是否可以在代码中访问DataTemplate中的项目？

发布于 2024-10-02 07:15:01 字数 820 浏览 3 评论 0原文

是否可以在代码中访问DataTemplate中的项目？我的意思是，我在 Window.Resources 中定义了 DataTemplate，如下所示：

<Window.Resources>
    <DataTemplate x:Key="MyTemplate" DataType="MyType">
        <StackPanel Orientation="Horizontal" Height="Auto" Tag="ColorString">
            <Rectangle Width="16" Height="14" Margin="2,1" VerticalAlignment="Center" Stroke="Red">
                <Rectangle.Fill>
                    <SolidColorBrush Color="{Binding Path=FillColor}"/>
                </Rectangle.Fill>
            </Rectangle>
            <TextBlock VerticalAlignment="Center" Text="{Binding Path=Value}"/>
        </StackPanel>
    </DataTemplate>
</Window.Resources>

我需要在代码中设置 Rectangle 的一些属性。我该怎么做？当 DataTemplate 加载时，其 VisualTree 为 null。

原文

Is it possible to access items in DataTemplate in the code? I mean, I have DataTemplate defined in Window.Resources like this:

<Window.Resources>
    <DataTemplate x:Key="MyTemplate" DataType="MyType">
        <StackPanel Orientation="Horizontal" Height="Auto" Tag="ColorString">
            <Rectangle Width="16" Height="14" Margin="2,1" VerticalAlignment="Center" Stroke="Red">
                <Rectangle.Fill>
                    <SolidColorBrush Color="{Binding Path=FillColor}"/>
                </Rectangle.Fill>
            </Rectangle>
            <TextBlock VerticalAlignment="Center" Text="{Binding Path=Value}"/>
        </StackPanel>
    </DataTemplate>
</Window.Resources>

I need to set some properties of the Rectangle in the code. How can I do this? When DataTemplate is loaded its VisualTree is null.

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

回心转意 2024-10-09 07:15:01

您可以将 Loaded 事件添加到 StackPanel 和后面的代码中。

private void StackPanel_Loaded(object sender, RoutedEventArgs e)
{
    StackPanel stackPanel = sender as StackPanel;
    Rectangle rectangle = GetVisualChild<Rectangle>(stackPanel) as Rectangle;
    //..
}

这不会影响 DataTemplate 本身，但每次使用它时，都会调用 StackPanel_Loaded。

GetVisualChild 的实现..

public static T GetVisualChild<T>(object parent) where T : Visual
{
    DependencyObject dependencyObject = parent as DependencyObject;
    return InternalGetVisualChild<T>(dependencyObject);
}
private static T InternalGetVisualChild<T>(DependencyObject parent) where T : Visual
{
    T child = default(T);
    int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < numVisuals; i++)
    {
        Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
        child = v as T;
        if (child == null)
        {
            child = GetVisualChild<T>(v);
        }
        if (child != null)
        {
            break;
        }
    }
    return child;
}

You can add the Loaded event to the StackPanel and in code behind.

private void StackPanel_Loaded(object sender, RoutedEventArgs e)
{
    StackPanel stackPanel = sender as StackPanel;
    Rectangle rectangle = GetVisualChild<Rectangle>(stackPanel) as Rectangle;
    //..
}

This will not affect the DataTemplate itself but everytime it is used, StackPanel_Loaded will be called.

An implementation of GetVisualChild..

public static T GetVisualChild<T>(object parent) where T : Visual
{
    DependencyObject dependencyObject = parent as DependencyObject;
    return InternalGetVisualChild<T>(dependencyObject);
}
private static T InternalGetVisualChild<T>(DependencyObject parent) where T : Visual
{
    T child = default(T);
    int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < numVisuals; i++)
    {
        Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
        child = v as T;
        if (child == null)
        {
            child = GetVisualChild<T>(v);
        }
        if (child != null)
        {
            break;
        }
    }
    return child;
}

回复收藏 0 原文

~没有更多了~