WPF DataGrid - Grouping

WPF DataGrid is also used for showing group of items

DataGrid use ListCollectionView class for grouping the associated list. DataGrid GroupStyle.ContainerStyle provides a way to display Group Item detail and its associated items.

ListCollectionView Class

ListCollectionView constructor takes an IList collection and has a GroupDescriptions list property.

In the GroupDescriptions property, you can add PropertyGroupDescription class which accepts the PropertyName as parameter like shown below:

ListCollectionView collectionView = new ListCollectionView(employees);
collectionView.GroupDescriptions.Add(new PropertyGroupDescription("Type"));
myDataGrid.ItemsSource = collectionView;

This property name in PropertyGropuDescription is used for grouping on the bounded list.

GroupStyle.ContainerStyle

In the GroupStyle.ContainerStyle, you can provide a Style that will apply to every group item.

In the TargetType set GroupItem type and set a new ControlTemplate in the Template property like shown below:

<DataGrid.GroupStyle>
	<GroupStyle>
		<GroupStyle.ContainerStyle>
			<Style TargetType="{x:Type GroupItem}">
				<Setter Property="Template">
					<Setter.Value>
						<ControlTemplate TargetType="{x:Type GroupItem}">
							<!--Provide UI Controls-->
						</ControlTemplate>
					</Setter.Value>
				</Setter>
			</Style>
		</GroupStyle.ContainerStyle>
	</GroupStyle>
</DataGrid.GroupStyle>

WPF DataGrid Grouping Example

<Window x:Class="WpfApplication7.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        xmlns:local="clr-namespace:WpfApplication7"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DataGrid x:Name="myDataGrid" CanUserAddRows="False">
            <DataGrid.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type GroupItem}">
                                        <StackPanel>
                                            <StackPanel Orientation="Horizontal">
                                                <TextBlock Text="{Binding Name}" />
                                                <TextBlock Text="{Binding ItemCount, StringFormat=Count: {0}}" Margin="30,0,0,0" />
                                            </StackPanel>
                                            <ItemsPresenter />
                                        </StackPanel>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </DataGrid.GroupStyle>
        </DataGrid>
    </Grid>
</Window>

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

namespace WpfApplication7
{
    public partial class MainWindow : Window
    {
        ObservableCollection<Employee> employees = new ObservableCollection<Employee>();

        public MainWindow()
        {
            InitializeComponent();

            employees.Add(new Employee { ID = 1, Name = "Mike", IsMale = true, Type = EmployeeType.Normal, SiteID = new Uri("http://localhost/4322"), BirthDate = new DateTime(1980, 1, 1) });
            employees.Add(new Employee { ID = 2, Name = "George", IsMale = true, Type = EmployeeType.Manager, SiteID = new Uri("http://localhost/4432"), BirthDate = new DateTime(1984, 2, 1) });
            employees.Add(new Employee { ID = 3, Name = "Vicky", IsMale = false, Type = EmployeeType.Supervisor, SiteID = new Uri("http://localhost/4872"), BirthDate = new DateTime(1975, 3, 1) });
            employees.Add(new Employee { ID = 4, Name = "Michael", IsMale = true, Type = EmployeeType.Normal, SiteID = new Uri("http://localhost/4322"), BirthDate = new DateTime(1988, 1, 1) });
            employees.Add(new Employee { ID = 5, Name = "Martin", IsMale = true, Type = EmployeeType.Normal, SiteID = new Uri("http://localhost/4432"), BirthDate = new DateTime(1989, 2, 1) });
            employees.Add(new Employee { ID = 6, Name = "Lucy", IsMale = false, Type = EmployeeType.Supervisor, SiteID = new Uri("http://localhost/4872"), BirthDate = new DateTime(1967, 3, 1) });
            employees.Add(new Employee { ID = 7, Name = "Brian", IsMale = true, Type = EmployeeType.Normal, SiteID = new Uri("http://localhost/4322"), BirthDate = new DateTime(1942, 1, 1) });
            employees.Add(new Employee { ID = 8, Name = "Santa", IsMale = true, Type = EmployeeType.Normal, SiteID = new Uri("http://localhost/4432"), BirthDate = new DateTime(1976, 2, 1) });
            employees.Add(new Employee { ID = 9, Name = "Ruby", IsMale = false, Type = EmployeeType.Normal, SiteID = new Uri("http://localhost/4872"), BirthDate = new DateTime(1990, 3, 1) });

            ListCollectionView collectionView = new ListCollectionView(employees);
            collectionView.GroupDescriptions.Add(new PropertyGroupDescription("Type"));
            myDataGrid.ItemsSource = collectionView;
        }
    }

    public class Employee
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public bool IsMale { get; set; }
        public EmployeeType Type { get; set; }
        public Uri SiteID { get; set; }
        public DateTime BirthDate { get; set; }
    }

    public enum EmployeeType
    {
        Normal,
        Supervisor,
        Manager
    }
}