C# Windows Phone 从代码中访问 DataTemplate 中的图像控件

Question

我在 LongListSelector DataTemplate 中有一个名为“imgGameList”的图像控件，我想从代码中访问它，但我无法从代码中找到该控件。

我的 LongListSelector 和我的图像控件：

<phone:LongListSelector Name="llsGameList" ItemsSource="{Binding}" Tap="llsGameList_Tap" Margin="0,90,0,0">
    <phone:LongListSelector.ItemTemplate>
        <DataTemplate>
            <Grid>
                <Image Name="imgGameList" Margin="0,10,0,10" Stretch="Fill" HorizontalAlignment="Left" VerticalAlignment="Top" Height="200" Width="150">
                    <Image.Source>
                        <BitmapImage UriSource="{Binding BoxArtFrontThumb}"
                                 CreateOptions="BackgroundCreation" DecodePixelHeight="200" DecodePixelWidth="150" />
                    </Image.Source>
                </Image>
            </Grid>
        </DataTemplate>
    </phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>

我尝试访问图像控件的原因是因为我遇到了内存问题并希望对其应用 gleb.kudr 修复：Why do I get an OutOfMemoryException when I have images in my ListBox?

我希望有人可以帮助我。谢谢。

Answer 1

    public FrameworkElement SearchVisualTree(DependencyObject targetElement, string elementName)
    {
        FrameworkElement res = null;
        var count = VisualTreeHelper.GetChildrenCount(targetElement);
        if (count == 0)
            return res;

        for (int i = 0; i < count; i++)
        {
            var child = VisualTreeHelper.GetChild(targetElement, i);
            if ((child as FrameworkElement).Name == elementName)
            {
                res = child as FrameworkElement;
                return res;
            }
            else
            {
                res = SearchVisualTree(child, elementName);
                if (res != null)
                    return res;
            }
        }
        return res;
    }

用法：

Image image = SearchVisualTree(listItem, "imgGameList") as Image;