本文介绍了在代码隐藏中的 DataTemplate 中查找 WPF 元素的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个数据模板
<Window.Resources>
<DataTemplate x:Key="BarChartItemsTemplate">
<Border Width="385" Height="50">
<Grid>
<Rectangle Name="rectangleBarChart" Fill="MediumOrchid" StrokeThickness="2" Height="40" Width="{Binding}" HorizontalAlignment="Right" VerticalAlignment="Bottom">
<Rectangle.LayoutTransform>
<ScaleTransform ScaleX="4"/>
</Rectangle.LayoutTransform>
</Rectangle>
<TextBlock Margin="14" FontWeight="Bold" HorizontalAlignment="Right" VerticalAlignment="Center" Text="{Binding}">
<TextBlock.LayoutTransform>
<TransformGroup>
<RotateTransform Angle="90"/>
<ScaleTransform ScaleX="-1" ScaleY="1"/>
</TransformGroup>
</TextBlock.LayoutTransform>
</TextBlock>
</Grid>
</Border>
</DataTemplate>
</Window.Resources>
我在表单上有一个按钮.我需要更改 dataTemplate 中的矩形的 scale(scaleTransform).我应该如何访问上述按钮的 Button_Click 事件中的 'rectangleBarChart' 元素?
I have a button on the form. I need to change the scale(scaleTransform) the rectangle from the dataTemplate. How am I supposed to access the 'rectangleBarChart' element in the Button_Click event of the above mentioned button ?
推荐答案
我在我的 WPF 程序中经常使用这个函数来查找子元素:
I use this function a lot in my WPF programs to find children elements:
public IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
{
if (depObj != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
if (child != null && child is T)
yield return (T)child;
foreach (T childOfChild in FindVisualChildren<T>(child))
yield return childOfChild;
}
}
}
用法:
foreach (var rectangle in FindVisualChildren<Rectangle>(this))
{
if (rectangle.Name == "rectangleBarChart")
{
/* Your code here */
}
}
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