Binding and INotifyPropertyChanged

我试图使用INotifyPropertyChanged事件绑定TextBlock。但是它没有向TextBlock更新任何东西。TextBlock为空。我的目标是更新显示在不同行的项的状态。我需要根据状态更新TextBlock的文字和颜色。

谁能告诉我我的代码有什么问题?

public class ItemStatus : INotifyPropertyChanged
{
    string itemStatus;
    Brush itemStatusColor;
    public string ItemStatus
    {
        get { return itemStatus; }
        set
        {
            itemStatus = value;
            this.OnPropertyChanged("ItemStatus");
        }
    }
    public Brush ItemStatusColor
    {
        get { return itemStatusColor; }
        set
        {
            itemStatusColor = value;
            this.OnPropertyChanged("ItemStatusColor");
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    void OnPropertyChanged(string propName)
    {
        if (this.PropertyChanged != null)
            this.PropertyChanged(
                this, new PropertyChangedEventArgs(propName));
    }
}
public class Items
{
    List<ItemStatus> currentItemStatus;
    public List<ItemStatus> CurrentItemStatus
    {
        get { return currentItemStatus; }
        set { currentItemStatus = value; }
    }
}
public partial class DisplayItemStatus : Page
{
    ....
    ....
    public DisplayItemStatus()
    {
        foreach (Product product in lstProductList)
        {
            TextBlock tbItemStatus = new TextBlock();
            ....
            Items objItems = new Items();
            Binding bindingText = new Binding();
            bindingText.Source = objItems;
            bindingText.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            bindingText.Path = new PropertyPath(String.Format("ItemStatus"));
            tbItemStatus.SetBinding(TextBlock.TextProperty, bindingText);
            Binding bindingColor = new Binding();
            bindingColor.Source = objItems;
            bindingColor.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            bindingColor.Path = new PropertyPath(String.Format("ItemStatusColor"));
            tbItemStatus.SetBinding(TextBlock.ForegroundProperty, bindingColor);
            grdItemsList.Children.Add(tbItemStatus);
        }
    }
    private void UpdateItems_Click(object sender, MouseButtonEventArgs e)
    {
        int intCount = 0;
        List<Product> ProductList = new List<Product>();
        List<ItemStatus> ItemList = new List<ItemStatus>();
        ProductList = GetProducts();
        foreach (Product product in ProductList)
        {
            intCount++;
            UpdateStatus(intCount, ItemList);
        }
    }
    public void UpdateStatus(int intIndex, List<ItemStatus> ItemList)
    {
        ItemStatus status = new ItemStatus();
        status.ItemStatus = strOperationStatus;
        status.ItemStatusColor = brshForegroundColor;
        ItemList.Add(status);
    }
}