ITypedList 接口

定义

提供发现可绑定列表架构的功能,其中可用于绑定的属性不同于要绑定到的对象的公共属性。

public interface class ITypedList
public interface ITypedList
type ITypedList = interface
Public Interface ITypedList
派生

示例

以下代码示例演示如何实现 ITypedList 接口。 名为 SortableBindingList 的泛型类型派生于 BindingList<T> 类并实现 ITypedList 接口。 有关完整代码列表,请参阅 如何:实现 ITypedList 接口

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Windows.Forms;
using System.Collections;
using System.Reflection;

namespace ITypedListCS
{
    [Serializable()]
    public class SortableBindingList<T> : BindingList<T>, ITypedList
    {
        [NonSerialized()]
        private PropertyDescriptorCollection properties;

        public SortableBindingList() : base()
        {
            // Get the 'shape' of the list. 
            // Only get the public properties marked with Browsable = true.
            PropertyDescriptorCollection pdc = TypeDescriptor.GetProperties(
                typeof(T), 
                new Attribute[] { new BrowsableAttribute(true) });

            // Sort the properties.
            properties = pdc.Sort();
        }

        #region ITypedList Implementation

        public PropertyDescriptorCollection GetItemProperties(PropertyDescriptor[] listAccessors)
        {
            PropertyDescriptorCollection pdc;

            if (listAccessors!=null && listAccessors.Length>0)
            {
                // Return child list shape.
                pdc = ListBindingHelper.GetListItemProperties(listAccessors[0].PropertyType);
            }
            else
            {
                // Return properties in sort order.
                pdc = properties;
            }

            return pdc;
        }

        // This method is only used in the design-time framework 
        // and by the obsolete DataGrid control.
        public string GetListName(PropertyDescriptor[] listAccessors)
        {   
            return typeof(T).Name;
        }

        #endregion
    }
}
Imports System.ComponentModel
Imports System.Collections.Generic
Imports System.Windows.Forms

<Serializable()> _
Public Class SortableBindingList(Of Tkey)
    Inherits BindingList(Of Tkey)
    Implements ITypedList

    <NonSerialized()> _
    Private properties As PropertyDescriptorCollection

    Public Sub New()
        MyBase.New()

        ' Get the 'shape' of the list. 
        ' Only get the public properties marked with Browsable = true.
        Dim pdc As PropertyDescriptorCollection = TypeDescriptor.GetProperties(GetType(Tkey), New Attribute() {New BrowsableAttribute(True)})

        ' Sort the properties.
        properties = pdc.Sort()

    End Sub

#Region "ITypedList Implementation"

    Public Function GetItemProperties(ByVal listAccessors() As System.ComponentModel.PropertyDescriptor) As System.ComponentModel.PropertyDescriptorCollection Implements System.ComponentModel.ITypedList.GetItemProperties

        Dim pdc As PropertyDescriptorCollection

        If (Not (listAccessors Is Nothing)) And (listAccessors.Length > 0) Then
            ' Return child list shape
            pdc = ListBindingHelper.GetListItemProperties(listAccessors(0).PropertyType)
        Else
            ' Return properties in sort order
            pdc = properties
        End If

        Return pdc

    End Function

    ' This method is only used in the design-time framework 
    ' and by the obsolete DataGrid control.
    Public Function GetListName( _
    ByVal listAccessors() As PropertyDescriptor) As String _
    Implements System.ComponentModel.ITypedList.GetListName

        Return GetType(Tkey).Name

    End Function

#End Region

End Class

注解

例如,如果使用的是DataView表示customer表的 对象,则使用此接口,而想要绑定到 所表示的对象DataView上的customer属性,而不是 的 属性DataView

设计时支持可绑定列表不需要此接口。

绑定到数据可以在运行时或在设计器中发生,但两者都有规则。 在运行时,可以绑定到以下任一项中的数据:

在设计器中,可以通过遵循相同的规则来初始化绑定到 Component 对象。

有关绑定到数据源的详细信息,请参阅 System.Windows.Forms.Binding 类。

方法

GetItemProperties(PropertyDescriptor[])

返回 PropertyDescriptorCollection,其表示每一项上用于绑定数据的属性。

GetListName(PropertyDescriptor[])

返回列表名称。

适用于

另请参阅