[英]WPF Combobox selection disappears when the an item is deleted in the list bound to combobox
[英]WPF ComboBox bound with object list and display less different value in selected item than in the item list
我有这个 ComboBox:
<ComboBox
ItemsSource="{Binding imageFormats}">
<ComboBox.ItemTemplate>
<DataTemplate>
<DockPanel>
<TextBlock DockPanel.Dock="Left" Text="{Binding Extension}" />
<TextBlock DockPanel.Dock="Left" Text=" - " />
<TextBlock DockPanel.Dock="Right" Text="{Binding Description}" />
</DockPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
绑定到这个列表: private List<ImageFormatModel> imageFormats = new List<ImageFormatModel>();
public MainWindow()
{
ComboBoxImages.ItemsSource = imageFormats;
}
Object ImageFormatModel
由两个字符串组成:
public class ImageFormatModel
{
public string Extension { get; set; }
public string Description { get; set; }
}
所选项目是否可能仅显示扩展名但在下拉菜单中都显示?
这两个值都应显示在此菜单中:
您可以将带有DataTrigger
的Style
应用于要隐藏的TextBlock
元素:
<DataTemplate>
<DockPanel>
<DockPanel.Resources>
<Style x:Key="tbStyle" TargetType="TextBlock">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType=ComboBoxItem}}" Value="{x:Null}">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DockPanel.Resources>
<TextBlock DockPanel.Dock="Left" Text="{Binding Extension}" />
<TextBlock DockPanel.Dock="Left" Text=" - " Style="{StaticResource tbStyle}" />
<TextBlock DockPanel.Dock="Right" Text="{Binding Description}" Style="{StaticResource tbStyle}" />
</DockPanel>
</DataTemplate>
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