微软在2.0增加BindingList并实现了IbindingList
面向对象中集合类一般都会实现接口IbindingList, 因为 ，在绑定数据源的时候，如果数据源实现了IbindingList 那么界面可以与之实行互动。无意中发现了微软在2.0增加了一个新类，BindingList<T>，这个类从Collection<T>断承，并实现了IbindingList.
IbindingList 的魅力之处就在于他有AddNew，ApplySort，ListChangedEventHandler 等方法。而BindingSource 是控件的数据源和真正的数据源之间的桥梁，它可以调用IbindingList 的数AddNew等方法。同时IbindingList有数据发生改变的时候又会通知BindingSource从而更新界面。
MS 的 BindingList<T>还不支持sort ,search.,这是因为不知T为何东东有关系，要想实现些功能只有自己扩展了。BindingList<T>有点遗憾的是没有记下删除的数据，这与功能强大的表还是无法相比。从面向对象都已经到面向方面了，怎么在基础类中对面向对象支持还是不太完美呢。现在在研究，对象实体，集合，欢迎各位大师前来指教。
下面是MSDN上对BindingListr 的说明，代码示例演示如何绑定到一个包含业务对象的 BindingList 组件。
http://msdn2.microsoft.com/zh-cn/library/ms132679.aspx#Mtps_DropDownFilterTextBindingList 类可以用作创建双向数据绑定机制的基类。BindingList 提供 IBindingList 接口的具体泛型实现。这样就不必实现完整的 IBindingList 接口，实现完整接口可能会因 IBindingList、IEditableObject 和关联的 CurrencyManager 之间微妙的交互而变得比较困难。不过，典型的解决方案程序员将使用提供数据绑定功能的类（如 BindingSource），而不是直接使用 BindingList。
BindingList 通过可扩展的 AddNew 方法支持工厂创建的实例。（在 BindingSource 等其他类中也存在这种类型的扩展性）此外，由于此类实现 ICancelAddNew 接口，因此它通过 EndNew 和 CancelNew 方法实现新项的事务性提交或回滚。
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注意 |
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应用于此类的 HostProtectionAttribute 属性 (attribute) 拥有以下 Resources 属性 (property) 值：SharedState。HostProtectionAttribute 不影响桌面应用程序（这些应用程序通常通过双击图标、键入命令或在浏览器中输入 URL 来启动）。有关更多信息，请参见 HostProtectionAttribute 类或 SQL Server 编程和宿主保护属性。 |
using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Text;using System.Windows.Forms;namespace BindingListOfTExamples
{
public partial class Form1 : Form
{
private TextBox textBox2; private ListBox listBox1; private Button button1; private TextBox textBox1; Random randomNumber = new Random(); public Form1() { this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.textBox1 = new System.Windows.Forms.TextBox(); this.textBox2 = new System.Windows.Forms.TextBox(); this.listBox1 = new System.Windows.Forms.ListBox(); this.button1 = new System.Windows.Forms.Button(); this.textBox1.Location = new System.Drawing.Point(169, 26); this.textBox1.Size = new System.Drawing.Size(100, 20); this.textBox1.Text = "Bracket"; this.textBox2.Location = new System.Drawing.Point(169, 57); this.textBox2.ReadOnly = true; this.textBox2.Size = new System.Drawing.Size(100, 20); this.textBox2.Text = "4343"; this.listBox1.FormattingEnabled = true; this.listBox1.Location = new System.Drawing.Point(12, 12); this.listBox1.Size = new System.Drawing.Size(120, 95); this.button1.Location = new System.Drawing.Point(180, 83); this.button1.Size = new System.Drawing.Size(75, 23); this.button1.Text = "Add New Item"; this.button1.Click += new System.EventHandler(this.button1_Click); this.ClientSize = new System.Drawing.Size(292, 266); this.Controls.Add(this.button1); this.Controls.Add(this.listBox1); this.Controls.Add(this.textBox2); this.Controls.Add(this.textBox1); this.Text = "Parts Form"; this.Load += new EventHandler(Form1_Load); 
} void Form1_Load(object sender, EventArgs e) { InitializeListOfParts(); listBox1.DataSource = listOfParts; listBox1.DisplayMember = "PartName"; listOfParts.AddingNew += new AddingNewEventHandler(listOfParts_AddingNew); listOfParts.ListChanged += new ListChangedEventHandler(listOfParts_ListChanged); } // Declare a new BindingListOfT with the Part business object. BindingList<Part> listOfParts; private void InitializeListOfParts() { // Create the new BindingList of Part type. listOfParts = new BindingList<Part>(); // Allow new parts to be added, but not removed once committed. listOfParts.AllowNew = true; listOfParts.AllowRemove = false; // Raise ListChanged events when new parts are added. listOfParts.RaiseListChangedEvents = true; // Do not allow parts to be edited. listOfParts.AllowEdit = false; // Add a couple of parts to the list. listOfParts.Add(new Part("Widget", 1234)); listOfParts.Add(new Part("Gadget", 5647)); } // Create a new part from the text in the two text boxes. void listOfParts_AddingNew(object sender, AddingNewEventArgs e) { e.NewObject = new Part(textBox1.Text, int.Parse(textBox2.Text)); } // Add the new part unless the part number contains // spaces. In that case cancel the add. private void button1_Click(object sender, EventArgs e) { Part newPart = listOfParts.AddNew(); if (newPart.PartName.Contains(" ")) { MessageBox.Show("Part names cannot contain spaces."); listOfParts.CancelNew(listOfParts.IndexOf(newPart)); } else { textBox2.Text = randomNumber.Next(9999).ToString(); textBox1.Text = "Enter part name"; } } void listOfParts_ListChanged(object sender, ListChangedEventArgs e) { MessageBox.Show(e.ListChangedType.ToString()); } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Form1()); } } // A simple business object for example purposes. public class Part { private string name; private int number; public Part() { } public Part(string nameForPart, int numberForPart) { PartName = nameForPart; PartNumber = numberForPart; } public string PartName { get { return name; } set { name = value; } } public int PartNumber { get { return number; } set { number = value; } } }
}