[C#/WPF] ListBox 클래스 : ListCollectionView를 이용해 GroupStyle 설정하기

▶ XAML

<ListBox Name="listBox">
    <ListBox.ItemTemplate>
    ...
    </ListBox.ItemTemplate>
    <ListBox.GroupStyle>
        <GroupStyle>
            <GroupStyle.HeaderTemplate>
                <DataTemplate>
                    <TextBlock
                        Margin="6"
                        Foreground="White"
                        Background="DarkGray"
                        FontWeight="Bold"
                        FontSize="12pt"
                        Text="{Binding Path=Name}" />
                </DataTemplate>
            </GroupStyle.HeaderTemplate>
        </GroupStyle>
    </ListBox.GroupStyle>
</ListBox>

 

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▶ C#

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Globalization;
using System.Windows.Data;

...

/// <summary>
/// 기간 그룹 설명자
/// </summary>
public class PeriodGroupDescription : GroupDescription
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 항목에서 그룹 명칭 구하기 - GroupNameFromItem(item, level, cultureInfo)

    /// <summary>
    /// 항목에서 그룹 명칭 구하기
    /// </summary>
    /// <param name="item">항목</param>
    /// <param name="level">레벨</param>
    /// <param name="cultureInfo">CultureInfo 객체</param>
    /// <returns>그룹 명칭</returns>
    public override object GroupNameFromItem(object item, int level, CultureInfo cultureInfo)
    {
        Person person = item as Person;

        if(person.BirthDate == null)
        {
            return "Unknown";
        }

        int year = ((DateTime)person.BirthDate).Year;

        if(year < 1575) return "Pre-Baroque";
        if(year < 1725) return "Baroque";
        if(year < 1795) return "Classical";
        if(year < 1870) return "Romantic";
        if(year < 1910) return "20th Century";

        return "Post-War";
    }

    #endregion
}

...

ObservableCollection<Person> observableCollection = new ObservableCollection<Person>();

...

ListCollectionView listCollectionView = new ListCollectionView(observableCollection);

listCollectionView.SortDescriptions.Add(new SortDescription("BirthDate", ListSortDirection.Ascending));

listCollectionView.GroupDescriptions.Add(new PeriodGroupDescription());

...

this.listBox.ItemsSource = listCollectionView;

if(this.listBox.Items.Count > 0)
{
    this.listBox.SelectedIndex = 0;
}