BindingSource 类 (System.Windows.Forms)

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public ref class BindingSource : System::ComponentModel::Component, System::Collections::IList, System::ComponentModel::IBindingListView, System::ComponentModel::ICancelAddNew, System::ComponentModel::ISupportInitializeNotification, System::ComponentModel::ITypedList, System::Windows::Forms::ICurrencyManagerProvider

public ref class BindingSource : System::ComponentModel::Component, System::Collections::IList, System::ComponentModel::IBindingListView, System::ComponentModel::ICancelAddNew, System::ComponentModel::ISupportInitialize, System::ComponentModel::ISupportInitializeNotification, System::ComponentModel::ITypedList, System::Windows::Forms::ICurrencyManagerProvider

[System.ComponentModel.ComplexBindingProperties("DataSource", "DataMember")]
public class BindingSource : System.ComponentModel.Component, System.Collections.IList, System.ComponentModel.IBindingListView, System.ComponentModel.ICancelAddNew, System.ComponentModel.ISupportInitializeNotification, System.ComponentModel.ITypedList, System.Windows.Forms.ICurrencyManagerProvider

[System.ComponentModel.ComplexBindingProperties("DataSource", "DataMember")]
public class BindingSource : System.ComponentModel.Component, System.Collections.IList, System.ComponentModel.IBindingListView, System.ComponentModel.ICancelAddNew, System.ComponentModel.ISupportInitialize, System.ComponentModel.ISupportInitializeNotification, System.ComponentModel.ITypedList, System.Windows.Forms.ICurrencyManagerProvider

[<System.ComponentModel.ComplexBindingProperties("DataSource", "DataMember")>]
type BindingSource = class
    inherit Component
    interface IBindingListView
    interface IBindingList
    interface IList
    interface ICollection
    interface IEnumerable
    interface ITypedList
    interface ICancelAddNew
    interface ISupportInitializeNotification
    interface ISupportInitialize
    interface ICurrencyManagerProvider

[<System.ComponentModel.ComplexBindingProperties("DataSource", "DataMember")>]
type BindingSource = class
    inherit Component
    interface IBindingListView
    interface ICollection
    interface IEnumerable
    interface IList
    interface IBindingList
    interface ITypedList
    interface ICancelAddNew
    interface ISupportInitializeNotification
    interface ISupportInitialize
    interface ICurrencyManagerProvider

Public Class BindingSource
Inherits Component
Implements IBindingListView, ICancelAddNew, ICurrencyManagerProvider, IList, ISupportInitializeNotification, ITypedList

Public Class BindingSource
Inherits Component
Implements IBindingListView, ICancelAddNew, ICurrencyManagerProvider, IList, ISupportInitialize, ISupportInitializeNotification, ITypedList

Object

MarshalByRefObject

Component

BindingSource

下面的代码示例演示 ListBox 了绑定到 a BindingSource . 绑定到 BindingSource 一个 BindingList<T> 包含字体列表的字体。


