Question

我试图获取所选项目的值并将其存储到变量中。

然后将列表框的选定索引重置为-1 ，以便当我导航回该页面时，列表框将不显示先前选择的任何内容。

以下是我的代码：

但是当所选索引重置为-1 时，它将在 sortedTimeListBox.Items [selectedIndexOfSchedule] .ToString（）;因为selectedIndexOfSchedule已变为-1 。

我想要的是获取价值并导航到下一页。索引-1只是重置列表框的选定值。

我该怎么做？

private void scheduleListBox_SelectionChanged_1(object sender, SelectionChangedEventArgs e)
{
        //Get the value of selected index in scheduleListBox
        int selectedIndexOfSchedule = scheduleListBox.SelectedIndex;

        if (sortedSelectedValue.Text == "")
        {
            string selectedValueText = sortedTimeListBox.Items[selectedIndexOfSchedule].ToString();
            MessageBox.Show("selectedValueText : " + sortedSelectedValue.Text);
        }
        else
        {
            MessageBox.Show("Empty");
        }

        NavigationService.Navigate(new Uri("/ViewScheduleDetails.xaml?selectedIndexOfSchedule=" + selectedIndexOfSchedule + "&selectedFolderName1=" + fullFolderName + "&passToDelete=" + selectedFolderName, UriKind.Relative));
        scheduleListBox.SelectedIndex = -1;

}

Answer 1

您可以添加一项检查，以查看该值是否为-1。

private void scheduleListBox_SelectionChanged_1(object sender, SelectionChangedEventArgs e)
{
    //Get the value of selected index in scheduleListBox
    int selectedIndexOfSchedule = scheduleListBox.SelectedIndex;

    if(selectedIndexOfSchedule != -1)
    {
        if (sortedSelectedValue.Text == "")
        {
            string selectedValueText = sortedTimeListBox.Items[selectedIndexOfSchedule].ToString();
            MessageBox.Show("selectedValueText : " + sortedSelectedValue.Text);
        }
        else
        {
            MessageBox.Show("Empty");
        }

        NavigationService.Navigate(new Uri("/ViewScheduleDetails.xaml?selectedIndexOfSchedule=" + selectedIndexOfSchedule + "&selectedFolderName1=" + fullFolderName + "&passToDelete=" + selectedFolderName, UriKind.Relative));
        scheduleListBox.SelectedIndex = -1;
    }

}

获取列表框的选定值并在C＃windows phone 7中重置所选索引值

1 个答案: