WPF ListBox 未使用 ItemsSource 更新

问题描述

我认为在 WPF 设置中应该是简单的双向数据绑定，但列表框(目标)没有随着集合的变化而更新.

I have what I believe should be simple two-way databinding in WPF setup, but the listbox (target) is not updating as the collection changes.

我正在以编程方式设置 ListBox 的 ItemsSource:

I'm setting this ItemsSource of the ListBox programmatically:

lstVariable_Selected.ItemsSource = m_VariableList;

ListBox声明如下:

And the ListBox is declared as follows:

<ListBox Margin="5" Name="lstVariable_Selected">
    <ListBox.ItemsPanel>
       <ItemsPanelTemplate>
          <VirtualizingStackPanel Orientation="Horizontal"/>
       </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
    <ListBox.ItemTemplate>
       <DataTemplate>
            <Border BorderBrush="Gray" BorderThickness="1" Margin="0">
                <TextBlock FontSize="25" Text="{Binding Path=Name}" />
            </Border>
       </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

当我最初设置 ItemsSource 时，ListBox(当时不可见)设置了它的项目.但是，如果我查看 ListBox，更新似乎会停止.

When I initially set the ItemsSource, the ListBox (which is not visible at the time) gets its items set. However, if I go view the ListBox, updates seem to stop at that point.

然后我可以从 m_VariableList 集合中删除一个项目，并且它不会从 ListBox 中消失.同样，如果我添加一个，它不会出现.

I can then remove an item from the m_VariableList collection, and it does not disappear from the ListBox. Likewise, if I add one, it doesn't appear.

什么给了?

推荐答案

你的 m_VariableList 是否实现了 INotifyCollectionChanged?如果它不是 ObservableCollection，那么对其内容的更改将不会自动反映在 UI 中.

Is your m_VariableList implementing INotifyCollectionChanged? If it's not an ObservableCollection, then changes to it's contents will not automatically be reflected in the UI.

这篇关于WPF ListBox 未使用 ItemsSource 更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！