有没有办法在 WPF 中隐藏组合框的项目?
在我的用户控件中,有一个列表框,其中复选框项目绑定到 ObservableCollection 和一个带有组合框的数据网格。
<ListBox x:Name="AvailableAttributes" Grid.Row="0" Grid.Column="2" SelectionMode="Single" >
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=OneWay}"/>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding Name}" IsChecked="{Binding IsSelected}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
...
<DataGrid Name="datagrid" AutoGenerateColumns="False" >
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Name}" />
<DataGridComboBoxColumn
SelectedValueBinding="{Binding CBID}"
DisplayMemberPath="Name"
SelectedValuePath="ID">
<DataGridComboBoxColumn.ElementStyle>
<Style TargetType="{x:Type ComboBox}">
<Setter Property="ItemsSource"
Value="{Binding Path=CBItems, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" />
</Style>
</DataGridComboBoxColumn.ElementStyle>
<DataGridComboBoxColumn.EditingElementStyle>
<Style TargetType="{x:Type ComboBox}">
<Setter Property="ItemsSource"
Value="{Binding Path=CBItems, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" />
</Style>
</DataGridComboBoxColumn.EditingElementStyle>
</DataGridComboBoxColumn>
</DataGrid.Columns>
</DataGrid>
I used 这个解决方案 https://stackoverflow.com/questions/5409259/binding-itemssource-of-a-comboboxcolumn-in-wpf-datagrid管理组合框项目并添加属性“IsSelected”
public class GridItem
{
public string Name { get; set; }
public int CBID { get; set; }
}
public class CBItem
{
public int ID { get; set; }
public string Name { get; set; }
public bool IsSelected { get; set; }
}
现在我想使用“IsSelected”属性来隐藏/显示组合框中的项目。有人能告诉我如何实现这一目标吗?
非常简单:只需为组合框项目指定一个带有设置触发器的样式ComboBoxItem.Visibility
根据 的值IsSelected
on the ComboBoxItem
's DataContext
:
<Style TargetType="{x:Type ComboBox}" BasedOn="{StaticResource {x:Type ComboBox}}">
<Setter Property="ItemsSource"
Value="{Binding Path=CBItems, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" />
<Setter Property="ItemContainerStyle">
<Setter.Value>
<Style TargetType="ComboBoxItem" BasedOn="{StaticResource {x:Type ComboBoxItem}}">
<Style.Triggers>
<DataTrigger Binding="{Binding IsSelected}" Value="False">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</Setter.Value>
</Setter>
</Style>
如果您可能要更新IsSelected
在组合框加载到网格中后,在任何这些项目上,您将需要实施 INotifyPropertyChanged https://stackoverflow.com/a/29979567/424129 on CBItem
以便 UI 反映更改。
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