WP8 LongListSelector - 重新分配ItemsSource无效

Question

我正在使用新的Windows Phone 8 LongListSelector控件,它将其ItemsControl分配给a List<Group<object>>:

    List<Group<PlacePoint>> searchResults; 

    async void doSearch()
    {
        this.searchResults = await SearchHelper.Instance.getSearchResults(txtSearchTerm.Text);
        longList.ItemsSource = this.searchResults;
    }

不幸的是,我第二次搜索时,重新设置.ItemsSource属性没有任何效果,控件只显示旧的List.

如何更改绑定？

Answer 1

似乎重新分配longList.ItemsSource没有任何影响,无论这是一个错误还是我不能说的设计.

但是,一个简单的解决方法是简单地使用ObservableCollection>然后使用此集合而不是重新分配ItemsSource.

示例代码:

    ObservableCollection<Group<PlacePoint>> searchResults = new ObservableCollection<Group<PlacePoint>>();


    public SearchPage()
    {
        InitializeComponent();

        longList.ItemsSource = this.searchResults;
    }

    async void doSearch()
    {
        List<Group<PlacePoint>> tempResults = await SearchHelper.Instance.getSearchResults(txtSearchTerm.Text);

        // Clear existing collection and re-add new results
        this.searchResults.Clear();
        foreach (Group<PlacePoint> grp in tempResults )
        {
            this.searchResults.Add(grp);
        }
    }