Provides functionality to an object to return a list that can be bound to a data source.
Assembly: System (in System.dll)
You typically use this interface to return a list that can be bound to a data source, from an object that does not implement IList itself.
Binding to data can occur at either run time or in a designer, but there are rules for each. At run time, you can bind to data in any of the following:
Implementer of IList, provided the implementer has a strongly typed Item property (that is, the Type is anything but Object). You can accomplish this by making the default implementation of Item private. If you want to create an IList that follows the rules of a strongly typed collection, you should derive from CollectionBase.
Implementer of ITypedList.
In a designer, you can initialize binding to Component objects by following the same rules.
The following code example demonstrates how to implement the EmployeeListSource exposes an IList for data binding by implementing the GetList method. For a full code listing, see How to: Implement the IListSource Interface.interface. A component named
Imports System.ComponentModel Public Class EmployeeListSource Inherits Component Implements IListSource <System.Diagnostics.DebuggerNonUserCode()> _ Public Sub New(ByVal Container As System.ComponentModel.IContainer) MyClass.New() 'Required for Windows.Forms Class Composition Designer support Container.Add(Me) End Sub <System.Diagnostics.DebuggerNonUserCode()> _ Public Sub New() MyBase.New() 'This call is required by the Component Designer. InitializeComponent() End Sub 'Component overrides dispose to clean up the component list. <System.Diagnostics.DebuggerNonUserCode()> _ Protected Overrides Sub Dispose(ByVal disposing As Boolean) If disposing AndAlso components IsNot Nothing Then components.Dispose() End If MyBase.Dispose(disposing) End Sub 'Required by the Component Designer Private components As System.ComponentModel.IContainer 'NOTE: The following procedure is required by the Component Designer 'It can be modified using the Component Designer. 'Do not modify it using the code editor. <System.Diagnostics.DebuggerStepThrough()> _ Private Sub InitializeComponent() components = New System.ComponentModel.Container() End Sub #Region "IListSource Members" Public ReadOnly Property ContainsListCollection() As Boolean Implements System.ComponentModel.IListSource.ContainsListCollection Get Return False End Get End Property Public Function GetList() As System.Collections.IList Implements System.ComponentModel.IListSource.GetList Dim ble As New BindingList(Of Employee) If Not Me.DesignMode Then ble.Add(New Employee("Aaberg, Jesper", 26000000)) ble.Add(New Employee("Cajhen, Janko", 19600000)) ble.Add(New Employee("Furse, Kari", 19000000)) ble.Add(New Employee("Langhorn, Carl", 16000000)) ble.Add(New Employee("Todorov, Teodor", 15700000)) ble.Add(New Employee("Vereb�lyi, �gnes", 15700000)) End If Return ble End Function #End Region End Class
Available since 1.1