IListSource Rozhraní

Definice

Poskytuje funkce objektu, který vrátí seznam, který může být svázán se zdrojem dat.Provides functionality to an object to return a list that can be bound to a data source.

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
[<System.ComponentModel.TypeConverter("System.Windows.Forms.Design.DataSourceConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]
type IListSource = interface
[<System.ComponentModel.TypeConverter("System.Windows.Forms.Design.DataSourceConverter, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]
type IListSource = interface
[<System.ComponentModel.TypeConverter("System.Windows.Forms.Design.DataSourceConverter, System.Design, Version=2.0.5.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]
type IListSource = interface
Public Interface IListSource
Odvozené
Atributy

Příklady

Následující příklad kódu ukazuje, jak implementovat IListSource rozhraní.The following code example demonstrates how to implement the IListSource interface. Komponenta s názvem EmployeeListSource zveřejňuje IList pro datovou vazbu implementací GetList metody.A component named EmployeeListSource exposes an IList for data binding by implementing the GetList method. Úplný výpis kódu naleznete v tématu How to: Implementing the IListSource Interface.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

Poznámky

Toto rozhraní se obvykle používá k vrácení seznamu, který může být svázán se zdrojem dat, z objektu, který sám o sobě neimplementuje IList .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.

Vazba na data se může vyskytnout buď v době běhu, nebo v návrháři, ale existují pravidla pro každé z nich.Binding to data can occur at either run time or in a designer, but there are rules for each. V době spuštění se můžete připojit k datům v některém z následujících možností:At run time, you can bind to data in any of the following:

  • Array

  • Implementátor – IList za předpokladu, že má implementátor vlastnost silného typu Item[] (to znamená, že Type je to cokoli, ale Object ).Implementer of IList, provided the implementer has a strongly typed Item[] property (that is, the Type is anything but Object). To můžete provést tak, že nastavíte výchozí implementaci Item[] Private.You can accomplish this by making the default implementation of Item[] private. Chcete-li vytvořit objekt IList , který následuje pravidla pro kolekci silného typu, je třeba odvozovat z CollectionBase .If you want to create an IList that follows the rules of a strongly typed collection, you should derive from CollectionBase.

  • Implementátor ITypedList .Implementer of ITypedList.

V Návrháři můžete inicializovat vazbu na Component objekty pomocí stejných pravidel.In a designer, you can initialize binding to Component objects by following the same rules.

Poznámka

Implementátori IListSource mohou vracet objekt IList , který obsahuje kolekci IList objektů.Implementers of IListSource can return an IList that contains a collection of IList objects.

Vlastnosti

ContainsListCollection

Načte hodnotu, která označuje, zda je kolekce kolekcí IList objektů.Gets a value indicating whether the collection is a collection of IList objects.

Metody

GetList()

Vrátí IList objekt, který může být svázán se zdrojem dat z objektu, který neimplementuje IList sám sebe.Returns an IList that can be bound to a data source from an object that does not implement an IList itself.

Platí pro

Viz také