Height="auto" Stretch="Fill"></Image>
</Grid>
</Border>
</Grid>
我想MyBorder寬度和高度綁定到元素的用戶控件MyImageO寬度和高度在運行時的一半。我該如何實現這一點。