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