我在listview中有一个按钮来删除选定的项目。当我点击按钮时,RemoveSubjectCommand没有触发。如果我把按钮放在listview外面,它就可以正常工作。希望这只是因为嵌套项目的原因。我该如何解决这个问题?
<ListView HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
HorizontalContentAlignment="Stretch" Grid.ColumnSpan="3" Grid.Row="2"
ItemsSource="{Binding AssignedSubjects}">
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Center" />
</Style>
</ListView.ItemContainerStyle>
<ListView.View>
<GridView>
<GridViewColumn Width="140" Header="Subjects" DisplayMemberBinding="{Binding Name}" />
<GridViewColumn Width="auto">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="X" Command="{Binding RemoveSubjectCommand}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
视图模型,
private ICommand removeSubjectCommand;
**
public ICommand RemoveSubjectCommand
{
get { return removeSubjectCommand ?? (removeSubjectCommand = new RelayCommand(param => this.RemoveSubject(), null)); }
}
**
private void RemoveSubject()
{ ***
}
如果我放置以下代码,它将正常工作。
<ListView.InputBindings>
<KeyBinding Key="Delete" Command="{Binding RemoveSubjectCommand}" />
</ListView.InputBindings>
CommandParameter
按钮。例如,使用CommandParameter="{Binding}"
将其绑定到 ListViewItem 的 DataContext(即 item 本身)。然后,在你的 ViewModel 中,你可以定义DelegateCommand
来接受参数,例如public DelegateCommand<object> RemoveSubjectCommand{ get; }
(注意我添加的<object>
,它也可以是任何其他类型,只要一切保持一致即可)。 - Stefan