Windows Phone 7 - 取消选择嵌套列表框中的 ListBoxItem

Question

我有一个带有日期的列表框。
每个 ListBoxItem（日期）都有另一个包含该日期事件的 ListBox。

当我选择一个事件时，它会突出显示（SelectedIndex/SelectedItem），并且我导航到另一个数据透视表。这很好用。

我的问题是每个列表框都有它自己的 SelectedItem。我想从每个列表框中清除 SelectedItem，但我无法让它工作！

这是我的尝试：

    //Store a reference to the latest selected ListBox
    public ListBox SelectedListBox { get; set; }

    private void SelectionChangedHandler(object sender, SelectionChangedEventArgs e)
    {
        ListBox lstBox = ((ListBox)sender);

        //This row breaks the SECOND time!!
        var episode = (Episode)lstBox.SelectedItem;   

        episodeShowName.Text = episode.Show; //Do some code
        episodeTitle.Text = episode.Name; //Do some code
        episodeNumber.Text = episode.Number; //Do some code
        episodeSummary.Text = episode.Summary; //Do some code

        resetListBox(lstBox); //Do the reset !

        pivot1.SelectedIndex = 1;
    }


    private void resetListBox(ListBox lstBox)
    {
        if (SelectedListBox != null)
            SelectedListBox.SelectedIndex = -1;

        //If I remove this line, the code doesn't break anymore
        SelectedListBox = lstBox; //Set the current ListBox as reference
    }

var Episode 第二次为空。怎么会？

Answer 1

我发现问题了！

private void resetListBox(ListBox lstBox)
{
    if (SelectedListBox != null)
        SelectedListBox.SelectedIndex = -1;

    //If I remove this line, the code doesn't break anymore
    SelectedListBox = lstBox; //Set the current ListBox as reference
}

当我将先前选定的 ListBox 的 SelectedIndex 设置为 -1 时，SelectionChangedHandler 事件再次被触发（当然）并搞砸了！ :D

简单修复：

    private void SelectionChangedHandler(object sender, SelectionChangedEventArgs e)
    {
        ListBox lstBox = ((ListBox)sender);
        if (lstBox.SelectedIndex < 0)
            return;