如何禁用取消选择 ListView 中的项目? [英] How to disable deselection of items in ListView?

问题描述

我有

<ListView SelectionMode="Single" SelectedIndex="0" ItemsSource="{Binding AccountViewModels}" SelectedItem="{Binding SelectedItem}" Style="{StaticResource AccountsList}">
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <LocalViews:AccountView Margin="{StaticResource ControlMargin}" />
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ListView>

有没有办法禁用从 ListView 中取消选择项目(即 ctrl+click)?换句话说，我不希望用户能够取消选择一个项目，但当然可以选择另一个项目.

Is there a way to disable deselection of an item from the ListView (i.e. ctrl+click)? In other words, I don't want the user to be able to de-select an item, but of course it's OK to select another item.

推荐答案

由于此功能纯粹与视图/控件相关，因此不应在视图模型中实现，但您可以像这样处理 ListBoxItem 容器的 PreviewMouseLeftButtonDown 事件:

Since this functionality is purely view/control related it should not be implemented in the view model but you could handle the PreviewMouseLeftButtonDown event of the ListBoxItem container like this:

<ListView SelectionMode="Single" SelectedIndex="0" ItemsSource="{Binding AccountViewModels}" SelectedItem="{Binding SelectedItem}" Style="{StaticResource AccountsList}">
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <EventSetter Event="PreviewMouseLeftButtonDown" Handler="ItemPreviewMouseLeftButtonDown" />
        </Style>
    </ListBox.ItemContainerStyle>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <LocalViews:AccountView Margin="{StaticResource ControlMargin}" />
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ListView>

<小时>

private void ItemPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    ListBoxItem lbi = sender as ListBoxItem;
    e.Handled = lbi.IsSelected;
}

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