对Silverlight中ObservableCollection自己的一点理解

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
//添加命名空间
using System.Collections.ObjectModel;
using System.ComponentModel;

namespace CatalogTest
{
public partial class ObservableCollectionVSList : UserControl
{
ObservableCollection<Student> students = new ObservableCollection<Student>();
//List<Student> students = new List<Student>();
Student selectedStudent = null;

public ObservableCollectionVSList()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(ObservableCollectionVSList_Loaded);
}

void ObservableCollectionVSList_Loaded(object sender, RoutedEventArgs e)
{
Student student1 = new Student() { StudentID = "001", StudentName = "张三" };
Student student2 = new Student() { StudentID = "002", StudentName = "李四" };
Student student3 = new Student() { StudentID = "003", StudentName = "王五" };
students.Add(student1);
students.Add(student2);
students.Add(student3);
//绑定
listBox1.ItemsSource = students;
listBox1.DisplayMemberPath = "StudentName";
//注册选择项事件
this.listBox1.SelectionChanged += new SelectionChangedEventHandler(listBox1_SelectionChanged);

}

void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
selectedStudent = this.listBox1.SelectedItem as Student;
}

//删除
private void btnDel_Click(object sender, RoutedEventArgs e)
{
if (selectedStudent != null)
{
students.Remove(selectedStudent);
}

}
//修改
private void btnEdit_Click(object sender, RoutedEventArgs e)
{
if (selectedStudent != null)
{
int myIndex = students.IndexOf(selectedStudent);
students[myIndex].StudentName = "我改名了！";
}
}
//添加
private void btnAdd_Click(object sender, RoutedEventArgs e)
{
Student student = new Student() { StudentID="009",StudentName="Joetao"};
students.Add(student);
}
}
public class Student
{
public string  StudentID { get; set; }
public string  StudentName { get; set; }
}

//分别采用 ObservableCollection<Student>与List<Student>作为绑定数据源
//当我们用List<T>作为数据源绑定UI控件时：当做增删改操作来修改students绑定数据源时，数据源都不能通知UI更新。
//当我们用ObservableCollection<T>作为数据绑定UI控件时：当做增删改操作来修改students绑定数据源时,Add()和Remove()操作修改的数据源能通知UI更新，而改操作不能更新UI.
//                               //这一点正说明了MSDN上对ObservableCollection<T>类介绍:"表示一个动态数据集合，在添加项、移除项或刷新整个列表时，此集合将提供通知。"

//我在处理这个问题理解偏差：
//在一开始的时候我对这句话：“实现您自己的集合之前，应考虑使用 ObservableCollection<T> 类，该类具有 INotifyCollectionChanged 和 INotifyPropertyChanged 的内置实现。“
//被我理解为了只要用了ObservableCollection<T>，这个类集合以及类集合中的所有成员属性就具有更改通知的功能，这个理解是错误。ObservableCollection<T>只是针对T类型而言，并非给予了
//类成员属性更改通知的功能，要想类成员属性具有更改UI功能还得让类继承INotifyPropertyChanged接口，并用 (NotifyCollectionChangedEventArgs) 的事件数据报告有关集合更改的特性的信息
}