WPF HandleListBoxClickEvent 仅适用于列表的空 space

Question

为什么 HandleListBoxClickEvent 仅对列表的空 space 有效？问题是当我想刷新列表时。单击某些项目时 - 没有任何更新。但是单击列表的空 space（当某些项目被选中时）- 所选项目正在更新。

我认为 xaml 应该有一些问题，因为我正在使用 c# 代码跟踪一个准备好的（工作）示例。

资源：

    <UserControl.Resources>
    <Style x:Key="RedGlowItemContainer" TargetType="{x:Type ListBoxItem}">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListBoxItem}">
                    <Border Name="IconBorder" Background="#00FFFFFF">
                        <ContentPresenter />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="ListBoxItem.IsSelected" Value="True">
                            <Setter TargetName="IconBorder" Property="Border.Background" Value="#FF07A3E9" />
                            <Setter Property="Control.FontWeight" Value="Bold" />
                            <Setter Property="Control.Foreground" Value="#FFFFFFFF" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <DataTemplate x:Key="CategoryTemplate" DataType="{x:Type vm:OrderEntryViewModel}">
        <vw:MenuItemSelectorView />
    </DataTemplate>
    <mmc:OrderTemplateSelector x:Key="PanelTemplateSelector" />
</UserControl.Resources>

视图模型：

internal class OrderEntryViewModel : ViewModelBase, IParentViewModel, IViewModelBase
{
...
public void HandleListBoxClickEvent()
    {
        if (this._selectedOrder != null)
        {
            if (this._selectedOrder.IsNew)
            {
                if (this._qty != "")
                {
                    this._selectedOrder.Quantity = int.Parse(this._qty);
                    this.SelectedQuantity = "";
                    this.CalculateTotal();
                }
            }
        }
}
...
}

xaml.cs:

public partial class OrderEntryView : System.Windows.Controls.UserControl
{
    private bool isExpended = true;

    public OrderEntryView()
    {
        this.InitializeComponent();
    }

    private void LstTicket_MouseDown(object sender, MouseButtonEventArgs e)
    {
        ((OrderEntryViewModel)base.DataContext).HandleListBoxClickEvent();
    }

    private void UserControl_Loaded(object sender, RoutedEventArgs e)
    {
    }
}

xaml 列表：

 <ListBox Name="LstTicket" IsSynchronizedWithCurrentItem="True" VerticalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Hidden" ScrollViewer.VerticalScrollBarVisibility="Hidden" ItemContainerStyle="{StaticResource RedGlowItemContainer}" FontSize="12" ItemsSource="{Binding Orders, Mode=TwoWay}" SelectedItem="{Binding SelectedOrder, Mode=TwoWay}" Common:ListBoxExtenders.AutoScrollToEnd="True" MouseDown="LstTicket_MouseDown" Grid.Row="1">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel HorizontalAlignment="Stretch" Background="#00FFFFFF">
                        <Grid Background="#00FFFFFF" Width="230">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="24" />
                                <ColumnDefinition Width="*" />
                                <ColumnDefinition Width="45" />
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="25" />
                            </Grid.RowDefinitions>
                            <TextBlock Style="{DynamicResource StyleStrikethrough}" Grid.Column="0" Width="24" Padding="0" HorizontalAlignment="Left" Text="{Binding Quantity, StringFormat=0}" />
                            <TextBlock Style="{DynamicResource StyleStrikethrough}" Grid.Column="1" HorizontalAlignment="Left" Padding="0" Text="{Binding DisplayName}" />
                            <TextBlock Style="{DynamicResource StyleStrikethrough}" Grid.Column="2" Padding="0" HorizontalAlignment="Right" Text="{Binding TotalPrice, StringFormat=N2}" />
                        </Grid>
                        <ItemsControl ItemsSource="{Binding OrderModifiers}">
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <Grid Background="#00FFFFFF">
                                        <Label Padding="0" Foreground="#FF0000FF" Margin="30,0,0,0" HorizontalAlignment="Left" Content="{Binding DisplayName}" />
                                        <Label Padding="0" Foreground="#FF0000FF" Margin="0,0,20,0" HorizontalAlignment="Right" Content="{Binding Price, StringFormat=N2}" />
                                    </Grid>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                        <ItemsControl ItemsSource="{Binding OrderSetItems}">
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel>
                                        <Grid Background="#00FFFFFF" Width="230">
                                            <Grid.ColumnDefinitions>
                                                <ColumnDefinition Width="24" />
                                                <ColumnDefinition Width="*" />
                                                <ColumnDefinition Width="45" />
                                            </Grid.ColumnDefinitions>
                                            <Grid.RowDefinitions>
                                                <RowDefinition Height="15" />
                                            </Grid.RowDefinitions>
                                            <TextBlock Style="{DynamicResource StyleStrikethrough}" Margin="10,0,0,0" Grid.Column="0" Width="24" Padding="0" HorizontalAlignment="Left" Text="{Binding Quantity, StringFormat=0}" />
                                            <TextBlock Style="{DynamicResource StyleStrikethrough}" Grid.Column="1" HorizontalAlignment="Left" Padding="0" Text="{Binding DisplayName}" />
                                            <TextBlock Style="{DynamicResource StyleStrikethrough}" Grid.Column="2" Padding="0" HorizontalAlignment="Right" Text="{Binding TotalPrice, StringFormat=N2}" />
                                        </Grid>
                                        <ItemsControl ItemsSource="{Binding OrderSetModifiers}">
                                            <ItemsControl.ItemTemplate>
                                                <DataTemplate>
                                                    <Grid Background="#00FFFFFF">
                                                        <Label Padding="0" Foreground="#FF0000FF" Margin="30,0,0,0" HorizontalAlignment="Left" Content="{Binding DisplayName}" />
                                                        <Label Padding="0" Foreground="#FF0000FF" Margin="0,0,20,0" HorizontalAlignment="Right" Content="{Binding Price}" />
                                                    </Grid>
                                                </DataTemplate>
                                            </ItemsControl.ItemTemplate>
                                        </ItemsControl>
                                    </StackPanel>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

Answer 1

没有 a good, minimal, complete code example 清楚地说明问题，尝试提供工作代码示例是不切实际的。

但我可以告诉您基本问题是什么：当用户单击您 ListBox 中的实际项目时，该项目本身会处理用户输入。

您可以预览鼠标事件（参见 Mouse.PreviewMouseDown Attached Event, paying close attention to the documented caveats), or you can handle the MouseDown event in the list item itself. See e.g. How can I get an event or command to fire when the user clicks on a ListViewItem? 了解更多相关信息。

WPF HandleListBoxClickEvent 仅适用于列表的空 space

WPF HandleListBoxClickEvent works only on the empty space of the list

c#

wpf

xaml

listbox

mouseclick-event