WPF:当 TextBox 具有焦点时为 ListBox 设置 IsSelected，而不会丢失 LostFocus 上的选择

WPF: Setting IsSelected for ListBox when TextBox has focus, without losing selection on LostFocus(WPF:当 TextBox 具有焦点时为 ListBox 设置 IsSelected，而不会丢失 LostFocus 上的选择)

问题描述

我有一个带有 ListBoxItems 和模板的 ListBox，因此它们包含 TextBoxes

I've a ListBox with ListBoxItems with a template so they contain TextBoxes

当 TextBox 获得焦点时，我希望选择 ListBoxItem.我发现的一种解决方案如下所示:

When the TextBox gets focused I want the ListBoxItem to be selected. One solution I've found looks like this:

<Style TargetType="{x:Type ListBoxItem}">
    <Style.Triggers>
        <Trigger Property="IsKeyboardFocusWithin" Value="True">
            <Setter Property="IsSelected" Value="True"></Setter>
        </Trigger>
    </Style.Triggers>
</Style>

这很好用，但是当 TextBox 失去焦点时，选择也会失去焦点.

This works great, but when the TextBox loses focus so does the selection.

有没有办法防止这种情况发生?

Is there a way to prevent this from happening?

推荐答案

我发现的最好的解决方案是:

Best solution I've found to do this with no code behinde is this:

<Style TargetType="{x:Type ListBoxItem}">
    <Style.Triggers>
        <EventTrigger RoutedEvent="PreviewGotKeyboardFocus">
            <BeginStoryboard>
                <Storyboard>
                    <BooleanAnimationUsingKeyFrames
                        Storyboard.TargetProperty="(ListBoxItem.IsSelected)">

                        <DiscreteBooleanKeyFrame KeyTime="0" Value="True"/>
                    </BooleanAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Style.Triggers>
</Style>

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