Grouping C1CollectionView

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Group your collection by a particular property using the GroupDescriptions property on C1CollectionView.

For example, to group the collection by the "Country" property:

Visual Basic	Copy Code
Dim list = New System.Collections.ObjectModel.ObservableCollection(Of Customer)() ' create a C1CollectionView from the list _view = New C1.Xaml.C1CollectionView(list) ' group customers by country _view.GroupDescriptions.Add(New C1.Xaml.PropertyGroupDescription("Country"))

Visual Basic

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Dim list = New System.Collections.ObjectModel.ObservableCollection(Of Customer)() 
' create a C1CollectionView from the list
_view = New C1.Xaml.C1CollectionView(list)

' group customers by country
_view.GroupDescriptions.Add(New C1.Xaml.PropertyGroupDescription("Country"))

C#	Copy Code
var list = new System.Collections.ObjectModel.ObservableCollection<Customer>(); // create a C1CollectionView from the list _view = new C1.Xaml.C1CollectionView(list); // group customers by country _view.GroupDescriptions.Add(new C1.Xaml.PropertyGroupDescription("Country"));

Copy Code

var list = new System.Collections.ObjectModel.ObservableCollection<Customer>();

// create a C1CollectionView from the list
_view = new C1.Xaml.C1CollectionView(list);

// group customers by country
_view.GroupDescriptions.Add(new C1.Xaml.PropertyGroupDescription("Country"));

Note: If the collection implements INotifyCollectionChanged any changes to the data will be applied to the grouping even after it’s been set.

The C1FlexGrid control supports grouping on C1CollectionView for you. If you are grouping with any other control you will need to define a GroupStyle to control the appearance of each group.

For example, here is a GroupStyle defined for a standard ListBox control:

Markup	Copy Code
<ListBox Name="_listBox" ItemsSource="{Binding Customers}"> <ListBox.GroupStyle> <GroupStyle> <GroupStyle.HeaderTemplate> <DataTemplate> <TextBlock Text="{Binding}" /> </DataTemplate> </GroupStyle.HeaderTemplate> </GroupStyle> </ListBox.GroupStyle> </ListBox>

Markup

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<ListBox
    Name="_listBox"
    ItemsSource="{Binding Customers}">
    <ListBox.GroupStyle>
        <GroupStyle>
            <GroupStyle.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding}" />
                </DataTemplate>
            </GroupStyle.HeaderTemplate>
        </GroupStyle>
    </ListBox.GroupStyle>
</ListBox>