AccordionControl.AllowCollectionView Property

Gets or sets whether to allow process collection views. This is a dependency property.

Namespace: DevExpress.Xpf.Accordion

Assembly: DevExpress.Xpf.Accordion.v19.2.dll

Declaration

C#

public bool AllowCollectionView { get; set; }

VB.NET

Public Property AllowCollectionView As Boolean

Property Value

Type	Description
Boolean	true, to allow processing collection views; otherwise, false.

Remarks

The AccordionControl includes support for ICollectionViews – allowing you to manipulate the current record, and define rules for filtering, sorting and grouping.

If the AllowCollectionView property is set to false and an ICollectionView is used as a data source, the AccordionControl transforms the ICollectionView to a plain list, internally. In this instance, rules defined for filtering, grouping and sorting in the ICollectionView are ignored.

Example

This example demonstrates how to bind the AccordionControl to a collection view and synchronize the selected item with the collection view.

View:

Xaml

<Window x:Class="CollectionViewSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
        xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
        xmlns:dxa="http://schemas.devexpress.com/winfx/2008/xaml/accordion"        
        xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"
        xmlns:componentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase"
        dx:ThemeManager.Theme="Office2019Colorful"
        xmlns:local="clr-namespace:CollectionViewSample"
        DataContext="{dxmvvm:ViewModelSource local:ViewModel}"
        Title="Products" Height="450" Width="500">
    <Window.Resources>
        <CollectionViewSource Source="{Binding Products}" x:Key="Products" >
            <CollectionViewSource.SortDescriptions>
                <componentModel:SortDescription PropertyName="ProductName" Direction="Ascending"/>
            </CollectionViewSource.SortDescriptions>
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="Category"/>
            </CollectionViewSource.GroupDescriptions>
        </CollectionViewSource>
    </Window.Resources>
    <Grid Margin="5">
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <dxe:ListBoxEdit ItemsSource="{Binding Source={StaticResource Products}}"
                         DisplayMember="ProductName" 
                         AllowCollectionView="True" IsSynchronizedWithCurrentItem="True">
            <dxe:ListBoxEdit.GroupStyle>
                <x:Static Member="GroupStyle.Default"/>
            </dxe:ListBoxEdit.GroupStyle>
        </dxe:ListBoxEdit>

        <dxa:AccordionControl Grid.Column="1" ItemsSource="{Binding Source={StaticResource Products}}" 
                              AutoExpandAllItems="True" ChildrenPath="Items"
                              AllowCollectionView="True" IsSynchronizedWithCurrentItem="True" ShowSearchControl="True">
            <dxa:AccordionControl.ItemContainerStyle>
                <Style TargetType="dxa:AccordionItem">
                    <Style.Triggers>
                        <Trigger Property="ItemLevel" Value="1">
                            <Setter Property="Header" Value="{Binding ProductName}"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </dxa:AccordionControl.ItemContainerStyle>
        </dxa:AccordionControl>
    </Grid>
</Window> 

View Model:

C#

using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace CollectionViewSample {
    public class ViewModel {
        public virtual ReadOnlyCollection<Product> Products { get; set; }

        public ViewModel() {
            Products = new ReadOnlyCollection<Product>(CreateProducts());
        }
        List<Product> CreateProducts() {
            var result = new List<Product> {
                new Product("Queso Manchego La Pastora", "Cheeses"),
                new Product("Gorgonzola Telino", "Cheeses"),
                new Product("Chai", "Beverages"),
                new Product("Outback Lager", "Beverages"),
                new Product("Mozzarella di Giovannia", "Cheeses"),
                new Product("Geitost", "Cheeses"),
                new Product("Chartreuse verte", "Beverages"),
                new Product("Ipoh Coffee", "Beverages")
            };
            return result;
        }
    }
    public class Product {
        public Product(string productName, string category) {
            ProductName = productName;
            Category = category;
        }
        public string ProductName { get; set; }
        public string Category { get; set; }

        public override string ToString() {
            return ProductName;
        }
    }
}

VB.NET

Imports System.Collections.Generic
Imports System.Collections.ObjectModel

Namespace CollectionViewSample
    Public Class ViewModel
        Public Overridable Property Products As ReadOnlyCollection(Of Product)

        Public Sub New()
            Products = New ReadOnlyCollection(Of Product)(CreateProducts())
        End Sub

        Private Function CreateProducts() As List(Of Product)
            Dim result = New List(Of Product) From {
                New Product("Queso Manchego La Pastora", "Cheeses"),
                New Product("Gorgonzola Telino", "Cheeses"),
                New Product("Chai", "Beverages"),
                New Product("Outback Lager", "Beverages"),
                New Product("Mozzarella di Giovannia", "Cheeses"),
                New Product("Geitost", "Cheeses"),
                New Product("Chartreuse verte", "Beverages"),
                New Product("Ipoh Coffee", "Beverages")
            }
            Return result
        End Function
    End Class

    Public Class Product
        Public Sub New(ByVal productName As String, ByVal category As String)
            ProductName = productName
            Category = category
        End Sub

        Public Property ProductName As String
        Public Property Category As String

        Public Overrides Function ToString() As String
            Return ProductName
        End Function
    End Class
End Namespace