набор wpf, сортирующий программно, так, чтобы заголовок был переключен, как отсортировано

В приведенном ниже примере вы сможете сортировать сетку данных, используя поля со списком, а также нажимая непосредственно на сетке данных.

XAML:

<Window x:Class="DataGridDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:Controls="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit"
    xmlns:System="clr-namespace:System;assembly=mscorlib"
    xmlns:ComponentModel="clr-namespace:System.ComponentModel;assembly=System"
    Height="300" Width="300">

    <Window.Resources>
        <ObjectDataProvider MethodName="GetValues" 
            ObjectType="{x:Type System:Enum}" 
            x:Key="SortDirections">
            <ObjectDataProvider.MethodParameters>
                <x:Type TypeName="ComponentModel:ListSortDirection" />
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
    </Window.Resources>

    <StackPanel>
        <ComboBox 
            Name="_columnsComboBox"
            ItemsSource="{Binding Path=Columns, ElementName=_dataGrid}" 
            DisplayMemberPath="Header"
            SelectionChanged="OnSort" />
        <ComboBox 
            Name="_sortDirectionsComboBox"
            ItemsSource="{Binding Source={StaticResource SortDirections}}" 
            SelectionChanged="OnSort" />
        <Controls:DataGrid 
            Name="_dataGrid"
            ItemsSource="{Binding Path=PeopleData}" />

    </StackPanel>
</Window>

Код позади:

using System;
using System.ComponentModel;
using System.Data;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using Microsoft.Windows.Controls;

namespace DataGridDemo
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            PeopleData = new DataTable();
            PeopleData.Columns.Add(new DataColumn("Name", typeof(string)));
            PeopleData.Columns.Add(new DataColumn("Age", typeof(int)));

            var row = PeopleData.NewRow();
            row["Name"] = "Sara";
            row["Age"] = 25;
            PeopleData.Rows.Add(row);

            row = PeopleData.NewRow();
            row["Name"] = "Bob";
            row["Age"] = 37;
            PeopleData.Rows.Add(row);

            row = PeopleData.NewRow();
            row["Name"] = "Joe";
            row["Age"] = 10;
            PeopleData.Rows.Add(row);

            DataContext = this;
        }

        public DataTable PeopleData { get; private set;}

        private void OnSort(object sender, SelectionChangedEventArgs e)
        {
            if (_sortDirectionsComboBox.SelectedIndex == -1 || _columnsComboBox.SelectedIndex == -1)
            {
                return;
            }

            foreach (DataGridColumn dataColumn in _dataGrid.Columns)
            {
                dataColumn.SortDirection = null;
            }

            ListSortDirection sortDescription = (ListSortDirection)(_sortDirectionsComboBox.SelectedItem);
            DataGridColumn selectedDataColumn = _columnsComboBox.SelectedItem as DataGridColumn;
            selectedDataColumn.SortDirection = sortDescription;

            ICollectionView view = CollectionViewSource.GetDefaultView(_dataGrid.ItemsSource);
            view.SortDescriptions.Clear();
            view.SortDescriptions.Add(new SortDescription(selectedDataColumn.Header as string, sortDescription));
            view.Refresh();
        }
    }
}