   using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace BindingSourceExamples
    public class Form1 : Form
        [STAThread]
        static void Main()
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        public Form1()
            this.Load += new EventHandler(Form1_Load);
        private TextBox textBox1;
        private Button button1;
        private ListBox listBox1;
        private BindingSource binding1;
        void Form1_Load(object sender, EventArgs e)
            listBox1 = new ListBox();
            textBox1 = new TextBox();
            binding1 = new BindingSource();
            button1 = new Button();
            listBox1.Location = new Point(140, 25);
            listBox1.Size = new Size(123, 160);
            textBox1.Location = new Point(23, 70);
            textBox1.Size = new Size(100, 20);
            textBox1.Text = "Wingdings";
            button1.Location = new Point(23, 25);
            button1.Size = new Size(75, 23);
            button1.Text = "Search";
            button1.Click += new EventHandler(this.button1_Click);
            this.ClientSize = new Size(292, 266);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.listBox1);
            MyFontList fonts = new MyFontList();
            for (int i = 0; i < FontFamily.Families.Length; i++)
                if (FontFamily.Families[i].IsStyleAvailable(FontStyle.Regular))
                    fonts.Add(new Font(FontFamily.Families[i], 11.0F, FontStyle.Regular));
            binding1.DataSource = fonts;
            listBox1.DataSource = binding1;
            listBox1.DisplayMember = "Name";
        private void button1_Click(object sender, EventArgs e)
            if (binding1.SupportsSearching != true)
                MessageBox.Show("Cannot search the list.");
                int foundIndex = binding1.Find("Name", textBox1.Text);
                if (foundIndex > -1)
                    listBox1.SelectedIndex = foundIndex;
                    MessageBox.Show("Font was not found.");
    public class MyFontList : BindingList<Font>
        protected override bool SupportsSearchingCore
            get { return true; }
        protected override int FindCore(PropertyDescriptor prop, object key)
            // Ignore the prop value and search by family name.
            for (int i = 0; i < Count; ++i)
                if (Items[i].FontFamily.Name.ToLower() == ((string)key).ToLower())
                    return i;
            return -1;
   
    Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Public Class Form1
    Inherits Form
    <STAThread()> _
    Shared Sub Main()
        Application.EnableVisualStyles()
        Application.Run(New Form1())
    End Sub
    Public Sub New()
    End Sub
    Private textBox1 As TextBox
    Private WithEvents button1 As Button
    Private listBox1 As ListBox
    Private components As IContainer
    Private binding1 As BindingSource
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        listBox1 = New ListBox()
        textBox1 = New TextBox()
        binding1 = New BindingSource()
        button1 = New Button()
        listBox1.Location = New Point(140, 25)
        listBox1.Size = New Size(123, 160)
        textBox1.Location = New Point(23, 70)
        textBox1.Size = New Size(100, 20)
        textBox1.Text = "Wingdings"
        button1.Location = New Point(23, 25)
        button1.Size = New Size(75, 23)
        button1.Text = "Search"
        Me.ClientSize = New Size(292, 266)
        Me.Controls.Add(Me.button1)
        Me.Controls.Add(Me.textBox1)
        Me.Controls.Add(Me.listBox1)
        Dim fonts As New MyFontList()
        Dim i As Integer
        For i = 0 To FontFamily.Families.Length - 1
            If FontFamily.Families(i).IsStyleAvailable(FontStyle.Regular) Then
                fonts.Add(New Font(FontFamily.Families(i), 11.0F, FontStyle.Regular))
            End If
        Next i
        binding1.DataSource = fonts
        listBox1.DataSource = binding1
        listBox1.DisplayMember = "Name"
    End Sub
    Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) _
        Handles button1.Click
        If binding1.SupportsSearching <> True Then
            MessageBox.Show("Cannot search the list.")
            Dim foundIndex As Integer = binding1.Find("Name", textBox1.Text)
            If foundIndex > -1 Then
                listBox1.SelectedIndex = foundIndex
                MessageBox.Show("Font was not found.")
            End If
        End If
    End Sub
End Class
Public Class MyFontList
    Inherits BindingList(Of Font)
    Protected Overrides ReadOnly Property SupportsSearchingCore() As Boolean
            Return True
        End Get
    End Property
    Protected Overrides Function FindCore(ByVal prop As PropertyDescriptor, _
        ByVal key As Object) As Integer
        ' Ignore the prop value and search by family name.
        Dim i As Integer
        While i < Count
            If Items(i).FontFamily.Name.ToLower() = CStr(key).ToLower() Then
                Return i
            End If
            i += 1
        End While
        Return -1
    End Function
End Class
    
     该
     
      BindingSource
     
     组件有多种用途。 首先，它通过在Windows 窗体控件和数据源之间提供货币管理、更改通知和其他服务来简化对表单的绑定控件。 这是通过使用属性将
     
      BindingSource
     
     组件附加到数据源来实现的
     
      DataSource
     
     。 对于复杂的绑定方案，可以选择将
     
      DataMember
     
     属性设置为数据源中的特定列或列表。 然后将控件绑定到 .
     
