在 WPF 中将命令绑定到 ComboBoxItem
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Binding Commands to ComboBoxItem in WPF
提问by jpaull
I have a simple ComboBox that I want to trigger separate commands each time the selected value changes. Here is an example of my markup:
我有一个简单的 ComboBox，我想在每次选定的值更改时触发单独的命令。这是我的标记示例：
<WrapPanel Grid.Row="0" Visibility="{Binding ShowToggleViewFeedViewManual}">
<ComboBox Margin="3,3,0,0">
<ComboBoxItem IsEnabled="{Binding CanSelectViewFeedData}" >
<ComboBoxItem.CommandBindings>
<CommandBinding Command="SelectViewFeedDataCommand" />
</ComboBoxItem.CommandBindings>
<TextBlock Text="View Feed Data"/>
</ComboBoxItem>
<ComboBoxItem IsEnabled="{Binding CanSelectViewManualData}">
<ComboBoxItem.CommandBindings>
<CommandBinding Command="SelectManualFeedDataCommand" />
</ComboBoxItem.CommandBindings>
<TextBlock Text="View Manual Data"/>
</ComboBoxItem>
</ComboBox>
</WrapPanel>
I get an error stating "Cannot convert 'SelectViewFeedDataCommand'". I get a similar error for the other ComboBoxItem as well. The ICommand is defined in the ViewModel Class that is the DataSource for the UserControl, bound as a DataTemplate.
我收到一条错误消息，指出“无法转换‘SelectViewFeedDataCommand’”。我也收到其他 ComboBoxItem 的类似错误。ICommand 在 ViewModel 类中定义，该类是 UserControl 的数据源，绑定为 DataTemplate。
public ICommand SelectViewFeedDataCommand
{
get
{
// Code to perform
}
}
I have researched this pretty extensively but haven't found an answer for how to effectively bind the ICommand to the ComboBoxItem.
我对此进行了广泛的研究，但还没有找到如何有效地将 ICommand 绑定到 ComboBoxItem 的答案。
I am adapting this from existing code that used a set of radiobuttons and associated commands, which is done pretty easily. Is there no simple way to do this with a ComboBox?
我正在从使用一组单选按钮和相关命令的现有代码中调整这一点，这很容易完成。使用 ComboBox 没有简单的方法可以做到这一点吗？
Thanks.
谢谢。
采纳答案by jpaull
I was looking at my old posts and realized that I never posted the solution to my question... pretty simple really (if not elegant). I just created a List in my ViewModel that contained my Combo Box "choices" and then when the SelectedValue was changed, triggered my "changed" logic in the setter for the property:
我正在查看我的旧帖子并意识到我从未发布过我的问题的解决方案......真的很简单（如果不优雅的话）。我刚刚在我的 ViewModel 中创建了一个包含我的组合框“选择”的列表，然后当 SelectedValue 更改时，在属性的 setter 中触发了我的“更改”逻辑：
<WrapPanel Grid.Row="0" Visibility="{Binding ShowToggleFeedViewManual}" >
<ComboBox Margin="10,10,10,10" Width="200" ItemsSource="{Binding AvailableDataSources}" SelectedValue="{Binding SelectedDataSource}"/>
</WrapPanel>
And from the view-model:
从视图模型：
public FeedSource SelectedDataSource
{
get { return _selectedDataSource; }
set
{
_selectedDataSource = value;
base.OnPropertyChanged("SelectedDataSource");
//additional code to perform here
}
}
回答by Josh
Have you tried putting the command to a binding?
您是否尝试将命令置于绑定中？
<CommandBinding Command="{Binding SelectManualFeedDataCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" />
Edit for updated strategy:
编辑更新策略：
Since the ComboBox item doesn't support direct command binding, try creating an attached property:
由于 ComboBox 项不支持直接命令绑定，请尝试创建附加属性：
