C# 在代码隐藏中的 DataTemplate 中查找 WPF 元素
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Find a WPF element inside DataTemplate in the code-behind
提问by Robert Langdon
I have a data-template
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>
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 ?
我在表格上有一个按钮。我需要从 dataTemplate 更改矩形的比例（scaleTransform）。我应该如何访问上述按钮的 Button_Click 事件中的 'rectangleBarChart' 元素？
采纳答案by Mark Oreta
I use this function a lot in my WPF programs to find children elements:
我在 WPF 程序中经常使用这个函数来查找子元素：
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;
}
}
}
Usage:
用法：
foreach (var rectangle in FindVisualChildren<Rectangle>(this))
{
if (rectangle.Name == "rectangleBarChart")
{
/* Your code here */
}
}
回答by H.B.
Do notdo it. If you need to change something in a DataTemplatethen bind the respective properties and modify the underlying data. Also i would recommend binding the Button.Commandto an ICommandon your data/view-model (see MVVM) instead of using events, then you are in the right context already and the view does not need to do anything.
千万不能这样做。如果您需要在 a 中更改某些内容，DataTemplate则绑定相应的属性并修改基础数据。此外，我建议将 绑定Button.Command到ICommand您的数据/视图模型（请参阅 MVVM）而不是使用事件，然后您已经处于正确的上下文中并且视图不需要执行任何操作。