      BindingSource
     
     与数据进行的所有进一步交互都是通过对组件的调用完成的
     
      BindingSource
     
     。 有关如何简化绑定过程的示例
     
      BindingSource
     
     ，请参阅
     
      如何：将Windows 窗体控件绑定到 DBNull 数据库值
     
     
      以及如何：处理数据绑定发生的错误和异常
     
     。 数据源的导航和更新是通过方法完成的，
     
      MoveLast
     
     例如
     
      MoveNext
     
     ，和
     
      Remove
     
     。 排序和筛选等操作通过
     
      Sort
     
     属性
     
      Filter
     
     进行处理。 For more information on using sorting and filtering with the
     
      BindingSource
     
     , see
     
      How to: Sort and Filter ADO.NET Data with the Windows Forms BindingSource Component
     
     .
    
    
     此外，
     
      BindingSource
     
     组件还可以充当强类型数据源。 通常，基础数据源的类型通过以下机制之一进行修复：
    
    
     
      
       Add
      
      使用该方法将项添加到
      
       BindingSource
      
      组件。
     
    
    
     
      将
      
       DataSource
      
      属性设置为列表、单个对象或类型。
     
     
      这两种机制都创建强类型列表。 有关如何使用
      
       BindingSource
      
      绑定到类型的详细信息，请参阅
      
       如何：将Windows 窗体控件绑定到类型
      
      。 还可以使用该
      
       BindingSource
      
      控件将控件绑定到工厂对象。 有关如何执行此操作的详细信息，请参阅
      
       如何：将Windows 窗体控件绑定到工厂对象
      
      。
     
     
      由于处理
      
       BindingSource
      
      简单和复杂的数据源，因此术语有问题。 在此类文档中，术语
      
       列表
      
      引用托管数据源中的数据收集，
      
       而项
      
      表示单个元素。 讨论与复杂数据源关联的功能时，将使用等效的术语
      
       表
      
      和
      
       行
      
      。
     
     
      
       BindingSource
      
      提供用于访问基础数据的成员。 可以通过属性检索
      
       Current
      
      当前项，并且可以通过属性检索
      
       List
      
      整个列表。 当前项
      
       Current
      
      
       RemoveCurrent
      
      
       CancelEdit
      
      
       EndEdit
      
      以及  和
      
       Add
      
      
       AddNew
      
      方法支持编辑操作。 尽管为所有基础数据源类型自动处理货币管理，但此类公开了许多事件，例如
      
       CurrentItemChanged
      
      ，允许
      
       DataSourceChanged
      
      自定义的事件。
     
     
      还可以使用
      
       BindingNavigator
      
      类导航和管理绑定到
      
       BindingSource
      
      组件的数据源，该类提供类似于 VCR 的用户界面 (UI) ，用于在列表中导航项。 虽然
      
       BindingNavigator
      
      可以绑定到任何数据源，但它旨在通过组件的属性
      
       BindingNavigator.BindingSource
      
      与
      
       BindingSource
      
      组件集成。
     
     
      类的默认属性
      
       BindingSource
      
      为
      
       DataSource
      
      . 默认事件为
      
       CurrentChanged
      
      .
     
     
      类的许多成员
      
       BindingSource
      
      对属性表示
      
       List
      
      的基础列表进行操作，只需将其操作引用基础列表即可。 因此，当绑定到自定义实现
      
       IList
      
      时
      
       BindingSource
      
      ，这些成员的确切行为可能与类文档中所述的行为不同。 例如，
      
       RemoveAt
      
      方法调用
      
       IList.RemoveAt
      
      。 文档
      
       BindingSource
      
      介绍了该方法
      
       RemoveAt
      
      ，并了解
      
       RemoveAt
      
      基础
      
       IList
      
      的方法是否正确实现。