当列表太长时，列表框中的数据模板内的容器为空

发布于 2024-10-05 04:45:26 字数 978 浏览 5 评论 0原文

我有一个列表框，其中包含一个数据模板，其中包含 Image 和 TextBlock 控件。我想通过首先获取网格容器来获取 ImageControl

<ListBox x:Name="NewsList" Margin="0,0,20,0" SelectionChanged="NewsList_SelectionChanged" />    
<DataTemplate>
            <Grid Width="400" Height="89">
            <Image HorizontalAlignment="Left" Width="64" x:Name="ImageThumbnail" Height="64" VerticalAlignment="Top" Margin="0,10,0,0" Source="http://vnexpress.net/Files/Subject/3B/A2/3B/15/top.jpg"/>
                <TextBlock Text="{Binding Title}" Margin="78,0,8,0" TextWrapping="Wrap" FontSize="26.667" Height="74" VerticalAlignment="Top"/>
            </Grid>
        </DataTemplate>
</ListBox>
for (int i = 0; i < feeds.Count; i++)
    var containerItem = list.ItemContainerGenerator.ContainerFromIndex(i);

当我设置 NewsList.Items = Feeds 且 feeds.Count 大于 23 时，某些 containerItem 为空。如果它小于 23，我永远不会得到空容器。

有谁知道原因是什么以及如何解决它。如果我们可以有另一种方法来获取 imageControl

原文

I have a listbox contains a datatemplate with Image and TextBlock control inside. I want to get the ImageControl out by first getting the Grid Container

<ListBox x:Name="NewsList" Margin="0,0,20,0" SelectionChanged="NewsList_SelectionChanged" />    
<DataTemplate>
            <Grid Width="400" Height="89">
            <Image HorizontalAlignment="Left" Width="64" x:Name="ImageThumbnail" Height="64" VerticalAlignment="Top" Margin="0,10,0,0" Source="http://vnexpress.net/Files/Subject/3B/A2/3B/15/top.jpg"/>
                <TextBlock Text="{Binding Title}" Margin="78,0,8,0" TextWrapping="Wrap" FontSize="26.667" Height="74" VerticalAlignment="Top"/>
            </Grid>
        </DataTemplate>
</ListBox>
for (int i = 0; i < feeds.Count; i++)
    var containerItem = list.ItemContainerGenerator.ContainerFromIndex(i);

And when I set the NewsList.Items = Feeds with feeds.Count is more than 23, some of the containerItem is null. If it is less than 23, I never get a null container.

Does anyone know what is the cause and how I can fix it. If we can have another way to get the imageControl out

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病女 2024-10-12 04:45:26

我看到的一件事是你的 xaml 对我来说看起来不正确。

它不应该像这样吗：

<ListBox x:Name="NewsList" Margin="0,0,20,0" SelectionChanged="NewsList_SelectionChanged">
  <ListBox.ItemTemplate>
    <DataTemplate>
        <Grid Width="400" Height="89">
        <Image HorizontalAlignment="Left" Width="64" x:Name="ImageThumbnail" Height="64" VerticalAlignment="Top" Margin="0,10,0,0" Source="http://vnexpress.net/Files/Subject/3B/A2/3B/15/top.jpg"/>
            <TextBlock Text="{Binding Title}" Margin="78,0,8,0" TextWrapping="Wrap" FontSize="26.667" Height="74" VerticalAlignment="Top"/>
        </Grid>
    </DataTemplate>
  </ListBox.ItemTemplate>
</ListBox>

除此之外，我不确定这是否会对您有帮助。

One thing I can see is that your xaml doesn't look right to me.

Shouldn't it look like this:

<ListBox x:Name="NewsList" Margin="0,0,20,0" SelectionChanged="NewsList_SelectionChanged">
  <ListBox.ItemTemplate>
    <DataTemplate>
        <Grid Width="400" Height="89">
        <Image HorizontalAlignment="Left" Width="64" x:Name="ImageThumbnail" Height="64" VerticalAlignment="Top" Margin="0,10,0,0" Source="http://vnexpress.net/Files/Subject/3B/A2/3B/15/top.jpg"/>
            <TextBlock Text="{Binding Title}" Margin="78,0,8,0" TextWrapping="Wrap" FontSize="26.667" Height="74" VerticalAlignment="Top"/>
        </Grid>
    </DataTemplate>
  </ListBox.ItemTemplate>
</ListBox>

Beyond that I'm not sure if that will totally help you or not.

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