IListSource Interfaz

Definición

public interface class IListSource

public interface IListSource

[System.ComponentModel.TypeConverter("System.Windows.Forms.Design.DataSourceConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public interface IListSource

[System.ComponentModel.TypeConverter("System.Windows.Forms.Design.DataSourceConverter, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public interface IListSource

[System.ComponentModel.TypeConverter("System.Windows.Forms.Design.DataSourceConverter, System.Design, Version=2.0.5.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public interface IListSource

type IListSource = interface

Public Interface IListSource

Derivado

System.Data.DataSet

System.Data.DataTable

System.Data.Linq.EntitySet<TEntity>

System.Data.Linq.Table<TEntity>

System.Data.Objects.ObjectQuery

System.Data.Objects.ObjectQuery<T>

System.Data.Objects.ObjectResult

System.Data.Objects.DataClasses.EntityCollection<TEntity>

System.Web.UI.DataSourceControl

System.Web.UI.WebControls.SiteMapDataSource

System.Web.UI.WebControls.XmlDataSource

Atributos

TypeConverterAttribute TypeConverterAttribute TypeConverterAttribute

Ejemplos

En el ejemplo de código siguiente se muestra cómo implementar la interfaz IListSource.The following code example demonstrates how to implement the IListSource interface. Un componente denominado EmployeeListSource expone un IList para el enlace de datos mediante la implementación del método GetList.A component named EmployeeListSource exposes an IList for data binding by implementing the GetList method. Para obtener una lista de código completa, consulte Cómo: implementar la interfaz IListSource.For a full code listing, see How to: Implement the IListSource Interface.

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;

namespace IListSourceCS
{
    public class EmployeeListSource : Component, IListSource
    {
        public EmployeeListSource() {}

        public EmployeeListSource(IContainer container)
        {
            container.Add(this);
        }

        #region IListSource Members

        bool IListSource.ContainsListCollection
        {
            get { return false; }
        }

        System.Collections.IList IListSource.GetList()
        {
            BindingList<Employee>   ble = new BindingList<Employee>();

            if (!this.DesignMode)
            {
                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("Verebélyi, Ágnes", 15700000));
            }

            return ble;
        }

        #endregion
    }
}

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("Verebélyi, Ágnes", 15700000))
        End If

        Return ble

    End Function

#End Region

End Class

Comentarios

Normalmente, esta interfaz se utiliza para devolver una lista que se puede enlazar a un origen de datos, desde un objeto que no implementa IList mismo.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.

El enlace a los datos puede producirse en tiempo de ejecución o en un diseñador, pero hay reglas para cada uno.Binding to data can occur at either run time or in a designer, but there are rules for each. En tiempo de ejecución, puede enlazar a datos en cualquiera de los siguientes elementos:At run time, you can bind to data in any of the following:

• Array

• Implementador de IList, siempre que el implementador tenga una propiedad fuertemente tipada Item[] (es decir, el Type es todo pero Object).Implementer of IList, provided the implementer has a strongly typed Item[] property (that is, the Type is anything but Object). Para ello, puede hacer que la implementación predeterminada de Item[] privada.You can accomplish this by making the default implementation of Item[] private. Si desea crear una IList que siga las reglas de una colección fuertemente tipada, debe derivar de CollectionBase.If you want to create an IList that follows the rules of a strongly typed collection, you should derive from CollectionBase.

• Implementador de ITypedList.Implementer of ITypedList.

En un diseñador, puede inicializar el enlace a Component objetos siguiendo las mismas reglas.In a designer, you can initialize binding to Component objects by following the same rules.

Propiedades

Métodos

Se aplica a

Consulte también:

• IListSource
• ITypedList
• BindingList<T>
• IBindingList
• CollectionBase
• Enlace de datos y Windows FormsData Binding and Windows Forms