组合框中的项目分组 [英] Grouping items in a ComboBox

问题描述

我有一个 ListView，它包含两种类型的对象，单个对象和多个对象.单个是一个普通的 TextBlock，而多个是一个带有项目的 ComboBox.

I have a ListView that contains two types of objects, single and multiple. The single is a ordinary TextBlock while the multiple is a ComboBox with items.

我试图对 ComboBox 中的项目进行分组，但没有成功.是否可以?或者我应该采取不同的方法?

I'm trying to group the items in the ComboBox without success. Is it possible? Or should I go for a different approach?

我正在努力实现的目标:

What I'm trying to achieve:

[ComboBox v]
    [Header  ]
    [    Item]
    [    Item]
    [Header  ]
    [    Item]

推荐答案

这是可能的.使用 ListCollectionView 和 GroupDescription 作为 ItemsSource并为您的 ComboBox 提供一个 GroupStyle.请参阅下面的示例:

It is possible. Use a ListCollectionView with a GroupDescription as the ItemsSource and just provide a GroupStyle to your ComboBox. See sample below:

XAML:

<Window x:Class="StackOverflow.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:StackOverflow"
        xmlns:uc="clr-namespace:StackOverflow.UserControls"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel>
        <ComboBox x:Name="comboBox">
            <ComboBox.GroupStyle>
                <GroupStyle>
                    <GroupStyle.HeaderTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Name}"/>
                        </DataTemplate>
                    </GroupStyle.HeaderTemplate>
                </GroupStyle>
            </ComboBox.GroupStyle>
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Name}"/>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
    </StackPanel>
</Window>

代码隐藏:

namespace StackOverflow
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {

        public MainWindow()
        {
            InitializeComponent();
            //this.comboBox.DataContext = this;

            List<Item> items = new List<Item>();
            items.Add(new Item() { Name = "Item1", Category = "A" });
            items.Add(new Item() { Name = "Item2", Category = "A" });
            items.Add(new Item() { Name = "Item3", Category = "A" });
            items.Add(new Item() { Name = "Item4", Category = "B" });
            items.Add(new Item() { Name = "Item5", Category = "B" });

            ListCollectionView lcv = new ListCollectionView(items);
            lcv.GroupDescriptions.Add(new PropertyGroupDescription("Category"));

            this.comboBox.ItemsSource = lcv;
        }


    }

    public class Item
    {
        public string Name { get; set; }
        public string Category { get; set; }
    }

}

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