SortDescriptions wpf

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

namespace SortDemo
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            Items = new ObservableCollection<Item>();
            Items.Add(new Item() { ID = "AAA", Value = 2 });
            Items.Add(new Item() { ID = "BBB", Value = 1 });

            DataContext = this;
        }

        public ObservableCollection<Item> Items { get; private set; }

        private void OnSort(object sender, RoutedEventArgs e)
        {
            string sortProperty = (sender as FrameworkElement).Tag as string;
            _itemsControl.Items.SortDescriptions.Clear();
            _itemsControl.Items.SortDescriptions.Add(new SortDescription(sortProperty, ListSortDirection.Ascending)); 
        }
    }

    public class Item
    {
        public string ID { get; set;}
        public int Value { get; set; }

        public override string ToString()
        {
            return ID + " " + Value;
        }
    }
}

Source: stackoverflow.com

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