WPF ListBox不使用ItemsSource进行更新 [英] WPF ListBox not updating with the ItemsSource

问题描述

我有相信应该是在WPF设置中简单的双向数据绑定，但是收件箱更改时，列表框（目标）不会更新。

以编程方式设置ListBox的ItemsSource：

  lstVariable_Selected.ItemsSource = m_VariableList; 
  

列表框的声明如下：

 < ListBox Margin =5Name =lstVariable_Selected> 
< ListBox.ItemsPanel> 
< ItemsPanelTemplate> 
< VirtualizingStackPanel Orientation =Horizo​​ntal/> 
< / ItemsPanelTemplate> 
< /ListBox.ItemsPanel> 
< ListBox.ItemTemplate> 
< DataTemplate> 
< Border BorderBrush =GrayBorderThickness =1Margin =0> 
< TextBlock FontSize =25Text ={Binding Path = Name}/> 
< / Border> 
< / DataTemplate> 
< /ListBox.ItemTemplate> 
< / ListBox> 
  

当我初始设置ItemsSource时，ListBox（当时不可见）获取其项组。但是，如果我查看列表框，更新似乎停止在那一点。

然后，我可以从m_VariableList集合中删除一个项目，它不会从列表框。同样，如果我添加一个，它不会出现。

什么给了？

解决方案

您的m_VariableList是否实施 INotifyCollectionChanged ？如果它不是一个ObservableCollection，那么对其内容的更改将不会自动反映在UI中。

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.

I'm setting this ItemsSource of the ListBox programmatically:

lstVariable_Selected.ItemsSource = m_VariableList;

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>

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.

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.

What gives?

解决方案

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.

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