Gets or sets a collection used to generate the content of the ItemsControl.
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
Metadata properties set to true
Content Model: This property may be used to add items to an ItemsControl.
A common scenario is to use an ItemsControl such as a ListBox, ListView, or TreeView to display a data collection, or to bind an ItemsControl to a collection object. To bind an ItemsControl to a collection object, use the property. Note that the property supports OneWay binding by default.
When the property is set, the Items collection is made read-only and fixed-size.
When is in use, setting the property to Nothing removes the collection and restores usage to Items, which will be an empty ItemCollection. When is not in use, the value of this property is Nothing, and setting it to Nothing has no effect.
This example shows how to create and bind to a collection that derives from the ObservableCollection(Of T) class, which is a collection class that provides notifications when items get added or removed.
The following example shows the implementation of a NameList collection:
Public Class NameList Inherits ObservableCollection(Of PersonName) ' Methods Public Sub New() MyBase.Add(New PersonName("Willa", "Cather")) MyBase.Add(New PersonName("Isak", "Dinesen")) MyBase.Add(New PersonName("Victor", "Hugo")) MyBase.Add(New PersonName("Jules", "Verne")) End Sub End Class Public Class PersonName ' Methods Public Sub New(ByVal first As String, ByVal last As String) Me._firstName = first Me._lastName = last End Sub ' Properties Public Property FirstName() As String Get Return Me._firstName End Get Set(ByVal value As String) Me._firstName = value End Set End Property Public Property LastName() As String Get Return Me._lastName End Get Set(ByVal value As String) Me._lastName = value End Set End Property ' Fields Private _firstName As String Private _lastName As String End Class
You can make the collection available for binding the same way you would with other common language runtime (CLR) objects, as described in How to: Make Data Available for Binding in XAML. For example, you can instantiate the collection in XAML and specify the collection as a resource, as shown here:
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:c="clr-namespace:SDKSample" x:Class="SDKSample.Window1" Width="400" Height="280" Title="MultiBinding Sample"> <Window.Resources> <c:NameList x:Key="NameListData"/> ... </Window.Resources>
You can then bind to the collection:
The definition of NameItemTemplate is not shown here.
The objects in your collection must satisfy the requirements described in the Binding Sources Overview. In particular, if you are using OneWay or TwoWay (for example, you want your UI to update when the source properties change dynamically), you must implement a suitable property changed notification mechanism such as the INotifyPropertyChanged interface.
For more information, see the Binding to Collections section in the Data Binding Overview.
|How to: Bind to a Collection and Display Information Based on Selection||In a simple master-detail scenario, you have a data-bound ItemsControl such as a ListBox. Based on user selection, you display more information about the selected item. This example shows how to implement this scenario.|
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.