使WPF ListBox逗号分隔值 [英] Make a WPF ListBox comma separate values

问题描述

我有一个看起来像这样的ListBox:

I have a ListBox that looks like this:

<ListBox ItemsSource="{Binding Fruits}">
    <!--Make the items wrap--> 
    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <WrapPanel></WrapPanel>
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Name, StringFormat=' {0},'}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

这会给我这样的列表:

橘子，葡萄，香蕉，

Oranges, Grapes, Bananas,

但是我想要的是:

桔子，葡萄，香蕉

Oranges, Grapes, Bananas

(不带逗号)

有人知道如何删除结尾的逗号吗?

推荐答案

可以使用创建一个转换器以确定值是否为列表框中的最后一项-

Create a converter to determine if value is last item in listbox -

public class IsLastItemInContainerConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter,
                          CultureInfo culture)
    {
        DependencyObject item = (DependencyObject)value;
        ItemsControl ic = ItemsControl.ItemsControlFromItemContainer(item);

        return ic.ItemContainerGenerator.IndexFromContainer(item) ==
                                                        ic.Items.Count - 1;
    }

    public object ConvertBack(object value, Type targetType, object parameter,
                              CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

现在修改您的XAML并在DataTemplate上添加触发器，以从TextBlock上的StringFormat中删除逗号-

Now modify your XAML and add trigger on DataTemplate to remove comma from StringFormat on your TextBlock -

<ListBox ItemsSource="{Binding Fruits}">
   <ListBox.Resources>
      <local:IsLastItemInContainerConverter
             x:Key="IsLastItemInContainerConverter"/>
   </ListBox.Resources>
   <ListBox.ItemsPanel>
      <ItemsPanelTemplate>
         <WrapPanel/>
      </ItemsPanelTemplate>
   </ListBox.ItemsPanel>
   <ListBox.ItemTemplate>
      <DataTemplate>
         <TextBlock x:Name="textBlock"
                    Text="{Binding Name, StringFormat=' {0},'}" />
            <DataTemplate.Triggers>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource 
                                               Mode=FindAncestor, 
                                               AncestorType=ListBoxItem},
                                               Converter={StaticResource IsLastItemInContainerConverter}}" 
                             Value="True">
                    <Setter Property="Text" TargetName="textBlock"
                            Value="{Binding Name, StringFormat=' {0}'}"/>
                 </DataTrigger>
            </DataTemplate.Triggers>
       </DataTemplate>
   </ListBox.ItemTemplate>
</ListBox>

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