Question

我正在使用WPF在C＃.NET 3.5中开发一个应用程序。我在对话框中有一个列表框。当鼠标到达列表框中的某个项目时，该项目将以蓝色背景突出显示。

当鼠标来到列表框中的某个项目时，我想执行某些操作。所以我为列表框项添加了鼠标输入和鼠标离开事件处理程序，如下所示：

XAML代码：

<ListBox  Name="listBox1" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="16,367,0,0" Width="181" Height="186" >
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <EventSetter Event="MouseEnter" Handler="listBox1_ListBoxItem_MouseEnter"/>
            <EventSetter Event="MouseLeave" Handler="listBox1_ListBoxItem_MouseLeave"/>
        </Style>
    </ListBox.ItemContainerStyle>
</ListBox>

C＃代码：

private void listBox1_ListBoxItem_MouseEnter(object sender, MouseEventArgs e)
{
    ListBoxItem Item = sender as ListBoxItem;

    // Perform operations using Item.

    e.Handled = false;
}

private void listBox1_ListBoxItem_MouseLeave(object sender, MouseEventArgs e)
{
    ListBoxItem Item = sender as ListBoxItem;

    // Perform operations using Item.

    e.Handled = false;
}

添加事件处理程序后，当鼠标悬停在项目上时，列表框项目不再突出显示。如何使用事件处理程序进行突出显示？

感谢您提供任何帮助。

Answer 1

您要覆盖ListBoxItem的默认样式，您应该使用BasedOn属性来扩展它

<ListBox  Name="listBox1" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="16,367,0,0" Width="181" Height="186" > 
    <ListBox.ItemContainerStyle> 
        <Style TargetType="ListBoxItem" BasedOn="{StaticResource {x:Type ListBoxItem}}"> 
            <EventSetter Event="MouseEnter" Handler="listBox1_ListBoxItem_MouseEnter"/> 
            <EventSetter Event="MouseLeave" Handler="listBox1_ListBoxItem_MouseLeave"/> 
        </Style> 
    </ListBox.ItemContainerStyle> 
</ListBox>

Answer 2

丢失默认样式。您可以重新添加颜色。但我喜欢Dtex的答案。

        <ListBox.ItemContainerStyle>
            <Style TargetType="ListBoxItem">
                <EventSetter Event="MouseEnter" Handler="listBox1_ListBoxItem_MouseEnter"/>
                <EventSetter Event="MouseLeave" Handler="listBox1_ListBoxItem_MouseLeave"/>
                <Style.Resources>
                    <!-- Background of selected item when focussed -->
                    <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}"
                        Color="Green"/>
                    <!-- Background of selected item when not focussed -->
                    <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}"
                        Color="LightGreen" />
                </Style.Resources>
            </Style>
        </ListBox.ItemContainerStyle>

C＃WPF：添加鼠标输入和鼠标离开事件处理程序后，ListBox项目未突出显示

2 个答案: