用mvvm模式实现动态的pivotitem加载

[半个程序猿]

我的目的是pivotitem数量是动态确定的，写好之后发现不能工作，代码如下：
viewmodel类：

public class ViewModel
    {
        private ObservableCollection<TestPivot> _bindData;

        public ObservableCollection<TestPivot> BindData
        {
            get
            {
                return _bindData;
            }
            set
            {
                if (value != _bindData)
                {
                    _bindData = value;
                    
                }
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifiPropertyChanged(string bindData)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (null != handler)
            {
                handler(this,new PropertyChangedEventArgs(bindData));
            }
        }

        public void AddData(int size)
        {
            BindData=new ObservableCollection<TestPivot>();
            for (int i = 0; i < size; i++)
            {
                TestPivot t = new TestPivot();
                t.Name = "piovt item" + i;
                t.ListData = new List<string>();
                for (int j = 0; j < 10; j++)
                {
                    t.ListData.Add("List item" + j);
                }
                BindData.Add(t);
            }

        }
    }

TestPivot类：

public class TestPivot
    {
        public string Name { get; set; }

        public List<string> ListData { get; set; }
    }

MainPage.xaml:

<phone:PhoneApplicationPage
    x:Class="Demo.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DataContext="{d:DesignData SampleData/MainViewModelSampleData.xaml}"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait"  Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <phone:PhoneApplicationPage.Resources>
        <DataTemplate x:Key="DT_pivot">
            <ListBox ItemsSource="{Binding ListData}">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding}" />
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </DataTemplate>
        <DataTemplate x:Key="DT_Header">
            <TextBlock Text="{Binding Name}" />
        </DataTemplate>
    </phone:PhoneApplicationPage.Resources>
    <!--LayoutRoot 是包含所有页面内容的根网格-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <phone:Pivot Title="我的应用程序"
                     ItemsSource="{Binding BindData}"
                     ItemTemplate="{StaticResource DT_pivot}"
                     HeaderTemplate="{StaticResource DT_Header}">            
        </phone:Pivot>       
    </Grid>
</phone:PhoneApplicationPage>

[半个程序猿]

今天刚接触mvvm，不是特别明白原理，请各位帮忙debug一下

[半个程序猿]

ViewModel中有个INotifyPropertyChanged接口忘记继承了，但还是不行

[半个程序猿]

求大神解救啊

[gnimgnot]

PivotItem是依赖属性吗？