INotifyCollectionChanged 未更新 UI

我有一堂课，如下所示。为了简洁起见，我删除了所有功能

public class PersonCollection:IList<Person>
{}

现在我又多了一个模型类，如下所示。 AddValueCommand 是从 ICommand 派生的类，我再次省略它。

public class DataContextClass:INotifyCollectionChanged
{
    private PersonCollection personCollection = PersonCollection.GetInstance();

    public IList<Person> ListOfPerson
    {
        get 
        {
            return personCollection;
        }            
    }

    public void AddPerson(Person person)
    {
        personCollection.Add(person);
        OnCollectionChanged(NotifyCollectionChangedAction.Reset);
    }


    public event NotifyCollectionChangedEventHandler CollectionChanged = delegate { };
    public void OnCollectionChanged(NotifyCollectionChangedAction action)
    {
        if (CollectionChanged != null)
        {
            CollectionChanged(this, new NotifyCollectionChangedEventArgs(action));
        }
    }       

    ICommand addValueCommand;

    public ICommand AddValueCommand
    {
        get
        {
            if (addValueCommand == null)
            {
                addValueCommand = new AddValueCommand(p => this.AddPerson(new Person { Name = "Ashish"}));
            }
            return addValueCommand;               
        }
    }
}

在主窗口中，我将 UI 绑定到模型，如下所示

 DataContextClass contextclass = new DataContextClass();           
 this.DataContext = new DataContextClass();

我的用户界面如下所示

<ListBox Margin="5,39,308,113" ItemsSource="{Binding Path=ListOfPerson}">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBox Height="20" Text="{Binding Path=Name}"></TextBox>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
    <Button Content="Button"  HorizontalAlignment="Left" Command="{Binding Path=AddValueCommand}" Margin="233,39,0,73" />

单击按钮时，我的列表框未使用新值进行更新。我在这里缺少什么。

INotifyCollectionChanged必须由集合类来实现。不是按班级含有集合。
你需要删除INotifyPropertyChanged from DataContextClass并将其添加到PersonCollection.